If the target window is owned by the current process, GetWindowText causes a WMGETTEXT message to be sent to the specified window or control.
#C++ getwindowtext code
Now, since your C++ code is already Windows-specific, that should not be a problem.Īnd, anyway, IMO the standard should be fixed to allow something like overwriting the terminating NUL with another NUL a valid well-defined operation. When working with RAPI for Windows CE 1.0 and 1.01, use the PegGetWindowText function. However, it seems to work just fine in Visual Studio (tested on both 20).
However, note that overwriting the NUL terminator in STL strings with another NUL terminator seems to be "undefined behavior", at least according to this discussion on Stack""
Im not a C person but it looks correct from a C/C++ perspective. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors. public static extern void GetWindowText(IntPtr hWnd, StringBuilder lpString. This approach is more efficient than having a separate std::vector for buffer allocation, with a separate dynamic memory allocation, and then a deep-copy into the std::wstring. The winuser.h header defines SetWindowText as an alias which automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. However, you have to pass the whole destination buffer length (*including* the terminating NUL) to GetWindowText() as third parameter. Note that the length value returned by GetWindowTextLength() excludes the terminating NUL. Str.resize(len) // make enough room in string Something like this: int len = GetWindowTextLength(hwnd) This is particularly true of the task switcher scenario. It should not be possible for a hung application to clog up other applications. Task-switching applications need to get window text so they can display the window title in the switcher window. Then how are you supposed to get any window text ?Īn option would be to make enough room inside the string for storing text in it. FindWindow () needs to get window text in order to find a window.
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