Graham Labdon schreef op 23-2-2015 om 10:48:
> Hi
>
> I am trying to use QLockFile in a function that receives a file path as a
> QString.
>
> When I pass the string directly to the constructor of QLockFile and the call
> tryLock it always fails.
>
> However, if I hard code the string the lock succeeds (although I get compiler
> warnings about unknown escape sequences)
>
> If I user the toNativeSeparators method of QDir on my file path the call to
> tryLock fails although in the debugger the value of the converted string
> appears to the same as the hard coded value.
>
> I would be grateful if someone could explain this behaviour
>
> FileDestination::FileDestination(const QString& filePath)
> {
> QLockFile lockFile(filePath); // tryLock fails
>
> QString s = QDir::toNativeSeparators(filePath)
> QLockFile lockFile2(s); // tryLock fails
>
> QLockFile lockFile3("C:\jobs\Myjob.txt"); // tryLock succeeds bu get
> compiler warnings for unknown escape sequences
> }
The last one is not valid. A \ in a C/C++ string is an escape character.
If you want a literal \ in your string, you need to double them. Or, in
Qt, you just use forward slashes (/) on all platforms.
So, are you sure your filePath itself is valid?
André
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