Thread: VFW32 Function Call Error C2664

Im trying to write code that reads AVI file information. I use vfw.h

The code is something like this:


code:

void OpenAVI(LPCSTR szFile); //declaration in header
-munch-

OpenAVI("test.avi"); // Calls function with filename in main
-munch-

void OpenAVI(LPCSTR szFile) // Opens avi file
{
AVIFileInit();

AVIStreamOpenFromFile(&pavi, szFile, streamtypeVIDEO, 0, OF_READ, NULL) ; // barfs on 2nd param
}

end code:


Here is the compiling error:
error C2664: 'AVIStreamOpenFromFileW' : cannot convert parameter 2 from 'const char *' to 'const unsigned short *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast

When I dont use classes in the header, this code compiles fine without a function declaration, however, with a class in the header, I get this error. Thank you for any help.
-David

Try:

Code:

void OpenAVI(LPCTSTR szFile);

This should work.

Thank you both very much for your quick replies.

Monster: Ive used that before, but it causes massive errors in some AVI DLL other than VFW. The segment of code works perfectly, until I add a class to the program. As soon as the class is there, the 2nd parameter barfs.


xds4ls: Im quite stale at programming, so I have tried to look up what you mean by 'just try to do the cast'. Ive been stuck on this problem C2664 for a week now, and Ive done lots of research. I just dont understand how the code has no problems when its run in a program without classes, and wont work with classes.
Sorry about not posting the code as its supposed to, but it wouldnt let me use the tags as unregistered.

I thought that maybe I needed to call a vfw class in front of the function as below, but this doesnt help.

Code:

   vfw::AVIStreamOpenFromFile(&pavi, szFile, streamtypeVIDEO, 0, OF_READ, NULL) //tried using stdapi:: and vfwapi:: in place of vfw:: - no success.

I also tried the following, where I didnt pass the text into a variable:

Code:

void OpenAVI()
{
   LPCSTR szFile="test.avi"; // Also tried using LPCTSTR
   AVIStreamOpenFromFile(&pavi, szFile, streamtypeVIDEO, 0, OF_READ, NULL);
}

This too gives an invalid 2nd parameter, BUT ONLY in a program where I have a class in the header file.

Thank you.