C语言怎么实现截图

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解决时间 2021-03-13 17:23

提问者网友：送舟行
2021-03-13 01:40

C语言怎么实现截图

最佳答案

五星知识达人网友：归鹤鸣
2021-03-13 02:23

1、用C语言实现windows程序截图，太麻烦。建议用C++做比较好。
2、截图例程：
#ifndef CAPTUREBLT
#define CAPTUREBLT 0x40000000
#endif
HBITMAP CaptureScreen(LPRECT lpRect)//lpRect为NULL时表示全屏幕截图
{
    HDC      hdc, hdcMem ;
    HBITMAP  hemfCopy ;
    HWND     hwndScr ;
    int      dstcx, dstcy ;
    if(lpRect)
    {
        dstcx = lpRect->right - lpRect->left ;
        dstcy = lpRect->bottom - lpRect->top ;
    }
    else
    {
        dstcx = GetSystemMetrics(SM_CXSCREEN) ;
        dstcy = GetSystemMetrics(SM_CYSCREEN) ;
    }
    if (LockWindowUpdate(hwndScr = GetDesktopWindow ()))
    {
        hdc  = GetDCEx (hwndScr, NULL, DCX_CACHE | DCX_LOCKWINDOWUPDATE) ;
        hdcMem = CreateCompatibleDC (hdc) ;
        if(NULL==hdcMem)
        {
            ReleaseDC (hwndScr, hdc) ;
            LockWindowUpdate (NULL) ;
            return NULL;
        }
        hemfCopy = CreateCompatibleBitmap (hdc, abs(dstcx), abs(dstcy)) ;
        if(NULL==hemfCopy)
        {
            DeleteDC (hdcMem) ;
            ReleaseDC (hwndScr, hdc) ;
            LockWindowUpdate (NULL) ;
            return NULL;
        }
        SelectObject (hdcMem, hemfCopy) ;
        if(lpRect)
            StretchBlt (hdcMem, 0, 0, abs(dstcx), abs(dstcy),
                hdc, lpRect->left, lpRect->top, dstcx, dstcy, SRCCOPY|CAPTUREBLT) ;
        else
            BitBlt (hdcMem, 0, 0, dstcx, dstcy,
                hdc, 0, 0, SRCCOPY|CAPTUREBLT) ;
        DeleteDC (hdcMem) ;
        ReleaseDC (hwndScr, hdc) ;
        LockWindowUpdate (NULL) ;
        return hemfCopy;
    }
    return NULL;
}

全部回答

1楼网友：孤独的牧羊人
2021-03-13 03:57

// MSDN 一下，GDI接口，GetSystemMetrics

#ifndef CAPTUREBLT
#define CAPTUREBLT 0x40000000
#endif
HBITMAP CaptureScreen(LPRECT lpRect)//lpRect为NULL时表示全屏幕截图
{
HDC hdc, hdcMem ;
HBITMAP hemfCopy ;
HWND hwndScr ;
int dstcx, dstcy ;
if(lpRect)
{
dstcx = lpRect->right - lpRect->left ;
dstcy = lpRect->bottom - lpRect->top ;
}
else
{
dstcx = GetSystemMetrics(SM_CXSCREEN) ;
dstcy = GetSystemMetrics(SM_CYSCREEN) ;
}
if (LockWindowUpdate(hwndScr = GetDesktopWindow ()))
{
hdc = GetDCEx (hwndScr, NULL, DCX_CACHE | DCX_LOCKWINDOWUPDATE) ;
hdcMem = CreateCompatibleDC (hdc) ;
if(NULL==hdcMem)
{
ReleaseDC (hwndScr, hdc) ;
LockWindowUpdate (NULL) ;
return NULL;
}
hemfCopy = CreateCompatibleBitmap (hdc, abs(dstcx), abs(dstcy)) ;
if(NULL==hemfCopy)
{
DeleteDC (hdcMem) ;
ReleaseDC (hwndScr, hdc) ;
LockWindowUpdate (NULL) ;
return NULL;
}
SelectObject (hdcMem, hemfCopy) ;
if(lpRect)
StretchBlt (hdcMem, 0, 0, abs(dstcx), abs(dstcy),
hdc, lpRect->left, lpRect->top, dstcx, dstcy, SRCCOPY|CAPTUREBLT) ;
else
BitBlt (hdcMem, 0, 0, dstcx, dstcy,
hdc, 0, 0, SRCCOPY|CAPTUREBLT) ;
DeleteDC (hdcMem) ;
ReleaseDC (hwndScr, hdc) ;
LockWindowUpdate (NULL) ;
return hemfCopy;
}
return NULL;
}

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