[Solved] WINAPI IsWindow return false [closed]

Question

Are you sure you have the correct handle value? Assuming your thread is on the same desktop as the other window it is guaranteed to work correctly. If it returns false then the HWND is not valid because A) your HWND variable contains a numerical value that is not a valid HWND, or B) timing issues where the window is destroyed while you are calling the function.

Accepted Answer

Are you sure you have the correct handle value? Assuming your thread is on the same desktop as the other window it is guaranteed to work correctly. If it returns false then the HWND is not valid because A) your HWND variable contains a numerical value that is not a valid HWND, or B) timing issues where the window is destroyed while you are calling the function.