Thread: Reading A Byte From A Certain Offset

I need to open a file, read a certain byte from that file, and display that number in the list box. For some reason, I can't get it to work. Here is my code.

Code:

BOOL GetZSTFileName(HWND hWnd)
{
	OPENFILENAME ofn;
	OVERLAPPED ovl;
	CHAR szFileName[MAX_PATH];
	HANDLE hFile;
	BYTE bBuffer;

    ZeroMemory(&ofn, sizeof(OPENFILENAME));
	ofn.lStructSize = sizeof(OPENFILENAME);
	ofn.hwndOwner   = hWnd;
	ofn.lpstrFilter = "ZSNES Save State Files (*.zs*)\0*.zs*\0\0";
	ofn.lpstrFile   = szFileName;
	ofn.nMaxFile    = MAX_PATH;
	ofn.Flags       = OFN_FILEMUSTEXIST;

	ZeroMemory(&ovl, sizeof(OVERLAPPED));
	ovl.Offset     = 0x3013;
	ovl.OffsetHigh = 0x0000;

	GetOpenFileName(&ofn);
	hFile = CreateFile(szFileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 
		               FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL);
	ReadFile(hFile, &bBuffer, 1, NULL, &ovl);
	SendDlgItemMessage(hWnd, IDC_ITEMS, LB_ADDSTRING, NULL, (LPARAM)bBuffer);

	return 0;
}

Any help at all would be appreciated. Thanks.

Wow. All that work for just one byte? Heh. Well tell me, are you not getting the data or just not able to get it to the control? Anyway, it looks like you're sending the byte as is to it, probably showing nothing. Look at this:

char buff[10];
char val = 26;
sprintf(buff, "%i", val);
printf("%s", buff);

See?