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Microsoft KB Archive/173668

From BetaArchive Wiki

Article ID: 173668

Article Last Modified on 8/9/2004



APPLIES TO

  • Microsoft Visual Basic 5.0 Learning Edition
  • Microsoft Visual Basic 5.0 Professional Edition
  • Microsoft Visual Basic 5.0 Enterprise Edition



This article was previously published under Q173668

SUMMARY

This article shows you how to play an AVI file stored in a resource .dll file through Visual Basic. Although you can add an AVI file to a resource file in Visual Basic and then compile the Visual Basic project into a .dll file, the AVI file is accessible only through Visual Basic.

An AVI file stored in a resource .dll file compiled in Visual C++ has two advantages:

  • The file is accessible from more than one application written in several different programming languages, such as both Visual C and Visual Basic.
  • If you need to change the resource file because you need to change the AVI file, you only have to change one file. That file can reside on a server and become accessible to all programs using that file.


MORE INFORMATION

The following files are available for download from the Microsoft Download Center:

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services


Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file. When you run the self-extracting file Avirsce.exe, the following files are expanded into the directory, AVI Resource Sample Project, on your hard drive:

 - Avirsce.vbp (1Kb)-the project file
 - Avirsce.vbw (1Kb)-the workspace file
 - Form1.frm   (2Kb)-the form file
 - Module1.bas (5Kb)-the module file
 - Readme.txt       -you are reading this file
                


Steps to Create the Sample

This sample assumes you have a compiled resource .dll file with an AVI file. You also need the Resource.h file for the resource .dll file in order to determine the identifier for the AVI file.

Look for a line similar to this one in the Resource.h file to determine the AVI file identifier:

   #define IDR_AVI1     101
                


The identifier for the AVI file in this case is 101.

To create a resource .dll file containing an AVI file, please see the following article in the Microsoft Knowledge Base:

178199 HOWTO: Create a Resource DLL File Containing an AVI




  1. Start a new Standard EXE project. Form1 is created by default.
  2. Add a CommandButton to Form1.
  3. Copy the following code to the Code window of the Form1 form. (Add the AVI file identifier and the path to the resource .dll file in the lines marked with the comment <<<< ):

          Option Explicit
          Private Sub Command1_Click()
             Dim hRsrc As Long
             Dim hGlobal As Long
             Dim lpString As String
             Dim strCmd As String, strReturnVal As String
             Dim nbuf As Long
    
             'Identifier for the AVI in the resource file from the resource.h
             'file of the resource dll, which must be preceded by '#'.
             lpString = "#101" '                                       <<<<
    
             'Loads the resource
             'Change the filename argument in the next line to the path and
             'filename of your resource dll file.
             hInst = LoadLibrary("<Path resource dll file name>") '    <<<<
             hRsrc = FindResource(hInst, lpString, "AVI")
             hGlobal = LoadResource(hInst, hRsrc)
             lpData = LockResource(hGlobal)
             fileSize = SizeofResource(hInst, hRsrc)
    
             Call mmioInstallIOProc(MEY, AddressOf IOProc, _
                                    MMIO_INSTALLPROC + MMIO_GLOBALPROC)
             nbuf = 256
    
             'Play the AVI file
             strCmd = "open test.MEY+ type avivideo alias test"
             strReturnVal = mciSendString(strCmd, 0&, 0&, 0&)
             strCmd = "play test wait"
             strReturnVal = mciSendString(strCmd, 0&, 0&, 0&)
             strCmd = "close test"
             strReturnVal = mciSendString(strCmd, 0&, 0&, 0&)
    
             Call mmioInstallIOProc(MEY, vbNull, MMIO_REMOVEPROC)
             FreeLibrary hInst
          End Sub
    
                        
  4. From the Project menu, click Add Module to create a new module.
  5. Copy the following code to the code window of the Module1 module.

          Option Explicit
          Public lpData As Long
          Public fileSize As Long
          Public hInst As Long
    
          Public Const MMIO_INSTALLPROC = &H10000   'mmioInstallIOProc:install
                                                    'MMIOProc
    
          Public Const MMIO_GLOBALPROC = &H10000000 'mmioInstallIOProc: install
                                                    'globally
    
          Public Const MMIO_READ = &H0
          Public Const MMIOM_CLOSE = 4
          Public Const MMIOM_OPEN = 3
          Public Const MMIOM_READ = MMIO_READ
          Public Const MMIO_REMOVEPROC = &H20000
          Public Const MMIOM_SEEK = 2
          Public Const SEEK_CUR = 1
          Public Const SEEK_END = 2
          Public Const SEEK_SET = 0
          Public Const MEY = &H2059454D   'This is the value of "MEY " run
                                          'through FOURCC
    
