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Getwindowtext 21/6/2023 See this article on possibly handling these exceptions.ĭoes the sample code here work? You need to make sure the unmanaged code doesn't write past the end of the StringBuilder's buffer. This is happening because you are calling an unmanaged method which is writing past the end of a buffer. GetWindowText is an extremely small and portable utility that allows you to read almost all the window text, from Edit, Static, Groupbox - Controls, and more. These are the top rated real world C (Cpp) examples of GetWindowTextW extracted from open source projects. GetWindowTextW () is called with nMaxCount 3 and therefore writes 'AB\0' to the buffer and returns 2. C (Cpp) GetWindowTextW - 17 examples found. Meanwhile, the control text changes to 'ABC' (3 chars). The above message is from an AccessViolationException, which is a kind of corrupted state exception. GetWindowTextLengthW (hWnd) returns 1, so textLengthWithNullTerminator is 2. Net 4, managed code does not handle these exceptions by default. These kinds of exceptions can be very bad because the CLR cannot be sure that its own internal state is consistent and are sometimes called corrupted state exceptions. This mechanism is called structured exception handling. Another type is one delivered to the CLR via the windows OS. One type is StackOverflow or OutOfMemory because there is literally no memory to allocate for the handler to run. Uncomment the line where 'a' is declared as a TCHAR array - you were on the right track. You are passing an uninitialized pointer instead. There are some exceptions that cannot be caught. The second parameter of GetWindowText is supposed to point to a valid buffer (whose size is given by the third parameter).
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