?? main.cpp
字號:
#include <windows.h>
#include <stdio.h>
#define BUFFER_SIZE 512
//假設該文件大于或等于BUFFER_SIZE
#define DEVICE_NAME "test.dat"
int main()
{
HANDLE hDevice =
CreateFile("test.dat",
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED,//此處設置FILE_FLAG_OVERLAPPED
NULL );
if (hDevice == INVALID_HANDLE_VALUE)
{
printf("Read Error\n");
return 1;
}
UCHAR buffer[BUFFER_SIZE];
DWORD dwRead;
//初始化overlap使其內部全部為零
OVERLAPPED overlap={0};
//創建overlap事件
overlap.hEvent = CreateEvent(NULL,FALSE,FALSE,NULL);
//這里沒有設置OVERLAP參數,因此是異步操作
ReadFile(hDevice,buffer,BUFFER_SIZE,&dwRead,&overlap);
//做一些其他操作,這些操作會與讀設備并行執行
//等待讀設備結束
WaitForSingleObject(overlap.hEvent,INFINITE);
CloseHandle(hDevice);
return 0;
}
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