          'Create a user defined variable for the API function calls
          Public Type MMIOINFO
             dwFlags As Long
             fccIOProc As Long
             pIOProc As Long
             wErrorRet As Long
             htask As Long
             cchBuffer As Long
             pchBuffer As String
             pchNext As String
             pchEndRead As String
             pchEndWrite As String
             lBufOffset As Long
             lDiskOffset As Long
             adwInfo(4) As Long
             dwReserved1 As Long
             dwReserved2 As Long
             hmmio As Long
          End Type
    
          'Finds the specified resource in an executable file. The function
          'returns a resource handle that can be used by other functions used
          'to load the resource.
          Public Declare Function FindResource Lib "kernel32" _
             Alias "FindResourceA" _
             (ByVal hInstance As Long, _
              ByVal lpName As String, _
              ByVal lpType As String) _
             As Long
    
          'Returns a global memory handle to a resource in the specified
          'module. The resource is only loaded after calling the LockResource
          'function to get a pointer to the resource data.
          Public Declare Function LoadResource Lib "kernel32" _
             (ByVal hInstance As Long, _
              ByVal hResInfo As Long) _
              As Long
    
          'Locks the specified resource. The function returns a 32-bit pointer
          'to the data for the resource.
          Public Declare Function LockResource Lib "kernel32" _
             (ByVal hResData As Long) As Long
    
          'Loads the specified dll file and maps the address space for the
          'current process.
          Public Declare Function LoadLibrary Lib "kernel32" _
             Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
    
          'Frees the specified .dll file loaded with the LoadLibrary function.
          Public Declare Function FreeLibrary Lib "kernel32" _
             (ByVal hLibModule As Long) As Long
    
          'Copies a block of memory from one location to another.
          Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" _
             (hpvDest As Any, _
              hpvSource As Any, _
              ByVal cbCopy As Long)
    
          'Installs or removes a custom I/O procedure. This function also
          'locates an installed I/O procedure, using its corresponding
          'four-character code.
          Public Declare Function mmioInstallIOProc Lib "winmm" _
             Alias "mmioInstallIOProcA" _
             (ByVal fccIOProc As Long, _
              ByVal pIOProc As Long, _
              ByVal dwFlags As Long) _
              As Long
    
          'Sends the specified command string to an MCI device.
          Public Declare Function mciSendString Lib "winmm.dll" _
             Alias "mciSendStringA" _
             (ByVal lpstrCommand As String, _
              ByVal lpstrReturnString As Long, _
              ByVal uReturnLength As Long, _
              ByVal hwndCallback As Long) _
             As Long
    
          'Returns the size, in bytes, of the specified resource.
          Public Declare Function SizeofResource Lib "kernel32" _
             (ByVal hInstance As Long, _
              ByVal hResInfo As Long) As Long
    
          'Accesses a unique storage system, such as a database or file
          'archive. Install or remove this callback function with the
          'mmioInstallIOProc function.
          Public Function IOProc _
             (ByRef lpMMIOInfo As MMIOINFO, _
              ByVal uMessage As Long, _
              ByVal lParam1 As Long, _
              ByVal lParam2 As Long) _
              As Long
    
          Static alreadyOpened As Boolean
    
          Select Case uMessage
             Case MMIOM_OPEN
                If Not alreadyOpened Then
                    alreadyOpened = True
                    lpMMIOInfo.lDiskOffset = 0
                End If
                IOProc = 0
    
             Case MMIOM_CLOSE
                IOProc = 0
    
             Case MMIOM_READ:
                Call CopyMemory(ByVal lParam1, ByVal _
                                lpData + lpMMIOInfo.lDiskOffset, lParam2)
                lpMMIOInfo.lDiskOffset = lpMMIOInfo.lDiskOffset + lParam2
                IOProc = lParam2
    
             Case MMIOM_SEEK
    
             Select Case lParam2
                Case SEEK_SET
                   lpMMIOInfo.lDiskOffset = lParam1
    
                Case SEEK_CUR
                   lpMMIOInfo.lDiskOffset = lpMMIOInfo.lDiskOffset + lParam1
                   lpMMIOInfo.lDiskOffset = fileSize - 1 - lParam1
    
                Case SEEK_END
                   lpMMIOInfo.lDiskOffset = fileSize - 1 - lParam1
             End Select
    
             IOProc = lpMMIOInfo.lDiskOffset
    
             Case Else
                IOProc = -1 ' Unexpected msgs.  For instance, we do not
                            ' process MMIOM_WRITE in this sample
          End Select
    
          End Function ' IOProc
    
                        
  6. Press the F5 key to run the project. Click the command button to play the AVI file.


REFERENCES

For additional information, please see the following articles in the Microsoft Knowledge Base:

124947 Retrieving Palette Information From a Bitmap Resource

155360 How to use MCI to Play AVI/WAVE Files From Memory




Visual Basic 5.0 Programmer's Guide to the Win32 API by Dan Appleman, ZD Press

Platform SDK Reference Guide: Multimedia Functions


Additional query words: Avirsce

Keywords: kbhowto kbdownload kbfile kbsample kbsound KB173668