I can successfully send any single key message to an application, but I don't know how to send combinations of keys (like Ctrl+F12, Shift+F1, Ctrl+R, etc..)
尝试这样做：
SendMessage(handle, WM_KEYDOWN, Keys.Control, 0);
SendMessage(handle, WM_KEYDOWN, Keys.F12, 0);
SendMessage(handle, WM_KEYUP, Keys.F12, 0);
SendMessage(handle, WM_KEYUP, Keys.Control, 0);
but this does not seems to work (application acts like only F12 is pressed, not Ctrl+F12).
有什么想法可以让这项工作发挥作用吗？
You would probably find that using SendInput (documentation here) http://msdn.microsoft.com/en-us/library/windows/desktop/ms646310%28v=vs.85%29.aspx works a lot better. You will need to P/Invoke it from C#, example here http://www.pinvoke.net/default.aspx/user32.sendinput. You can provide arrays of data with keys down and up and properly set the other message parameters, for example whether left or right Ctrl/Shift/Alt were pressed.
You can also use the SendKeys class (documentation here http://msdn.microsoft.com/en-us/library/system.windows.forms.sendkeys.aspx). This allows you to specify keys by name, e.g., {^F12} for Ctrl+F12.
Edit：OP 现在说他需要将输入发送到最小化的应用程序而不激活它们。这是不可能可靠地做到的any way，甚至包括专门的硬件。我从事自动化工作。这是不可能的。 OP需要使用FindWindow/SetForegroundWindow打开目标应用程序，然后他可以切换回他的应用程序。
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