Windows API Implementation screenshot

References: http://bbs.csdn.net/topics/330154355

#include "stdio.h" #include "windows.h"/************************************************************************/ /* Hbitmap for just the screen bitmap handle/* lpFileName for the bitmap file name you need to save/**** /int Savebitmaptofile (Hbitmap hbitmap,lpstr lpFileName) {HDC hdc;//Device Description Table int ibits;//The number of bytes per pixel in the current display resolution WORD WBi           tcount;//the number of bytes per pixel in a bitmap DWORD dwpalettesize=0;//define the palette size DWORD dwbmbitssize;//bitmap in pixel byte size DWORD   dwdibsize;//bitmap File size DWORD dwwritten;//Write file byte count BITMAP bitmap;//bitmap structure Bitmapfileheader   BMFHDR;       Bitmap attribute structure Bitmapinfoheader bi;     Bitmap file header structure Lpbitmapinfoheader LPBI; Bitmap information header structure pointing to bitmap information header structure HANDLE fh;//definition file handle HANDLE hdib;//allocating memory handle HANDLE hpal;//allocating memory Handle HANDLE holdpal=null;//palette handle//Compute bytes per pixel for bitmap filesNumber of HDC = CreateDC ("DISPLAY", null,null,null);       Ibits = GetDeviceCaps (hdc, Bitspixel) * GetDeviceCaps (hdc, PLANES);         DeleteDC (HDC);       if (ibits <= 1) wbitcount = 1;       else if (ibits <= 4) Wbitcount = 4;       else if (ibits <= 8) Wbitcount = 8;    else if (ibits <=) Wbitcount = 24;              else if (ibits<=32) Wbitcount = 24;                   Calculate palette Size if (wbitcount <= 8) dwpalettesize = (1 << wbitcount) *sizeof (Rgbquad);       Set the bitmap information header structure GetObject (hbitmap, sizeof (BITMAP), (LPSTR) &bitmap);       bi.bisize = sizeof (Bitmapinfoheader);       Bi.biwidth = Bitmap.bmwidth;       Bi.biheight = Bitmap.bmheight;       Bi.biplanes = 1;           Bi.bibitcount = Wbitcount;       Bi.bicompression = Bi_rgb;       bi.bisizeimage = 0;       Bi.bixpelspermeter = 0;  Bi.biypelspermeter = 0;     bi.biclrused = 0;       bi.biclrimportant = 0;         Dwbmbitssize = ((bitmap.bmwidth *wbitcount+31)/32) * 4*bitmap.bmheight;       Allocates memory for bitmap content Hdib = GlobalAlloc (ghnd,dwbmbitssize+dwpalettesize+sizeof (Bitmapinfoheader));    LPBI = (lpbitmapinfoheader) globallock (HDIB);    if (lpbi==null) {return 0;       } *LPBI = bi;       Processing palette hPal = Getstockobject (Default_palette);               if (hPal) {HDC = GetDC (NULL);               Holdpal =:: SelectPalette (HDC, (Hpalette) HPal, FALSE);           RealizePalette (HDC); }//Gets the new pixel value under the palette getdibits (HDC, Hbitmap, 0, (UINT) Bitmap.bmheight, (LPSTR) LPBI + sizeof (Bitmap       Infoheader) +dwpalettesize, (Lpbitmapinfo) LPBI, dib_rgb_colors);               Restore palette if (holdpal) {SelectPalette (HDC, (Hpalette) Holdpal, TRUE);               RealizePalette (HDC);           ReleaseDC (NULL, HDC);           }//Create bitmap fileFH = CreateFile (lpfilename, generic_write, 0, NULL, create_always, File_attribute_normal |        File_flag_sequential_scan, NULL);         if (fh = = INVALID_HANDLE_VALUE) return FALSE;  Set Bitmap file Header Bmfhdr.bftype = 0x4d42;         "BM" dwdibsize = sizeof (Bitmapfileheader) + sizeof (Bitmapinfoheader) + dwpalettesize + dwbmbitssize;       Bmfhdr.bfsize = dwdibsize;       bmfhdr.bfreserved1 = 0;       Bmfhdr.bfreserved2 = 0;         Bmfhdr.bfoffbits = (DWORD) sizeof (Bitmapfileheader) + (DWORD) sizeof (Bitmapinfoheader) + dwpalettesize;         Write Bitmap file header WriteFile (FH, (LPSTR) &bmfhdr, sizeof (Bitmapfileheader), &dwwritten, NULL);         Write the remaining contents of the bitmap file WriteFile (FH, (LPSTR) LPBI, Dwdibsize, &dwwritten, NULL);       Clear GlobalUnlock (HDIB);       GlobalFree (HDIB);         CloseHandle (FH); return 1;}       Hbitmap getcapturebmp () {HDC hdc;       HDC MEMDC;       Byte* Data;  Hbitmap hbmp;     Bitmapinfo bi;       memset (&bi, 0, sizeof (BI));    bi.bmiHeader.biSize = sizeof (BITMAPINFO);       Bi.bmiHeader.biWidth = GetSystemMetrics (Sm_cxscreen);       Bi.bmiHeader.biHeight = GetSystemMetrics (Sm_cyscreen);       Bi.bmiHeader.biPlanes = 1;            Bi.bmiHeader.biBitCount = 24;       HDC = GetDC (NULL);       MEMDC = CreateCompatibleDC (HDC);       hbmp = CreateDIBSection (MEMDC, &bi, Dib_rgb_colors, (void**) &data, NULL, 0);       SelectObject (MEMDC, hbmp);       BitBlt (MEMDC, 0, 0, bi.bmiHeader.biWidth, bi.bmiheader.biheight,hdc, 0, 0, srccopy);         ReleaseDC (NULL, HDC);       DeleteDC (MEMDC);   return hbmp;        } void Main () {hbitmap hbmp;     hbmp = Getcapturebmp ();   Savebitmaptofile (hbmp, "c:\\11.bmp"); }

Windows API Implementation