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VB6 - RTBCompose RTF Editor UserControl

April 3, 2013, 11:11 pm
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Sometimes you want to provide a RichTextBox control wrapped with some buttons and logic to let the user interact with it as a somewht fuller-featured editor for RTF data. This is easy enough but a little tedious to do over and over again.

RTBCompose is a UserControl for this which you can add to your Projects and drop into your Forms. It helps keep the fiddly button handling logic out of your Forms and away from your business logic.

Uses

The attached demo is a small Project using RTBCompose to create a sort of stripped-down WordPad like program.

A more practical use might be programs that let a user compose and send RTF messages. This is why the SendButton option exists in RTBCompose.

You may also have a database that contains RTF-format Memo fields that you need users to be able to enter text into and/or edit existing text.

What it adds

RTBCompose provides a simple button bar supporting common rich editing operations such as cut, copy, paste, bold, etc.

It also adds a font/color "picker" based on the Font Common Dialog (ChooseFont API) wrapped in a way that makes it "work like" the VB6 CommonDialog control.

And it also has a button for "insert picture."

It adds Ctrl-B, Ctrl-I, and Ctrl-U keystrokes in addition to the Ctrl-C, Ctrl-V, and Ctrl-X natively supported by the RichTextBox control. Users get used to these in other programs and get to expect them.

There are other misc. features such as a left-right Margins property, a SendClicked event linked to the Send button you may not need, an IsDirty property and IsDirtyChanged event useful for adjusting things like menu item enabled status in the parent Form and detecting unsaved changes.

What it subtracts

RTBCompose only exposes a few things like the RichTextBox's base Font, Text, and RTFText properties and the LoadFile and SaveFile methods. It already takes care of most of the Selxxx properties with its own code, so you generally would not need them in the parent Form.

Since you have the full source you could expose more properties, add or remove buttons, implement drag/drop, etc. as required.

System Requirements

Should pretty much work on any system that VB6 programs run on.
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new pause funchion

April 13, 2013, 10:23 am
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Code:
Private Sub TimeOut(HowLong)
    Dim TheBeginning
    Dim NoFreeze As Integer
    TheBeginning = Timer


    Do
        If Timer - TheBeginning >= HowLong Then Exit Sub
        NoFreeze% = DoEvents()
    Loop
End Sub

use
TimeOut 4
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VB6 Unexpected Error on Windows 7

April 16, 2013, 12:49 am
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A forms-based VB6 application that runs on XP and Windows Server 2003 fails on Windows 7 with "Unexpected Error", even before the first form is launched.

(I will be answering myself as I've just solved it. I just wanted to pass on the knowledge)
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[RESOLVED] VB6 Unexpected Error on Windows 7

April 16, 2013, 12:49 am
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A forms-based VB6 application that runs on XP and Windows Server 2003 fails on Windows 7 with "Unexpected Error", even before the first form is launched.

(I will be answering myself as I've just solved it. I just wanted to pass on the knowledge)
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How to Check the internet connections adapters list?

April 17, 2013, 2:01 am
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Hello :wave:
I have 2 internet connection on my pc, where one is broad-band connection "Local Area Connection" and another is a dial-up connection "Idea Internet".

Now here I want to get the list of all the connection adapters. Along with that want to get which is the Active i mean which is being used.

I searched in google but din't found any proper solution instead of "InternetGetConnectedStateEx" API which only shows if the internet is Active or Disabled.

Is it possible in VB6.0 to get lists of all Internet Connections Adapters with ther Active status?

Thanks in advace,
with warm Regards,
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Mozilla Control Error

April 18, 2013, 3:25 am
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Hello everyone,
I have downloaded and installed the latest version of "Mozilla Active X control 1.7.12" from
Code:
http://www.iol.ie/~locka/mozilla/control.htm
Added it's component "mozctl.dll" in my vb6.0 project. It's browser is working fine and showing webpage.
But I am getting error "Automation error Library not registered." on getting the html source of the loaded webpage.
I am using codes

MozillaBrowser1.Document.body.innerHtml

I've searched about this error, but not getting any working solution. Which Library is not registered and how to register that? Where i am doing wrong. Please correct me and tell how to get webpage html source code by using Mozilla Control in vb6.

