• windows API 实现截图


    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");   
    }


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  • 原文地址:https://www.cnblogs.com/bhlsheji/p/5352608.html
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