如何在 C++ 中将窗口的屏幕截图作为位图对象获取？
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How to get screenshot of a window as bitmap object in C++?
提问by jondinham
How to get screenshot of a window as bitmap object in C++? Supposed that I already have the window handle. And I want to know also whether it's possible to get the screenshot of a window when it's in minimized state?
如何在 C++ 中将窗口的屏幕截图作为位图对象获取？假设我已经有了窗口句柄。而且我还想知道是否可以在窗口处于最小化状态时获得它的屏幕截图？
C++ here means VC++ with all the libraries associated with Windows XP+ (win32).
C++ 在这里是指 VC++ 以及与 Windows XP+ (win32) 相关的所有库。
回答by Davide Piras
you should call the PrintWindow API:
您应该调用 PrintWindow API：
void CScreenShotDlg::OnPaint()
{
// device context for painting
CPaintDC dc(this);
// Get the window handle of calculator application.
HWND hWnd = ::FindWindow( 0, _T( "Calculator" ));
// Take screenshot.
PrintWindow( hWnd,
dc.GetSafeHdc(),
0 );
}
see this question: getting window screenshot windows API
看到这个问题：获取窗口截图 windows API
if you are not using MFC, here the pure PrintWindow signature:
如果您不使用 MFC，这里是纯 PrintWindow 签名：
BOOL PrintWindow(
HWND hwnd,
HDC hdcBlt,
UINT nFlags
);
see MSDN for more details: http://msdn.microsoft.com/en-us/library/dd162869(v=vs.85).aspx
有关更多详细信息，请参阅 MSDN：http: //msdn.microsoft.com/en-us/library/dd162869(v=vs.85).aspx
about how to save it as bitmap asMatteo said depends on the actual framework you are using...
关于如何将其保存为位图，正如 Matteo 所说，取决于您使用的实际框架......
EDIT:
编辑：
here full example in raw C++
这里是原始 C++ 中的完整示例
#define _WIN32_WINNT 0x0501 //xp
#include <windows.h>
int main()
{
RECT rc;
HWND hwnd = FindWindow(TEXT("Notepad"), NULL); //the window can't be min
if (hwnd == NULL)
{
cout << "it can't find any 'note' window" << endl;
return 0;
}
GetClientRect(hwnd, &rc);
//create
HDC hdcScreen = GetDC(NULL);
HDC hdc = CreateCompatibleDC(hdcScreen);
HBITMAP hbmp = CreateCompatibleBitmap(hdcScreen,
rc.right - rc.left, rc.bottom - rc.top);
SelectObject(hdc, hbmp);
//Print to memory hdc
PrintWindow(hwnd, hdc, PW_CLIENTONLY);
//copy to clipboard
OpenClipboard(NULL);
EmptyClipboard();
SetClipboardData(CF_BITMAP, hbmp);
CloseClipboard();
//release
DeleteDC(hdc);
DeleteObject(hbmp);
ReleaseDC(NULL, hdcScreen);
cout << "success copy to clipboard, please paste it to the 'mspaint'" << endl;
return 0;
}
回答by Ond?ej Vykouk
If anybody is interested in getting PrintWindow picture of minimized window, here you can get the idea, how to get the thing done: http://www.codeproject.com/Articles/20651/Capturing-Minimized-Window-A-Kid-s-Trick
如果有人有兴趣获得最小化窗口的 PrintWindow 图片，您可以在这里了解如何完成这项工作：http: //www.codeproject.com/Articles/20651/Capturing-Minimized-Window-A-Kid-特技
Happy coding;)
快乐编码;)
回答by vik_78
Looks like PrintWindow is working with frontbuffer. I tried to take an IE screenshot. Open new a link, and try to get the picture. It will show the picture from the previous link.
看起来 PrintWindow 正在使用前端缓冲区。我尝试截取 IE 屏幕截图。打开新链接，并尝试获取图片。它将显示上一个链接中的图片。
