Microsoft KB Archive/173668
Article ID: 173668
Article Last Modified on 8/9/2004
- 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
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.
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
- Start a new Standard EXE project. Form1 is created by default.
- Add a CommandButton to Form1.
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
- From the Project menu, click Add Module to create a new module.
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
- Press the F5 key to run the project. Click the command button to play the AVI file.
For additional information, please see the following articles in the Microsoft Knowledge Base:
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