a challenger appears

i challenge you, /prog/, to create a program that

1. takes a screenshot of the current desktop
2. exports it to a .bmp image, with a file name equal to the name of the application plus an eight digit random number.
3. compiles to less than 4.00 kb

i have achieved the above.
can you, /prog/?
are you EXPERT enough?

//Compile with
//cl screenshot.cpp /Os /DUNICODE /link /entry:ss /subsystem:windows kernel32.lib user32.lib gdi32.lib
//Shit code, isn't it? I'm too lazy to make it good.
//In before NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL

#include <windows.h>
#include <windowsx.h>

void errhandler(char* str, void* = 0) {
    MessageBoxA(HWND_DESKTOP, str, "Error", MB_OK);
    ExitProcess(EXIT_FAILURE);
}

PBITMAPINFO CreateBitmapInfoStruct(HWND hwnd, HBITMAP hBmp)
{
    BITMAP bmp;
    PBITMAPINFO pbmi;
    WORD    cClrBits;

    // Retrieve the bitmap color format, width, and height.
    if (!GetObject(hBmp, sizeof(BITMAP), (LPSTR)&bmp))
        errhandler("GetObject", hwnd);

    // Convert the color format to a count of bits.
    cClrBits = (WORD)(bmp.bmPlanes * bmp.bmBitsPixel);
    if (cClrBits == 1)
        cClrBits = 1;
    else if (cClrBits <= 4)
        cClrBits = 4;
    else if (cClrBits <= 8)
        cClrBits = 8;
    else if (cClrBits <= 16)
        cClrBits = 16;
    else if (cClrBits <= 24)
        cClrBits = 24;
    else cClrBits = 32;

    // Allocate memory for the BITMAPINFO structure. (This structure
    // contains a BITMAPINFOHEADER structure and an array of RGBQUAD
    // data structures.)

     if (cClrBits != 24)
         pbmi = (PBITMAPINFO) LocalAlloc(LPTR,
                    sizeof(BITMAPINFOHEADER) +
                    sizeof(RGBQUAD) * (1<< cClrBits));

     // There is no RGBQUAD array for the 24-bit-per-pixel format.

     else
         pbmi = (PBITMAPINFO) LocalAlloc(LPTR,
                    sizeof(BITMAPINFOHEADER));

    // Initialize the fields in the BITMAPINFO structure.

    pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    pbmi->bmiHeader.biWidth = bmp.bmWidth;
    pbmi->bmiHeader.biHeight = bmp.bmHeight;
    pbmi->bmiHeader.biPlanes = bmp.bmPlanes;
    pbmi->bmiHeader.biBitCount = bmp.bmBitsPixel;
    if (cClrBits < 24)
        pbmi->bmiHeader.biClrUsed = (1<<cClrBits);

    // If the bitmap is not compressed, set the BI_RGB flag.
    pbmi->bmiHeader.biCompression = BI_RGB;

    // Compute the number of bytes in the array of color
    // indices and store the result in biSizeImage.
    // For Windows NT, the width must be DWORD aligned unless
    // the bitmap is RLE compressed. This example shows this.
    // For Windows 95/98/Me, the width must be WORD aligned unless the
    // bitmap is RLE compressed.
    pbmi->bmiHeader.biSizeImage = ((pbmi->bmiHeader.biWidth * cClrBits +31) & ~31) /8
                                  * pbmi->bmiHeader.biHeight;
    // Set biClrImportant to 0, indicating that all of the
    // device colors are important.
     pbmi->bmiHeader.biClrImportant = 0;
     return pbmi;
 }

void CreateBMPFile(HWND hwnd, LPTSTR pszFile, PBITMAPINFO pbi,
                  HBITMAP hBMP, HDC hDC)
 {
     HANDLE hf;                 // file handle
    BITMAPFILEHEADER hdr;       // bitmap file-header
    PBITMAPINFOHEADER pbih;     // bitmap info-header
    LPBYTE lpBits;              // memory pointer
    DWORD dwTotal;              // total count of bytes
    DWORD cb;                   // incremental count of bytes
    BYTE *hp;                   // byte pointer
    DWORD dwTmp;

    pbih = (PBITMAPINFOHEADER) pbi;
    lpBits = (LPBYTE) GlobalAlloc(GMEM_FIXED, pbih->biSizeImage);

    if (!lpBits)
         errhandler("GlobalAlloc", hwnd);

    // Retrieve the color table (RGBQUAD array) and the bits
    // (array of palette indices) from the DIB.
    if (!GetDIBits(hDC, hBMP, 0, (WORD) pbih->biHeight, lpBits, pbi,
        DIB_RGB_COLORS))
    {
        int i = GetLastError();
        errhandler("GetDIBits", hwnd);
    }

