Restrict user to open the same file

**wysota** · 22nd May 2007, 13:19

Seems it won't be that easy. You'd probably have to dig into the base class and find a way to initialise the object properly. It'd be much faster if you got rid of C++ streams and used stdio or if you used Qt streaming classes and files.

**vermarajeev** · 22nd May 2007, 13:27

Originally Posted by wysota

Seems it won't be that easy. You'd probably have to dig into the base class and find a way to initialise the object properly.

But the same constructor works fine on windows. According to me since it is a C++ stream, it should work.

Qt Code:

Switch view

It'd be much faster if you got rid of C++ streams and used stdio or if you used Qt streaming classes and files.

It'd be much faster if you got rid of C++ streams and used stdio or if you used Qt streaming classes and files.

To copy to clipboard, switch view to plain text mode

But then I need to change a lot of code then and you know it is really overhead.

There has to be some way...Isnt it???

**wysota** · 22nd May 2007, 14:25

Sure there is a way. Dig into ios::base and find a way to use your FILE* as the appropriate buffer for the stream. That's quite time consuming, so that's why I suggested to find an alternative. Substituting using Qt streams should be quite quick using search&replace tools.

**vermarajeev** · 24th May 2007, 10:27

Originally Posted by wysota

Sure there is a way. Dig into ios::base and find a way to use your FILE* as the appropriate buffer for the stream. That's quite time consuming, so that's why I suggested to find an alternative. Substituting using Qt streams should be quite quick using search&replace tools.

OH!!! File locking doesnt work on windows. I'm surprised..Might be i'm doing somethig wrong..

Firstly

Qt Code:

Switch view

void _lock_file(
   FILE* file
);

void _lock_file(
   FILE* file
);

To copy to clipboard, switch view to plain text mode

doesnt work on Microsoft Visual Studio .NET 2003. It works on only Microsoft Visual Studio 2005/.NET Framework 2.0.

I use Microsoft Visual Studio .NET 2003. Can people there tell me how to lock a file on windows (Microsoft Visual Studio .NET 2003 ) such that, it should be shared locking not exclusive. i.e the file should be locked to prevent other processes to read the same file.

Thanks.
Marcel, looking for some other links...
Thanks