Question

CFile 共享违例，两个CFile如何同时读写

CFile file1("d:\\text.txt",CFile::modeWrite );
CFile file2("d:\\text.txt",CFile::modeRead);
如何写后面的标志位 才能保证file1在写的同时，file2能读？
谢谢各位。
CFile file1("d:\\text.txt",CFile::modeWrite | CFile::shareDenyRead );
CFile file2("d:\\text.txt",CFile::modeRead | CFile::shareDenyRead );
这个这样定义就要出错。

Answer 1

CFile file1("d:\\text.txt",CFile::modeWrite | CFile::shareDenyRead );
CFile file2("d:\\text.txt",CFile::modeRead | CFile::shareDenyRead );

补充：刚才写错了

CFile file1("d:\\text.txt",CFile::modeWrite | CFile::shareDenyWrite);
CFile file2("d:\\text.txt",CFile::modeRead | CFile::shareDenyRead );

Answer 2

CFile::shareDenyRead Opens the file and denies other processes read access to the file. Create fails if the file has been opened in compatibility mode or for read access by any other process.