rename file name

[weixj2003ld]

I use Qfile to open and rename a file,but I can not rename it.

QFile file("..\\..\\media\\terrain.cfg");
 file.open(QIODevice::WriteOnly|QIODevice::Text);
...
file.rename("tmp.cfg");// it always return fasle.

QFile file("..\\..\\media\\terrain.cfg");
 file.open(QIODevice::WriteOnly|QIODevice::Text);
...
file.rename("tmp.cfg");// it always return fasle.

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