文件操作

（1）C函数：
        fopen,fwrite,fread,fflush,fclose,fseek,ftell。(可参考：http://blog.youkuaiyun.com/andylin02/archive/2007/03/12/1526554.aspx)

----------------例子------------------------------------------------
        FILE *pFile=fopen("1.txt","w");

        fwrite("content",1,strlen("content"),pFile);
        fflush();

        char chArr[100];
        memset(chArr,0,100);
        fread(chArr,1,100,pFile);
        fclose();
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（2）C++：(应用较少)
        ofstream(...), write, read, close。(fstream.h)

----------------例子------------------------------------------------
        ofstream ofs("1.txt");
        ofs.write("content");
        ofs.close();

        ifstream ifs("1.txt");
        char chArr[100];
        memset(chArr,0,100);
        ifs.read(chArr,100);
        ifs.close();
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（3）Win32 API：
        CreateFile，WriteFile，ReadFile，CloseHandle。

----------------例子------------------------------------------------
        HANDLE hFile;
        hFile=CreateFile("1.txt",GENERIC_WRITE,0,NULL,CREATE_NEW,FILE_ATTRIBUTE_NORMAL,NULL);
        DWORD dwWrites; //接收实际写入的字节数。
        WriteFile(hFile, "content" ,strlen("content"), dwWrites, NULL);
        CloseHandle(hFile);

        hFile=CreateFile("1.txt", GENERIC_READ, 0, NULL, OPEN_EXSITING, FILE_ATTRIBUTE_NORMAL, NULL);
        char chArr[100];
        DWORD dwReads;
        memset(chArr, 0, 100);
        ReadFile(hFile, chArr, 100, &dwReads, NULL);
        CloseHandle(hFile);
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（4）MFC：（常用）
        CFile，Write，Read，Close，SeekToBegin，SeekToEnd，GetLength，。

----------------例子------------------------------------------------
        CFile file("1.txt", CFile::modeCreate | CFile::modeWrite);
        file.Write("content", strlen("content"));
        file.Close();

        CFile fileR("1.txt", CFile::modeRead);
        DWORD dwFileLen=fileR.GetLength();
        char *pBuf=new char[dwFileLen+1];
        pBuf[dwFileLen]=0;
        fileR.Read(pBuf, dwFileLen);
        fileR.Close();
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