Thread: Reading A Byte From A Certain Offset

  1. #1
    Registered User 4point5's Avatar
    Join Date
    Oct 2002

    Question 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.
    BOOL GetZSTFileName(HWND hWnd)
    	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;
    	hFile = CreateFile(szFileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 
    	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.
    Last edited by 4point5; 10-31-2002 at 05:58 PM.
    Don't try so hard. Just let it happen.

  2. #2
    Guest Sebastiani's Avatar
    Join Date
    Aug 2001
    Waterloo, Texas
    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);

    #include <cmath>
    #include <complex>
    bool euler_flip(bool value)
        return std::pow
            std::complex<float>(0, 1) 
            * std::complex<float>(std::atan(1.0)
            *(1 << (value + 2)))
        ).real() < 0;

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