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

#include "stdio.h"
#include "windows.h"
/************************************************************************/
/* hBitmap    为刚才的屏幕位图句柄
/* lpFileName 为须要保存的位图文件名称
/************************************************************************/
int SaveBitmapToFile(HBITMAP hBitmap,LPSTR lpFileName)
{         HDC            hDC; //设备描写叙述表int            iBits;//当前显示分辨率下每一个像素所占字节数WORD           wBitCount;//位图中每一个像素所占字节数    DWORD          dwPaletteSize=0;//定义调色板大小DWORD          dwBmBitsSize;//位图中像素字节大小DWORD          dwDIBSize;// 位图文件大小DWORD          dwWritten;//写入文件字节数BITMAP         Bitmap;//位图结构BITMAPFILEHEADER   bmfHdr;   //位图属性结构   BITMAPINFOHEADER   bi;       //位图文件头结构LPBITMAPINFOHEADER lpbi;     //位图信息头结构     指向位图信息头结构HANDLE          fh;//定义文件句柄HANDLE            hDib;//分配内存句柄HANDLE            hPal;//分配内存句柄HANDLE          hOldPal=NULL;//调色板句柄  //计算位图文件每一个像素所占字节数   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 <= 24)wBitCount = 24;else if (iBits<=32)wBitCount = 24;//计算调色板大小   if (wBitCount <= 8)       dwPaletteSize = (1 << wBitCount) *sizeof(RGBQUAD);//设置位图信息头结构   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 ;//为位图内容分配内存   hDib  = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));   lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);if (lpbi==NULL){return 0;}*lpbi = bi;   // 处理调色板hPal = GetStockObject(DEFAULT_PALETTE);   if (hPal){       hDC  = GetDC(NULL);       hOldPal = ::SelectPalette(hDC, (HPALETTE)hPal, FALSE);       RealizePalette(hDC);       }   // 获取该调色板下新的像素值   GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight,       (LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize,(LPBITMAPINFO)lpbi, DIB_RGB_COLORS);   //恢复调色板      if (hOldPal)       {       SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);       RealizePalette(hDC);       ReleaseDC(NULL, hDC);       }   //创建位图文件       fh = CreateFile(lpFileName, GENERIC_WRITE,        0, NULL, CREATE_ALWAYS,       FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);   if (fh == INVALID_HANDLE_VALUE)       return FALSE;// 设置位图文件头   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;// 写入位图文件头   WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);// 写入位图文件其余内容   WriteFile(fh, (LPSTR)lpbi, dwDIBSize, &dwWritten, NULL);//清除      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");
}