Thanks
Regards,
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Cpu Utilization in vb6

April 18, 2013, 8:15 am
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Attachment 99175


Code:
Private Wmi As Object, Locator As Object
Private PrevCpuTime As Long, SampleRate As Long


Private Sub Form_Load()
    SampleRate = 2 'in seconds
    Timer1.Interval = SampleRate * 1000
    Set Locator = CreateObject("WbemScripting.SWbemLocator")
    Set Wmi = Locator.ConnectServer
    Timer1_Timer
End Sub


Private Sub Timer1_Timer()
    Dim Procs As Object, Proc As Object
    Dim CpuTime, Utilization As Single
    Set Procs = Wmi.InstancesOf("Win32_Process")


    For Each Proc In Procs


        If Proc.ProcessID = 0 Then 'System Idle Process
            CpuTime = Proc.KernelModeTime / 10000000


            If PrevCpuTime <> 0 Then
                Utilization = 1 - (CpuTime - PrevCpuTime) / SampleRate
                Text1.Text = Format(Utilization, "0.0%")
            End If
            PrevCpuTime = CpuTime
        End If
    Next
End Sub
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VB6 - Zipper & ZipWriter, Zipping from VB programs

May 2, 2013, 10:55 am
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Background

A lot of us find the need to create ZIP archives programmatically from time to time. There are a number of techniques we can use, from spawning external utility programs to 3rd party components to Shell automation.

Here is yet another way to accomplish this: using the free, open source zlibwapi.dll


Minizip

In addition to providing a STDCALL version of ZLib that we can call easily from VB6 programs zlibwapi.dll includes the Minizip project code as well.

Like a lot of open source hacked out by C coders this can be rough in many places, but it is widely used and well proven. It should have few if any bugs in the most recent version.

I'm using version 1.25 here. You can get this from:

Minizip: Zip and UnZip additionnal library

See the typo there? This is just one symptom of some of the issues, but fortunately the code at least seems to work fine even if its source is wonky with lots of flaws in comments and general documentation issues.

This DLL is not included in the attachment. You must download it yourself.

Quote:
In zlib125dll.zip there is the Win32 Windows DLL of my Windows DLL named Zlibwapi.dll that contains both zLib and Minilib.
The file you want from this ZIP archive is:

zlib125dll.zip\dll32\zlibwapi.dll


ZipWriter

ZipWriter is a VB6 Class that wraps zlibwapi.dll to provide you with a way to create a ZIP archive and actually write data into it as archived files with no intermediate disk I/O steps.

You can use this as-is in many cases without the other code offered here.


Zipper

Zipper is a VB6 UserControl that wraps ZipWriter and a small helper ZipFile Class to give you the ability to create a ZIP archive (or add to an existing one) and add a list of disk files to it.

Zipper.Zip is an async operation and reports back progress, errors, and completion through several events. There is a Zipper.Cancel method if you need that.


ZipDemo

ZipDemo is a VB6 project that demonstrates use of the items described above.

You must download zlibwapi.dll and copy it into this project folder to run the program.

Much of the bulk of this attachment consists of the sample files in the "samples2" folder included.


There is a "ZipWriter" button that does a simple test of ZipWriter, creating a new ZIP archive "test.zip" with two files written to it. When that step completes the "Zipper" button is enabled.

The "Zipper" button tests Zipper, adding the files it finds in the "samples2" folder to the "test.zip" created in the first stage of the demo. While running a progressbar is updated and a "Cancel" button is enabled.

The "samples2" folder as supplied has just a few small files. Be sure to copy some larger files into it and rerun the program to see how things go with large files. The performance is fairly good.


Remarks

While you need to deploy zlibwapi.dll with your programs this is a standard DLL that you can feel free to place next to your EXE. No registration is required.