    // Create the .BMP file.
    hf = CreateFile(pszFile,
                   GENERIC_READ | GENERIC_WRITE,
                   (DWORD) 0,
                    NULL,
                   CREATE_ALWAYS,
                   FILE_ATTRIBUTE_NORMAL,
                   (HANDLE) NULL);
    if (hf == INVALID_HANDLE_VALUE)
        errhandler("CreateFile", hwnd);
    hdr.bfType = 0x4d42;        // 0x42 = "B" 0x4d = "M"
    // Compute the size of the entire file.
    hdr.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) +
                 pbih->biSize + pbih->biClrUsed
                 * sizeof(RGBQUAD) + pbih->biSizeImage);
    hdr.bfReserved1 = 0;
    hdr.bfReserved2 = 0;

    // Compute the offset to the array of color indices.
    hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) +
                    pbih->biSize + pbih->biClrUsed
                    * sizeof (RGBQUAD);

    // Copy the BITMAPFILEHEADER into the .BMP file.
    if (!WriteFile(hf, (LPVOID) &hdr, sizeof(BITMAPFILEHEADER),
        (LPDWORD) &dwTmp,  NULL))
    {
       errhandler("WriteFile", hwnd);
    }

    // Copy the BITMAPINFOHEADER and RGBQUAD array into the file.
    if (!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER)
                  + pbih->biClrUsed * sizeof (RGBQUAD),
                  (LPDWORD) &dwTmp, ( NULL)))
        errhandler("WriteFile", hwnd);

    // Copy the array of color indices into the .BMP file.
    dwTotal = cb = pbih->biSizeImage;
    hp = lpBits;
    if (!WriteFile(hf, (LPSTR) hp, (int) cb, (LPDWORD) &dwTmp,NULL))
           errhandler("WriteFile", hwnd);

    // Close the .BMP file.
     if (!CloseHandle(hf))
           errhandler("CloseHandle", hwnd);

    // Free memory.
    GlobalFree((HGLOBAL)lpBits);
}

void ss() {
    HWND hDesktopWindow = GetDesktopWindow();
    HDC hDesktopDC = GetWindowDC(HWND_DESKTOP);
    int width = GetSystemMetrics(SM_CXSCREEN), height = GetSystemMetrics(SM_CYSCREEN);
    HBITMAP hBitmap = CreateCompatibleBitmap(hDesktopDC, width, height);
    HDC hBitmapDC = CreateCompatibleDC(hDesktopDC);
    SelectBitmap(hBitmapDC, hBitmap);
    BitBlt(hBitmapDC,0,0,width,height, hDesktopDC,0,0, SRCCOPY);
    DeleteDC(hBitmapDC);
    ReleaseDC(HWND_DESKTOP, hDesktopDC);

    BITMAP bitmap;
    GetObject(hBitmap, sizeof(bitmap), &bitmap);

    BITMAPINFOHEADER bi = { sizeof BITMAPINFOHEADER, bitmap.bmWidth, bitmap.bmHeight, 1, bitmap.bmPlanes * bitmap.bmBitsPixel,
        BI_RGB };

    int colors = 1 << bi.biBitCount;
    if(colors > 256)
        colors = 0;
    unsigned length = bi.biSize + colors * sizeof RGBQUAD;

    HDC hDC = GetDC(NULL);
    HPALETTE hPal = (HPALETTE)GetStockObject(DEFAULT_PALETTE);

    SelectPalette(hDC, hPal, FALSE);
    RealizePalette(hDC);

    HANDLE hDIB = GlobalAlloc(GMEM_FIXED, length);
    if(!hDIB)
        errhandler("GlobalAlloc", 0);

    LPBITMAPINFOHEADER lpbi = (LPBITMAPINFOHEADER)hDIB;
    *lpbi = bi;

    if(!GetDIBits(hDC, hBitmap, 0, bi.biHeight, NULL, (LPBITMAPINFO)lpbi, DIB_RGB_COLORS))
        errhandler("GetDIBits186");

    bi = *lpbi;
    if (bi.biSizeImage == 0){
        bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8)
                        * bi.biHeight;
    }

    length += bi.biSizeImage;
    hDIB = GlobalReAlloc(hDIB, length, GMEM_MOVEABLE);
    if(!hDIB)
        errhandler("GlobalRealloc");

    lpbi = (LPBITMAPINFOHEADER)hDIB;
    BOOL bGotBits = GetDIBits( hDC, hBitmap,
                0L,                // Start scan line
                (DWORD)bi.biHeight,        // # of scan lines
                (LPBYTE)lpbi             // address for bitmap bits
                + (bi.biSize + colors * sizeof RGBQUAD),
                (LPBITMAPINFO)lpbi,        // address of bitmapinfo
                (DWORD)DIB_RGB_COLORS);        // Use RGB for color table

    if(!bGotBits)
    {
        errhandler("GetDIBits2");
    }

    PBITMAPINFO info = CreateBitmapInfoStruct(NULL,hBitmap);
    CreateBMPFile(0, L"ss12345678.bmp", info, (HBITMAP)hBitmap, hDC);
    ExitProcess(0);
}