I'am trying to get the text outputing by ExtTextOutW function, and the first thing that i came up with is, that go and hook this function, for example by injecting dll in the target process. So from there i can get the hdc, text and flags. However, i have the application that calls this function many many times, so i don't want to hook and make checks for all the calls. Is there a way, i can get the text printed on form by ExtTextOutW without hooking it, maybe using the hdc where it outputs the data?
Get text drawn by ExtTextOut
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Hooking is the only way you can get the parameter data that is being passed to
ExtTextOutW(). If you are only interested in data for a specificHDC, you will have to filter accordingly. However,HDCs tend to be created dynamically when needed, so you likely cannot filter on the actualHDCvalue itself, as it will be different each time. Fortunately, if theHDCbelongs to a window (and it sounds like you want to intercept calls for a specific window), you can useWindowFromDC()to get theHWNDof theHDCthat is being drawn on, and then filter on that as needed.