在 XP 中从隐藏或剪切的窗口复制内容? [英] Copying content from a hidden or clipped window in XP?

问题描述

我需要将隐藏的窗口 (BitBlt) 的内容复制到另一个窗口.问题是一旦我隐藏了源窗口，我得到的设备上下文就不再绘制了.

I need to copy the content of a window (BitBlt) which is hidden, to another window. The problem is that once I hide the source window, the device context I got isn't painted anymore.

推荐答案

您需要的是 PrintWindow 函数.如果您需要它与旧版本的 Windows 一起使用，您可以尝试 WM_PRINT，虽然我一直无法让它发挥作用.

What you need is the PrintWindow function that's available in Win32 API since Windows XP. If you need it to work with older versions of Windows, you can try WM_PRINT, although I've never been able to make it work.

有一篇很好的文章这里 展示了如何使用 PrintWindow，这是该文章中的相关代码片段:

There's a nice article here that shows how to use PrintWindow, and here's the relevant code snippet from that article:

// Takes a snapshot of the window hwnd, stored in the memory device context hdcMem
HDC hdc = GetWindowDC(hwnd);
if (hdc)
{
    HDC hdcMem = CreateCompatibleDC(hdc);
    if (hdcMem)
    {
        RECT rc;
        GetWindowRect(hwnd, &rc);

        HBITMAP hbitmap = CreateCompatibleBitmap(hdc, RECTWIDTH(rc), RECTHEIGHT(rc));
        if (hbitmap)
        {
            SelectObject(hdcMem, hbitmap);

            PrintWindow(hwnd, hdcMem, 0);

            DeleteObject(hbitmap);
        }
        DeleteObject(hdcMem);
    }
    ReleaseDC(hwnd, hdc);
}

我应该有一些使用 wxPython 来实现相同功能的 Python 代码.如果需要，请给我留言.

I should have some Python code that uses wxPython to achieve the same thing. Drop me a note if you want it.

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