Office 2013如何为IRM实现黑色窗口? [英] How does Office 2013 implement black windows for IRM?

问题描述

我注意到，当在Outlook 2013中打开受IRM保护的电子邮件时，按PrntScrn时，将屏幕快照粘贴到mspaint中时，电子邮件窗口将替换为黑色实心矩形.

I noticed that when I press PrntScrn while an IRM-protected email is open in Outlook 2013, the email's window is replaced with a solid black rectangle when I paste the screenshot into mspaint.

我不知道任何截屏"窗口消息会发送到Windows，因此该功能如何实现?我的显示器上从未见过任何黑色像素，因此我认为它没有键盘钩来监听PrntScrn，然后将窗口涂成黑色.

I'm not aware of any "Screenshot" window message being sent to windows, so how is this feature implemented? I never see any black pixels on my monitors so I don't think it has a keyboard hook to listen for PrntScrn and then paints the window black.

推荐答案

使用WinAPI函数

Using the WinAPI function SetWindowDisplayAffinity with the WDA_MONITOR affinity before showing the window.

SetWindowDisplayAffinity(hwnd, WDA_MONITOR);  // Should, of course, check return value
ShowWindow(hwnd, SW_NORMAL);

请注意，这仅适用于Windows 7及更高版本，仅适用于某些公共操作系统功能和API"集，并且仅当该窗口是DWM合成的时才适用.请参阅链接文档的备注部分中的两段.

Note this only works in Windows 7 and higher, only for a certain set of "public operating system features and APIs", and only when the window is DWM-composited. See the two paragraphs in the Remarks section of the linked documentation.

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