writefile /readfile 提示无效句柄

 首先介绍下　这两个函数的原型：

BOOL ReadFile( HANDLE hFile , LPVOID lpBuffer , DWORD nNumberOfBytesToRead , LPDWORD lpNumberOfBytesRead , LPOVERLAPPED lpOverlapped );

BOOL WriteFile( HANDLE hFile, LPCVOID lpBuffer, DWORD nNumberOfBytesToWrite, LPDWORD lpNumberOfBytesWritten, LPOVERLAPPED lpOverlapped );

错误提示：　当进行读写数据时候，提示无效句柄

原因：　可能在某处不小心把句柄hFile，用CloseHandle给关闭了。