Trying (and failing) to use an open Dialog box

This is a discussion on Trying (and failing) to use an open Dialog box within the Windows Programming forums, part of the Platform Specific Boards category; I'm trying to use one of the common dialog boxes, and I'm using code from Petzold's book, but MSVC++ is ...

  1. #1
    The Earth is not flat. Clyde's Avatar
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    Trying (and failing) to use an open Dialog box

    I'm trying to use one of the common dialog boxes, and I'm using code from Petzold's book, but MSVC++ is throwing errors at me.

    I have a function called PopFileRead():

    Code:
    {
         BYTE   bySwap ;
         DWORD  dwBytesRead ;
         HANDLE hFile ;
         int    i, iFileLength, iUniTest ;
         PBYTE  pBuffer, pText, pConv ;
    
              // Open the file.
    
         if (INVALID_HANDLE_VALUE == 
                   (hFile = CreateFile (pstrFileName, GENERIC_READ, FILE_SHARE_READ,
                                        NULL, OPEN_EXISTING, 0, NULL)))
              return FALSE ;
    
              // Get file size in bytes and allocate memory for read.
              // Add an extra two bytes for zero termination.
                        
         iFileLength = GetFileSize (hFile, NULL) ; 
         pBuffer = malloc (iFileLength + 2) ;
    
          
    and on and on....
    And i'm getting this error:

    C:\Program Files\Microsoft Visual Studio\MyProjects\winpro2\File.cpp(76) : error C2440: '=' : cannot convert from 'void *' to 'unsigned char *'

    Which is caused by the

    Code:
     pBuffer = malloc (iFileLength + 2) ;
    What's going on?

  2. #2
    S­énior Member
    Join Date
    Jan 2002
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    If you're compiling it as C++ code, you'll have to cast -

    pBuffer = (PBYTE)malloc (iFileLength + 2);

  3. #3
    The Earth is not flat. Clyde's Avatar
    Join Date
    Mar 2002
    Posts
    1,420
    thanks

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