1 #ifndef _CAPTURESCREEN_H 2 #define _CAPTURESCREEN_H 3  4 #include <windows.h> 5 class  CaptureScreen 6 { 7 public: 8     CaptureScreen() 9     {};10     ~CaptureScreen(void)11     {};12 13     void ScreenInit();14     void ScreenFree();15     bool ScreenSetWindow(LPRECT lpRect); 16     bool ScreenCopy(BYTE *dstBuf); 17 18     int rHeight;    //要获得的图像尺寸19     int rWidth;20 private:    21     int nScreenWidth;22     int nScreenHeight;23     PRGBTRIPLE scan0;24     BITMAPINFO pbi;25     int stride;    26     int top_x;27     int top_y;28     int bot_x;29     int bot_y;30 };31 32 #endif

 1 #include "CaptureScreen.h" 2  3 void CaptureScreen::ScreenInit() 4 {     5     nScreenWidth = GetSystemMetrics(SM_CXSCREEN); 6     nScreenHeight = GetSystemMetrics(SM_CYSCREEN); 7  8     pbi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); 9     pbi.bmiHeader.biWidth = nScreenWidth;10     pbi.bmiHeader.biHeight = nScreenHeight;11     pbi.bmiHeader.biPlanes = 1;12     pbi.bmiHeader.biBitCount = 24;13     pbi.bmiHeader.biCompression = BI_RGB;14     stride = ((nScreenWidth * 24 + 31) & 0xffffffe0) / 8;  // 24位图像扫描线宽度15     scan0 = (PRGBTRIPLE)malloc(stride * nScreenHeight);    // 图像数据缓冲区，应释放16 }17 18 void CaptureScreen::ScreenFree()19 {20     free(scan0); 21 }22 23 bool CaptureScreen::ScreenSetWindow(LPRECT lpRect)24 {25      top_x = lpRect->left;26      top_y = lpRect->top;27      bot_x = lpRect->right;28      bot_y = lpRect->bottom;29     if(top_x >= bot_x)30     return false;31     if(top_y >= bot_y)32     return false;33     if(top_x<0 || bot_x>nScreenWidth)34     return false;35     if(top_y<0 || bot_y>nScreenHeight)36     return false;37 38     rHeight = bot_y-top_y;39     rWidth =  bot_x-top_x;    40     return true;41 }42 43 bool CaptureScreen::ScreenCopy(BYTE *dstBuf)44 {    45     HWND hDesktopWnd = GetDesktopWindow();46     HDC hDesktopDC = GetDC(hDesktopWnd);47     HDC hCaptureDC = CreateCompatibleDC(hDesktopDC);48     HBITMAP hCaptureBitmap =CreateCompatibleBitmap(hDesktopDC,nScreenWidth, nScreenHeight);49     SelectObject(hCaptureDC,hCaptureBitmap);50     BitBlt(hCaptureDC,0,0,nScreenWidth,nScreenHeight,hDesktopDC,0,0,SRCCOPY|NOMIRRORBITMAP);51     DeleteDC(hCaptureDC);52 53     GetDIBits(hDesktopDC, hCaptureBitmap, 0, nScreenHeight, scan0, &pbi, DIB_RGB_COLORS);54     ReleaseDC(hDesktopWnd,hDesktopDC);55     DeleteObject(hCaptureBitmap);56 57     BYTE *srcBuf = (BYTE*) scan0;58 59     int j;60     srcBuf += (nScreenHeight-1-top_y)*stride+top_x*3;// scan0倒序61     for(j=0;j<rHeight;j++)62     {63         memcpy(dstBuf,srcBuf,rWidth*3);64         dstBuf += rWidth*3;65         srcBuf -= stride;66     }67     return true;68 }

 1 #include "CaptureScreen.h" 2 #include <stdio.h>  3 #include <Mmsystem.h> 4 #pragma comment( lib,"winmm.lib" ) 5 void SaveBmp2(BYTE *bgr32,int w,int h,int mode) 6 { 7      8     ///////////////////////////////////////////// 9     DWORD size=w*h*3;10     LPSTR lpData=http://www.mamicode.com/(LPSTR)GlobalAlloc(GPTR,size);11     /////////////////////////////////////////////12     BITMAPINFOHEADER bih;13     bih.biSize=sizeof(BITMAPINFOHEADER);14     bih.biWidth=w;15     bih.biHeight=h;16     bih.biPlanes=1;17     bih.biBitCount=24;18     bih.biCompression=0;19     bih.biSizeImage=w*h*3;//size;20     bih.biXPelsPerMeter=0;21     bih.biYPelsPerMeter=0;22     bih.biClrUsed=0;23     bih.biClrImportant=0;24     25     BITMAPFILEHEADER bfh;26     bfh.bfType=0x4D42;  // "BM"      // 设置位图文件头27        bfh.bfReserved1=bfh.bfReserved2=0;28     bfh.bfSize=54+size;29     bfh.bfOffBits=54;30 31     if(mode == 0)32     {33     for(int i=0;i<h;i++)34     {35         memcpy(lpData+(h-1-i)*w*3,bgr32+i*w*3,w*3);36     }37     }38     else39         memcpy(lpData,bgr32,w*h*3);40     41     static int filecount=0;42     char filename[255];43     sprintf(filename,"C:\\%d.bmp",filecount);44     FILE *fp=fopen(filename,"wb");45 46     if(fp)47     {48          49         fwrite(&bfh,1,sizeof(BITMAPFILEHEADER),fp);50         fwrite(&bih,1,sizeof(BITMAPINFOHEADER),fp);51         fwrite(lpData,1,size,fp);52         fclose(fp);53         filecount++;54     }55     GlobalFree(lpData);56 57 }58 59 int main()60 {61     62     CaptureScreen myCapture;63     myCapture.ScreenInit();64     RECT dstRect={0,0,1920,1080};65     myCapture.ScreenSetWindow(&dstRect);66     BYTE *dstBuff = (BYTE*)malloc(myCapture.rWidth*myCapture.rHeight*3);67     int lastTime = timeGetTime();68     myCapture.ScreenCopy(dstBuff);69     printf("time:%dms",timeGetTime()-lastTime);70     SaveBmp2((BYTE*)dstBuff,myCapture.rWidth,myCapture.rHeight,0);71     myCapture.ScreenFree();72 73     74     return 0;75 }