ReadFileEx方法读文件,为何回调函数没被触发?
不知道为什么FileIOCompletionRoutine函数没进去,代码如下:

C/C++ code

#include<iostream>#include<string>#include<Windows.h>using namespace std;VOID CALLBACK FileIOCompletionRoutine(DWORD dwErrorCode,DWORD dwNumberOfBytesTransfered,LPOVERLAPPED lpOverlapped){ cout<<"enter call back"<<endl;}int main(void){    HANDLE hEvent=NULL;    HANDLE hFile=NULL;    const int buffSize=512;         char *dataBuffer=new  char[buffSize];        hFile = CreateFile(                TEXT("a.txt"),                     GENERIC_READ,                        0,                                 NULL,                               OPEN_EXISTING,                          FILE_FLAG_OVERLAPPED,                  NULL              );                  if(hFile==INVALID_HANDLE_VALUE)   return 0;  hEvent=CreateEvent(NULL,true,false,NULL);  if(hEvent==NULL) return 0;       OVERLAPPED ovlap;    ZeroMemory(&ovlap,sizeof(ovlap));    ovlap.hEvent=hEvent;       bool  fNotEnd=ReadFileEx            (                hFile,                           dataBuffer,                     buffSize,                  &ovlap,               (LPOVERLAPPED_COMPLETION_ROUTINE)  FileIOCompletionRoutine            );       while(true)       {       cout<<"loop"<<endl;        Sleep(1000);       }   return 0;}

请教高手,不知道哪里写的不对?还是我对ReadFileEx用法理解有误?

[解决办法]
Sleep(1000);
-->
SleepEx(1000, TRUE);