如何正确获取窗口标题

Question

can I do the following to get the window's title of the another application

char window_text[256];
LRESULT lResult = SendMessageA(pMouseHook->hwnd, WM_GETTEXT, sizeof(window_text) / sizeof(*window_text), (LPARAM)window_text);
printf("Copied %d characters. Contents: %s\n", lResult, window_text);

or should I first allocate the global memory and use it instead of the local char array?

Thanks in advance.

Answer 1

It's perfectly fine to use a local character array. Of course, if the title is longer than the buffer you provide then the returned value will be truncated.

For a window is a different process you might consider GetWindowText instead. The documentation says:

If the target window is owned by the current process, GetWindowText causes a WM_GETTEXT message to be sent to the specified window or control. If the target window is owned by another process and has a caption, GetWindowText retrieves the window caption text. If the window does not have a caption, the return value is a null string. This behavior is by design. It allows applications to call GetWindowText without becoming unresponsive if the process that owns the target window is not responding. However, if the target window is not responding and it belongs to the calling application, GetWindowText will cause the calling application to become unresponsive.