c - Screen capture code produces black bitmap -

I need to add the ability to take a full screen screenshot, not just the current window. The following code produces a BMP file with the correct dimension, but the image is completely black, what am I doing wrong?

  Zero capture screen (LPCTRT LPS filePathName) {bitmapfileadder BMF header; BITMAPINFO * pbminfo; HBITMAP HBMP; File * oophile; HDC screen; HDC memedicine; Int sHeight; Int sWidth; LPBET Pibof; Bitmap bmp; Word cClrBits; RECT RCLTient; Screen = GetDC (0); MemDC = CreateCompatibleDC (screen); SHeight = GetDeviceCaps (Screen, VERTRES); SWidth = GetDeviceCaps (screen, HORZRES); // GetObject (screen, size (BITMAP), and BMP); HBmp = CreateCompatibleBitmap (screen, sWidth, sHeight); Retrieve // ​​bitmap color format, width, and height GetObject (HBMP, size (BITMAP), (LPTR) and BMP); Convert the color format to // bits count. CClrBits = (WORD) (bmp.bmPlanes * bmp.bmBitsPixel); If (cClrBits == 1) cClrBits = 1; Other if (CLRBIT BBHder.BCs = Psychopharm (BITMAPINFAAD); PBMMFA-> BMIHDitter.BBidath = BMP.BMWDath; PBMMFA-> BMI Header. BHEEET = BMPBHHIT; PBMMFA-> BMI Header. BPNS = BMPBM Plan; PBMMF -> BMI header .biBitCount = bmp.bmBitsPixel, if (cClrBits bmiHeader.biClrUsed = (1bmiHeader.biCompression = BI_RGB; // number of bytes in the array to compute color // indices in biSizeImage Inam store // width should DWORD.. // set to 0 biClrImportant for; until bitmap combine RLE // compressed pbminfo-> bmiHeader.biSizeImage = ((pbminfo-> bmiHeader.biWidth * cClrBits +31) and ~ 31) / 8 * pbminfo-> bmiHeader.biHeight that demonstrates // device key all colors pbminfo-> bmiHeader.biClrImportant = 0 ;. CreateBMPFile (lpszFilePathName, pbminfo, hBmp, memDC);} void CreateBMPFile (LPTSTR pszFile, PBITMAPINFO PBI, HBITMAP hBMP, HDC HDC) {handle HF; // file handle BITMAPFILEHEADER HDR; // bitmap file-title PBITMAPINFOHEADER pbih; // bitmap information-titles LPBYTE lpBits; // Memory Pointer DWORD dwTotal; Total count of // bytes DWORD cb; Incremental number of // bytes BYTE * hp; // byte pointer DWORD dwTmp; Int line; Pbih = (PBITMAPINFOHEADER) PBI; LPBits = (LPBETE) Global Olocco (GMEMFX, PBIH-> Biosizeimage); // color table DIB (RGBQUAD array) and bits // (array of palette index) Retrieve lines = Getbaibits (HDC, Acbimpi, 0, (Word) Pibiaiac-> Bayhait, Elpibits PBI, Diaibi_arjibiaarjiaeloaraars); // Create a .BMP file. Hf = CreateFile (pszFile, GENERIC_READ | GENERIC_WRITE, (DWORD) 0, Zero, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, (handle) NULL); Hdr.bfType = 0x4d42; // 0x42 = "B" 0x4d = "calculate M" // size of the entire file Hdr.bfSize = (DWORD) (Akarf (BITMAPFILEHEADER) + pbih-> biSize + pbih-> biClrUsed * sizeof (RGBQUAD) + pbih -> biSizeImage); Hdr.bfReserved1 = 0; Hdr.bfReserved2 = 0; // Calculate the offset of the color index Hdr.bfOffBits = (DWORD) size (BITMAPFILEHEADER) + pbih-> biSize + pbih-> biClrUsed * sizeof (RGBQUAD); // Copy BITMAPFILEHEADER to BMP file. Listfile (HF, (LPVOID) and HDR, size (bitmapfileadder), (LPDDORD) and DUTTMP, faucet); Copy the BITMAPINFOHEADER and RGBQUAD array into the // file. WriteFile (hf, (LPVOID) pbih, sizeof (BITMAPINFOHEADER) + pbih-> biClrUsed * sizeof (RGBQUAD), (LPDWORD) and dwTmp, (zero)); // Copy the array of color index to BMP file. DwTotal = cb = pbih-> biSizeImage; Hp = lpBits; LifaFile (HF, (LPTR) HP, (Int) CB, (LPDDORD) and DVTMP, Faucet); // Close the .mp file CloseHandle (HF); // free memory. GlobalFree ((HGLOBAL) lpBits); }