file must be opened first 必须 先 打开文件 If you are using & konqueror;, do this instead: first , open a & konqueror; window and choose Settings Confi...
基于1个网页-相关网页
To read a file, the file must first be opened.
要读取一个文件，文件必须首先被打开。
These functions must be called after the stream has been opened(obviously, since each requires a valid file pointer as its first argument) but before any other operation is performed on the stream.
这些函数必须在流打开后被调用（很明显，因为每个函数都需要一个有效的文件指针作为它的第一个参数），但是在对流有任何操作之前。
应用推荐