The results are better than those achieved using most other common techniques. Progress/Cancel/Complete can be really nice to have. There is no need for the shaky, convoluted, hackish window spelunking people often resort to when automating Shell objects.

There is a lot more you can do with zlibwapi.dll too. You can read from ZIP archives, unzip them, compress separate files outside of ZIP archives, compress/expand data in memory, etc. Even the huge-file Zip64 format is supported.

All you need is to write additional wrappers or just make the calls directly.
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[VB6] HotKeyW - Unicode Hot Key UserControl

May 11, 2013, 1:37 pm
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A simple and lightweight Hot Key UserControl that "enables the user to enter a combination of keystrokes to be used as a hot key". This is a drop-in ready UserControl module that wraps the Hot Key control from Windows' Common Controls Library.


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Very Cheap Text/Voice Chat Application

May 13, 2013, 7:36 pm
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VB6 Crypto API

May 14, 2013, 11:48 pm
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I cannot take credit for the cCrypt.cls used here, but I ran across it while searching for information on implementing TLS using the MS Crypto API. Unfortunately it did not help me with TLS, and I could not find who to give credit, but I was impressed with the quality of the code in the way that it encompassed most of the supported algorithms in the API. I am more interested in limited cryptography targeted to the TLS handshake, and I am having a great deal of difficulty finding relative information.

J.A. Coutts
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create ocx tutorial

May 16, 2013, 10:25 am
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VB - LED simulator Simulating a LED light emitting diode

May 17, 2013, 11:04 am
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Interesting way to present a process monitor, servers, control aplications ON/OFF, electronic kits etc.
Simulating a LED light emitting diode, add sound may be an improvement ...

I hear comments
Greetings from Mexico
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monster list codes 2

May 19, 2013, 3:59 am
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Capturing audio Events

Code:
Dim WithEvents Encoder As WMEncoder

Private Sub Encoder_OnStateChange(ByVal enumState As WMEncoderLib.WMENC_ENCODER_STATE)
    ' Wait until the encoding process stops before
    ' exiting the application.
    If enumState = WMENC_ENCODER_RUNNING Then
        ' TODO: Handle running state.
    ElseIf enumState = WMENC_ENCODER_PAUSED Then
        ' TODO: Handle paused state.
    ElseIf enumState = WMENC_ENCODER_STOPPED Then
        ' End the application.
        End
    Else
        ' TODO: Handle other encoder states.
    End If
End Sub

Private Sub Form_Load()
    ' Create a WMEncoder object.
    Set Encoder = New WMEncoder
 
    ' Retrieve the source group collection and add a source group.
    Dim SrcGrpColl As IWMEncSourceGroupCollection
    Set SrcGrpColl = Encoder.SourceGroupCollection
    Dim SrcGrp As IWMEncSourceGroup2
    Set SrcGrp = SrcGrpColl.Add("SG_1")
   
    ' Add a video and audio source to the source group.
    Dim SrcVid As IWMEncVideoSource2
    Dim SrcAud As IWMEncAudioSource
    Set SrcVid = SrcGrp.AddSource(WMENC_VIDEO)
    Set SrcAud = SrcGrp.AddSource(WMENC_AUDIO)
   
    ' Identify the source files to encode.
    SrcVid.SetInput "C:\\InputFile.mpg"
    SrcAud.SetInput "C:\\InputFile.mpg"
   
    ' Choose a profile from the collection.
    Dim ProColl As IWMEncProfileCollection
    Dim Pro As IWMEncProfile
    Dim i As Integer
    Dim lLength As Long
   
    Set ProColl = Encoder.ProfileCollection
    lLength = ProColl.Count
   
    For i = 0 To lLength - 1
        Set Pro = ProColl.Item(i)
        If Pro.Name = "Windows Media Video 8 for Local Area Network (384 Kbps)" Then
            SrcGrp.Profile = Pro
            Exit For
        End If
    Next
   
