?????????????????TA??TA???test automation?? ??????????????????????????????????????????????????????????С? ???????????????????????????????????????Щ?????????????????????????????????????????????????????????UI??????????Щ??????????????????????????????API??????????????????????????????????????????????????????????????????? ???е???Tooltip????????

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????????????????API Hook???????????????????????????????<<Windows??????>>??remoteThread???????????Detector.dll????????????????TA????????????????????TAUtil.dll??????????￡?

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????1??TA Tool????TAUtil.dll?? TAUtil.dll????????????

????2??TAUtil.dll?????????д???RemoteThread?? ?????????Detector.dll?? Detector.dll??Attatch???????????????

????3??TAUtil.dll???????Detector.dll?????????????????????????

????4??Detector.dll Hook ?滭?????API???????????????????????????????ж??Hook?????Detector.dll????????????????TAUtil.dll

????5??TAUtil.dll??????????????????.

?????????м????????????????????????????????????????????У???????????????? ????????ж?????????????????????????????WindowFromDC???ж????????????DC?????????API???????NULL?? ????????????????DC??????API???????????ж?????????????????????????????. ????????????????滭λ??????????DC?????????λ?á?windows?滭?????API????DrawTextA?? DrawTextW?? DrawTextExA?? DrawTextExW?? ExtTextOutA?? ExtTextOutW?? TabbedTextOutA?? TabbedTextOutW?? PolyTextOutA?? PolyTextOutW?? TextOutA?? TextOutW?? DC??????API????BitBlt??TransparentBlt??PatBlt??StretchBlt??.

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??????????????????????????????Windows????????????? Windows????????????????GDI Object?? User Object?? Kernel Object?? GDI Object????Bitmap?? Brush?? DC?? Pen ?????Щ?????y???????Ч?? User Object????HWND??HMENU?????Щ?????????????κν?????????????????????????? Kernel Object ?????????????????????????????Mutex??Event?????????????????????????????и???????????

??????????????????????????????????????????????????HMENU??????????????API???????????????????????????????ε??????????. ?????????API Hook ????????Hook ??API TrackPopupMenu??TrackPopupMenuEx??????? ??????????

????1????????????API Hook

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????3?????Hook ???????????ж??Hook

????4???????????API??????????????????

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