[問題] Win32 API WriteFile() with Overlapped IO
若是不能問Win32 API 請告之我會自刪!!
問題:
使用Asynchromous I/O to read/write file in Win32.
先CreateFile(..,FILE_FLAG_OVERLAPPED,...)
如果欲呼叫WriteFile(...,number2Send, &bytesWritten,&Overlapp_HANDLE)
請問
(Write會PENDING)
1.WriteFile()一call會馬上return FALSE, 然後我們再用GetLastError()去
檢查是否為ERROR_IO_PENDING, then 等待IO completion.這時&bytesWritten
是否為無意義??
(Write不會PENDING)
2.如果一WriteFile()馬上成功, 是否就會return TRUE呢? 那&bytesWritten
就是write出去的bytes 數?
我目前觀念是以為如果一CreateFile()為Overlapped, 永遠就是一呼叫WriteFile()
就是馬上return FALSE, 然後在去做後續處理.
感謝回答指導.
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