    ' Fill in the description object members.
    Dim Descr As IWMEncDisplayInfo
    Set Descr = Encoder.DisplayInfo
    Descr.Author = "Author name"
    Descr.Copyright = "Copyright information"
    Descr.Description = "Text description of encoded content"
    Descr.Rating = "Rating information"
    Descr.Title = "Title of encoded content"
     
    ' Specify a file object in which to save encoded content.
    Dim File As IWMEncFile
    Set File = Encoder.File
    File.LocalFileName = "C:\\OutputFile.wmv"
     
    ' Start the encoding process.
    Encoder.Start
End Sub

Broadcasting a Live Stream Using the Predefined UI
Code:
The following example shows how to create the predefined user interface and broadcast live multimedia content from the local computer. The audio and video sources are configured to use the default sound card and capture card. Use a blank form for this example.

' Create WMEncoderApp and WMEncoder objects.
  Dim Encoder As WMEncoder
  Dim EncoderApp As WMEncoderApp

Private Sub Form_Load()
  Set EncoderApp = New WMEncoderApp
  Set Encoder = EncoderApp.Encoder

' Display the predefined Encoder UI.
  EncoderApp.Visible = True

' Specify the source for the input stream.
  Dim SrcGrpColl As IWMEncSourceGroupCollection
  Dim SrcGrp As IWMEncSourceGroup
  Dim SrcVid As IWMEncSource
  Dim SrcAud As IWMEncSource

  Set SrcGrpColl = Encoder.SourceGroupCollection
  Set SrcGrp = SrcGrpColl.Add("SG_1")
  Set SrcVid = SrcGrp.AddSource(WMENC_VIDEO)
  Set SrcAud = SrcGrp.AddSource(WMENC_AUDIO)

  SrcVid.SetInput "DEVICE://Default_Video_Device"
  SrcAud.SetInput "DEVICE://Default_Audio_Device"

' Specify a profile.
  Dim ProColl As IWMEncProfileCollection
  Dim Pro As IWMEncProfile
  Dim i As Integer

  Set ProColl = Encoder.ProfileCollection

  For i = 0 To ProColl.Count - 1
    Set Pro = ProColl.Item(i)
    If Pro.Name = "Windows Media Video 8 for Local Area Network (384 Kbps)" Then
        SrcGrp.Profile = Pro
        Exit For
    End If
  Next

' Create a broadcast.
  Dim BrdCst As IWMEncBroadcast
  Set BrdCst = Encoder.Broadcast
  BrdCst.PortNumber(WMENC_PROTOCOL_HTTP) = 8080

' Start the encoding process.
  Encoder.Start

End Sub

Configuring Multiple Source Groups
Code:
The following example shows how you can set up two source groups with audio and video content. The first source group uses a file (C:\InputFile.mpg), and the second source group uses the default sound card and capture card. The result is broadcasted from the local computer (http://computer_name:8080).

For information about enumerating the audio and video devices on your system, see the Listing All Devices (Visual Basic) example.

Sub Main()
' Create a Windows Media Encoder object.
  Dim Encoder As WMEncoder
  Set Encoder = New WMEncoder
 
' Create a source group collection object from the WMEncoder object.
  Dim SrcGrpColl As IWMEncSourceGroupCollection
  Set SrcGrpColl = Encoder.SourceGroupCollection
 
' Create a profile collection object from the WMEncoder object.
  Dim ProColl As IWMEncProfileCollection
  Set ProColl = Encoder.ProfileCollection
 
' Add a source group named SG1 to the collection.
' Create a source object for each type of multimedia content
' in the source group.
  Dim SrcGrp1 As IWMEncSourceGroup2
  Dim SrcAud1 As IWMEncAudioSource
  Dim SrcVid1 As IWMEncVideoSource2
  Set SrcGrp1 = SrcGrpColl.Add("SG1")
  Set SrcAud1 = SrcGrp1.AddSource(WMENC_AUDIO)
  Set SrcVid1 = SrcGrp1.AddSource(WMENC_VIDEO)
 
