文件读写

void CMy12View::OnFileWrite() {// TODO: Add your command handler code here    /*char ch[]="ADFADAKLDJFKLANSDFA";CFile file("1.txt",CFile::modeReadWrite|CFile::modeCreate);file.Write(ch,sizeof(ch));file.SeekToBegin();*///句柄/*HANDLE hFile;hFile=CreateFile("1.txt", GENERIC_WRITE,0,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED,NULL );DWORD dwWrites;WriteFile(hFile,"asdfasdfasdf",sizeof("asdfasdfasdf"),&dwWrites,NULL);CloseHandle(hFile);*/}void CMy12View::OnFileRead() {// TODO: Add your command handler code here    /*BYTE buf[0x1000];CFile file;file.Open("1.txt",CFile::modeReadWrite);DWORD dwBytesRemaining=file.GetLength();while(dwBytesRemaining){DWORD dwPosition=file.GetPosition();UINT nByeteRead=file.Read(buf,sizeof(buf));::CharLowerBuff((char *)buf,nByeteRead);file.Seek(dwPosition,CFile::begin);file.Write(buf,nByeteRead);dwBytesRemaining=nByeteRead;}MessageBox((char *)buf);file.Close();*/HANDLE hFile;hFile=CreateFile("1.txt",GENERIC_READ,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);char chr[100];memset(chr,0,sizeof(char)*100);//这一句写不写结果都一样    DWORD dwRead;ReadFile(hFile,chr,100,&dwRead,NULL);chr[dwRead]=0;CloseHandle(hFile);MessageBox(chr);}