Question

I am getting Access violation error from the debugger, but I really have no idea why. I suspect that it would be something really stupid.
I have an array of directory entries:

typedef struct dirEntry{
    TCHAR fileName[MAX_PATH];
    DWORD fileSizeLow;
    DWORD fileSizeHigh;
} dirEntry;

DWORD bufferSize = MEM_SIZE; //MEM_SIZE = 100
DWORD bufferPosition = 0;
dirEntry* dirBuffer;

dirBuffer = (dirEntry*) malloc(bufferSize*sizeof(dirEntry));

Then I pass it to a function ListDirectory(_T("D:\\books\\*"), dirBuffer, &bufferSize, &bufferPosition)

Inside the function I retrieve information about the files inside, but when I call this:

dirBuffer[*bufferPosition].fileSizeLow = dataFound.nFileSizeLow;
_tcscpy(dirBuffer[*bufferPosition].fileName, dataFound.cFileName);
*bufferPosition++;

The first line produces an exception. Can somebody please tell me what I’m doing wrong?

EDIT: Code of ListDirectory as demanded: http://pastebin.com/ScbcqX7p

Answer 1

*bufferPosition++ does not do what you think it does. It dereferences bufferPosition, then increments the pointer, not the value pointed to. You probably wanted (*bufferPosition)++, which increments the pointed-to value.

Mind you, it’s not clear why you are passing bufferPosition and bufferSize by address, since they are useless to the caller, since ListDirectory frees the data the variables refer to.