实例：

（1）第一种方法CreateFile

复制代码 代码如下:

#include "stdafx.h"

#include <windows.h>

void main(int argc, char* argv[])

{

HANDLE hDevice = CreateFile("C://S.txt",

GENERIC_READ|GENERIC_WRITE,

0,

NULL,

OPEN_EXISTING,

FILE_ATTRIBUTE_NORMAL,

NULL);

if (hDevice == INVALID_HANDLE_VALUE)

{

printf("Failed to obtain file with %d error code !/n",GetLastError());

return;

}

DWORD dwSize = GetFileSize(hDevice,NULL);

printf("%d /n",dwSize);

char chBuffer[10] = "5469";

DWORD dwWriteSize = 0;

BOOL bRet = WriteFile(hDevice,chBuffer,4,&dwWriteSize,NULL);

if(bRet)

{

printf("write file success /n");

}

FlushFileBuffers(hDevice); //将缓冲区数据写入磁盘

LONG IDistance = 0;

DWORD dwPtr = SetFilePointer(hDevice,IDistance,NULL,FILE_BEGIN); //调整文件指针到文件开头

DWORD dwReadSize = 0;

bRet = ReadFile(hDevice,chBuffer,10,&dwReadSize,NULL);

if (bRet)

{

printf("chbuffer is %s /n",chBuffer);

}

CloseHandle(hDevice);

return ;

}

（2）第二种方法流文件操作FILE

复制代码 代码如下:

char datain[101];

FILE *fp_sys;

fp_sys = fopen("要打开的文件名", "rb"); //第二个参数为打开方法，r代表读，b代表二进制方式

if(fp_sys == NULL) {

AfxMessageBox("无法打开充值卡文件");