' Create a second source group named SG2, and two source objects.
  Dim SrcGrp2 As IWMEncSourceGroup2
  Dim SrcAud2 As IWMEncAudioSource
  Dim SrcVid2 As IWMEncVideoSource2
  Set SrcGrp2 = SrcGrpColl.Add("SG2")
  Set SrcAud2 = SrcGrp2.AddSource(WMENC_AUDIO)
  Set SrcVid2 = SrcGrp2.AddSource(WMENC_VIDEO)
 
' Create an IWMEncBroadcast object and specify a port and a protocol.
  Dim Brdcst As IWMEncBroadcast
  Set Brdcst = Encoder.Broadcast
  Brdcst.PortNumber(WMENC_PROTOCOL_HTTP) = 8080
 
' Specify the input for the sources in the first source group.
' For this example, source group 1 uses file sources.
  SrcAud1.SetInput "C:\InputFile.mpg"
  SrcVid1.SetInput "C:\InputFile.mpg"
 
' Create a profile object. For brevity, this example uses the first
' profile in the collection. Then specify this profile object as
' the profile to use in source group 1.
  Dim Pro As IWMEncProfile
  Set Pro = ProColl.Item(0)
  SrcGrp1.Profile = Pro
 
' Specify the input sources for source group 2. In this example,
' the sources are the default audio and video devices.
' Set the profile for source group 2 to the same profile object.
  SrcAud2.SetInput "DEVICE://Default_Audio_Device"
  SrcVid2.SetInput "DEVICE://Default_Video_Device"
  SrcGrp2.Profile = Pro
 
' Set source group 1 to roll over automatically to source group 2.
' -1 indicates that the rollover happens when source group 1
' has been encoded.
  SrcGrp1.SetAutoRollover -1, "SG2"
 
' Start encoding.
  Encoder.Start

' For this example, use a message box to stop the application when you
' have finished encoding.
  MsgBox "Click OK to stop encoding."

End Sub

Controlling a Digital Device (Visual Basic)

Code:
Controlling a Digital Device (Visual Basic)
This example shows how to:

Use a digital device as a source.
Use VCR-style buttons to forward, rewind, play, and stop the tape.
View the device output as you cue the tape before encoding.
Use events to monitor changes in state.
This example uses a pre-preview to display the stream before encoding begins, and a preview of the stream during encoding.

To use this example, you need:

A form (Form1).
A frame (PreviewFrame).
Four VCR-style buttons (btnREW, btnPLAY, btnFF, and btnSTOP).
A button to start the encoding process (btnEncode).
A label (Label1) for displaying the state of the device.
In addition to the Windows Media Encoder reference, you must also add the Windows Media Encoder Device Control and the Windows Media Encoder Preview Control references to your project.

It is also assumed that you have a digital device connected to the computer. The Windows Media Encoder SDK supports digital video (DV) devices connected to an IEEE 1394 digital video port, and video tape recorder (VTR) devices connected through a COM port using the Sony RS422 protocol.

Option Explicit

'Declare variables.
Dim WithEvents Encoder As WMEncoder
Dim SrcGrpColl As IWMEncSourceGroupCollection
Dim SrcGrp As IWMEncSourceGroup2
Dim SrcAud As IWMEncSource
Dim SrcVid As IWMEncVideoSource
Dim ProColl As IWMEncProfileCollection
Dim Pro As IWMEncProfile
Dim File As IWMEncFile
Dim DCPlugMgr As IWMEncDeviceControlPluginInfoManager
Dim PlugInfo As IWMEncPluginInfo
Dim DCColl As IWMEncDeviceControlCollection
Dim DControl As IWMEncDeviceControl
Dim DCPlugin As IWMEncDeviceControlPlugin
Dim DVColl_Preview As IWMEncDataViewCollection
Dim Preview As WMEncDataView
Dim PrePreview As WMEncPrepreview
Dim lPreviewStream As Integer
Dim sDeviceString As String
Dim i As Integer, j As Integer

Private Sub Form_Load()
' Create a WMEncoder object.
  Set Encoder = New WMEncoder

' Retrieve a device control plug-in info manager object from WMEncoder.
  Set DCPlugMgr = Encoder.DeviceControlPluginInfoManager

