SetWindowDisplayAffinity 在 MFC 中不起作用 windows

Question

我有 1 个图片控制，想把它不能录屏。
在 .Net 中，我一直在使用 SetWindowDisplayAffinity:

WDA_MONTOR = 1;
SetWindowDisplayAffinity(this.Handle, WDA_MONTOR);

现在我已经转移到 MFC 以获得原生性能。
我正在使用以下代码，它不会阻止 screenshots:

HWND Handle = this->GetDlgItem(IDC_SCREEN)->m_hWnd;
SetWindowDisplayAffinity(Handle, WDA_MONITOR);

完整示例：

if(SetWindowDisplayAffinity(hWnd, WDA_MONITOR)==false)
{
    wchar_t buf[256];
    FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
        NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
        buf, (sizeof(buf) / sizeof(wchar_t)), NULL);
    AfxMessageBox(buf);
}

GetLastError 说“参数不正确”。

Answer 1

根据:

The .NET version was passing the form's window handle (a top-level window), but your MFC version is passing a control's window handle (a child window). Use the top-level window.

这意味着我必须使用 Form 句柄而不是 PictureBox 句柄。所以改变

HWND Handle = this->GetDlgItem(IDC_SCREEN)->m_hWnd; //PictureBox handle
SetWindowDisplayAffinity(Handle, WDA_MONITOR);

到

HWND Handle = this->m_hWnd;      //form handle
SetWindowDisplayAffinity(Handle, WDA_MONITOR);

原因：Form window 是 parent and top-level window.

SetWindowDisplayAffinity 在 MFC 中不起作用 windows

SetWindowDisplayAffinity not works in MFC windows

c++

windows

mfc

screenshot