' Loop through the connected digital devices on the system such as DV cameras and VTRs.
  For i = 0 To DCPlugMgr.Count - 1

  ' Set the IWMEncPluginInfo object to the current plug-in.
    Set PlugInfo = DCPlugMgr.Item(i)
   
  ' Find the first device plug-in that supports resources.
    If PlugInfo.SchemeType = "DeviceControl" And PlugInfo.Resources = True Then
        sDeviceString = PlugInfo.Item(0)
        Exit For
    End If

  Next i
 
' Add the device as the audio source and video source.
  Set SrcGrpColl = Encoder.SourceGroupCollection
  Set SrcGrp = SrcGrpColl.Add("SG_1")
  Set SrcAud = SrcGrp.AddSource(WMENC_AUDIO)
  Set SrcVid = SrcGrp.AddSource(WMENC_VIDEO)
  SrcAud.SetInput ("Device://" & sDeviceString)
  SrcVid.SetInput ("Device://" & sDeviceString)

' Encode to a file.
  Set File = Encoder.File
  File.LocalFileName = "C:\DeviceOutput.wmv"
   
' Select a profile from the collection and set it into the source group.
  Set ProColl = Encoder.ProfileCollection
  For i = 0 To ProColl.Count - 1
    Set Pro = ProColl.Item(i)
    If (Pro.Name = "Windows Media Video 8 for Local Area Network (384 Kbps)") Then
        SrcGrp.Profile = Pro
    End If
  Next i
   
' Retrieve the device control collection, then add a device to it.
  Set DCColl = SrcGrp.DeviceControlCollection
  Set DControl = DCColl.Add
  DControl.SetInput ("DeviceControl://" & sDeviceString)

  ' Initialize the encoding session.
  Encoder.PrepareToEncode True

  ' Get the plug-in from the device.
  Set DCPlugin = DControl.GetDeviceControlPlugin

  ' Get the source plug-in for the pre-preview and then display it in the frame.
  Set PrePreview = SrcVid.GetSourcePlugin
  PrePreview.SetCaptureParent PreviewFrame.hWnd

  ' Retrieve the preview collection and create a preview object.
  Set DVColl_Preview = SrcVid.PreviewCollection
  Set Preview = New WMEncDataView

End Sub
Private Sub btnEncode_Click()
  ' Specify the stream to preview.
  lPreviewStream = DVColl_Preview.Add(Preview)
 
  ' Disable the VCR buttons.
  btnREW.Enabled = False
  btnPLAY.Enabled = False
  btnFF.Enabled = False
  btnSTOP.Enabled = False
   
  ' Start encoding.
  Encoder.Start

  ' Display the preview in PreviewFrame.
  Preview.SetViewProperties lPreviewStream, PreviewFrame.hWnd
  Preview.StartView (lPreviewStream)
   
End Sub
Private Sub btnREW_Click()
  ' Rewind.
  DCPlugin.SetOperation (WMENC_DEVICE_REW)
End Sub
Private Sub btnPLAY_Click()
  ' Play.
  DCPlugin.SetOperation (WMENC_DEVICE_PLAY)
End Sub
Private Sub btnFF_Click()
  ' Forward.
  DCPlugin.SetOperation (WMENC_DEVICE_FF)
End Sub
Private Sub btnSTOP_Click()
  ' Stop.
  DCPlugin.SetOperation (WMENC_DEVICE_STOP)
End Sub

Private Sub Encoder_OnDeviceControlStateChange(ByVal EnumState As WMEncoderLib.WMENC_DEVICECONTROL_STATE, ByVal sName As String, ByVal sScheme As String)
' When the device state changes, display the state in Label1.
  Select Case EnumState:
        Case WMENC_DEVICECONTROL_PLAYING
        Label1.Caption = "Playing"
       
        Case WMENC_DEVICECONTROL_STOPPED
        Label1.Caption = "Stopped"
       
        Case WMENC_DEVICECONTROL_FASTFORWARDING
        Label1.Caption = "Forwarding"
       
        Case WMENC_DEVICECONTROL_REWINDING
        Label1.Caption = "Rewinding"
       
        Case WMENC_DEVICECONTROL_UNSTABLE
        Label1.Caption = "Unstable"
       
        Case WMENC_DEVICECONTROL_EJECT
        Label1.Caption = "Eject"
       
        Case WMENC_DEVICECONTROL_ENDOFTAPE
        Label1.Caption = "End of tape"
        bDone = True
       
    End Select
   
 End Sub
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How to read last two records in .txt file in VB?

May 22, 2013, 1:52 pm
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Hi ,

I am very new to VB. Actually i am Mainframe resouce and i got an oppertunity to write hummingbird programming scrip which is equal to VB.

As i have tight deadlines, i am not able to spend much time on learning VB. Hence i am looking for quick help.

I got a situation to read the last two records in .TXT file for some comparision logic. So,

Can you please help on how to read the last two records in .TXT file?
How to read specific record in .TXT file?
how to write the record in beginning of the .txt file every time that we write (Append at first line)

Thanks a lot in advance for your in-time help. Look fwd for your valuable response. Thanks!

Regards
Agasthya
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posting with vb6

May 31, 2013, 7:43 pm
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i wnana create an app which can post the text of text1.text in mig33 minibolg(www.mig33.com)
how? help me
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VB6 - BmpGen Helper Class for WIA 2.0

June 13, 2013, 3:46 pm
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Problem

While WIA 2.0 provides a lot of handy image capture and manipulation tools for VB, VBA, and VBScript one thing it isn't good at is creating a blank image.

There is a standard way to do this and it is even described in the code samples within the WIA 2.0 documentation. The bad news is that for anything but tiny images this can be impractically slow because of the way the WIA.Vector's .Add() method works for creating ARGB bitmaps.


Solution

You can load an image into a WIA.ImageFile object from a disk file in any of several image file formats. This works well for some applications, especially if you need a fairly complex background image to stamp other things onto. The downsides are that (a.) you need to carry along this extra image file with your program, and (b.) it doesn't address cases where you need to deal with images of sizes unknown until runtime.

However you do have the option of loading an image file "image" from a Byte array into a WIA.Vector through its .BinaryData property, and from there you can create an ImageFile object or a StdPicture object. This means you could store such a serialized "image file" as a resource and use it, or you might build one on the fly.

This is what the BmpGen object does with its single .MakeMono() method: create and return a monochrome BMP file image as a Byte array, with the dimensions and background color you specify. This addresses the dynamic dimensions issue.


Demo

The BmpGen class is packaged along with a demo Project in the attached archive.

The purpose of the demo is to show how you might make use of BmpGen.MakeMono() along with WIA to create "blank" solid color backdrop images to manipulate further. It also helps compare the performance of this technique with the standard wa of making a blank image with WIA, which gets much slower as the image dimensions increase.

Each of the three test cases creates a background and then stamps two transparent GIF "screen beans" characters onto it and displays the result in a VB6 Image control.

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The "fancy" test case loads an included PNG file from disk as the background. This works well enough and might be better for cases where you don't want a simple solid color backdrop, but has the limitations already described above.

The timings cover just the creation of the backdrop image prior to the stamping steps. They're rough timings based on Timer() but this should be accurate enough to illustrate the difference in performance.


Requirements

BmpGen has no dependencies that aren't included in Windows 95 or later. The demo itself requires WIA 2.0 which is part of Windows Vista and subsequent versions of Windows, and can also be installed into Windows XP SP1 or later if you grabbed the download before Microsoft removed it in preparation for XP's impending retirement.

To use the demo as-is you need VB6, but you could also do the same kind of thing in VBA applications making use of BmpGen which has no VB6-specific features in it.

VBScript is not supported, but you could create an VB6 ActiveX DLL containing BmpGen and make use of that in VBScript.
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VB6 - Print StdPicture Objects

June 19, 2013, 10:38 am
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I'm sure this has been covered lots of times already, but here's another take.

The basic idea is to use the Printer object's PaintPicture method to crop and scale a StdPicture as you print it. The only wrinkle here is making a few API calls to the spooler to get lists of paper sizes and printer resolutions. The user picks those things and thenwe have the metrics we need to calculate our cropping and scaling.

This demo uses a fixed StdPicture that it loads from a sample image file included in the attached archive. You could just as easily use StdPictures from a PictureBox, a WIA object, or from somewhere else. It scales the picture to fit centered within the bounds of some fixed-size margins within a chosen paper size and orientation:

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You could add cropping, you could use user-chosen margins, you could fit the image into some smaller region of the paper, etc. Here I just show how you'd go about it. To make those changes you'd just modify the calculations to fit your needs.

Code:
Private Sub cmdPrint_Click()
    'Print the StdPicture Pic centered on the selected rrinter (Pr)
    'with the selected paper (lstPapers) at the selected quality
    '(lngResolutions) within set margins.
    Dim MarginsLR As Single
    Dim MarginsTB As Single
    Dim PrintableWidth As Single
    Dim PrintableHeight As Single
    Dim ScaleFactor As Double
    Dim ScaledWidth As Double
    Dim ScaledHeight As Double

    Set Printer = Pr
    With Printer
        'Set up paper:
        .PaperSize = intPaperIds(lstPapers.ListIndex)
        .PrintQuality = lngResolutions(2 * lstResolutions.ListIndex) 'We can only set one
                                                                    'value DPI value, just
                                                                    'use X here.
        If optOrientation(1).Value Then
            .Orientation = vbPRORLandscape
        Else
            .Orientation = vbPRORPortrait
        End If

        'Scale to paper, using 0.5" margins all around.  Could also crop
        'the image here:
        MarginsLR = .ScaleX(0.5, vbInches, .ScaleMode)
        MarginsTB = .ScaleY(0.5, vbInches, .ScaleMode)
        PrintableWidth = .Width - 2 * MarginsLR
        PrintableHeight = .Height - 2 * MarginsTB

        ScaleFactor = PrintableWidth / .ScaleX(Pic.Width, vbHimetric, .ScaleMode)
        If ScaleFactor * .ScaleY(Pic.Height, vbHimetric, .ScaleMode) > PrintableHeight Then
            ScaleFactor = PrintableHeight / .ScaleY(Pic.Height, vbHimetric, .ScaleMode)
        End If

        ScaledWidth = ScaleFactor * .ScaleX(Pic.Width, vbHimetric, .ScaleMode)
        ScaledHeight = ScaleFactor * .ScaleY(Pic.Height, vbHimetric, .ScaleMode)

        'Paint (print) the image, scaled.  Could also do the actual cropping
        'here if any were desired by specifying additional arguments:
        .PaintPicture Pic, _
                      (.Width - ScaledWidth) / 2, _
                      (.Height - ScaledHeight) / 2, _
                      ScaledWidth, _
                      ScaledHeight
        .NewPage
        .EndDoc
    End With
End Sub
The demo application looks like this:

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You could show the paper sizes in mm or inches instead of 1/10 mm by doing the calculations. Those are just the units returned by the print spooler so to keep code complexity down I used them as is.

The code involved is fairly brief and the Project files are small. The attached archive is only so large because of the included sample image.
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VB6 MiniMP3 (Standalone)

June 21, 2013, 4:31 am
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Hi,

I have converted my Mini MP3 Player which was using Window Media Player available here to a standalone version. Any comments and suggests welcome.

Nightwalker
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WAV Player with Simulated Real-Time Sine Wave Display

June 22, 2013, 7:37 pm
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Plays .wav files and displays the sine wave. The sine wave appears to be created in real time but it is not. The sound is captured first in a buffer then converted to it's sine wave. A Picturebox holds the graphics of the sine wave while a 2nd Picture which sits on top of the this Picturebox moves horizontally across the graphical Picturebox thus revealing the sine wave as though it was being displayed in real time
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