Base on recommendation from (v=vs.110).aspx I have replaced GetTempFileName with GetRandomFileName to get a name for the temp file. And it cause a problem. Sometimes GetRandomFileName return not a file name but location in System32 folder. And of cause users with no admin rights are having an error that file is not found. Do I missed anything?
Here is a code:
string tempFileName = Path.GetRandomFileName();
FileStream tempFileStream = null;
tempFileStream = File.Open(tempFileName, FileMode.Create, FileAccess.ReadWrite);
later on when I try to access that file by code:
FileInfo fileInfo = new FileInfo(tempFileName);
I have an error:
System.UnauthorizedAccessException: Access to the path 'C:\Windows\system32\25ddubwt.qsc' is denied.
I realised that when user initiate a program by using menu from Windows/Start button current directory for the application will be System32
1 Answer
GetTempFileName() returns a full path, GetRandomFileName() does not.
If you assume GetRandomFileName() has a path and write to it the file may well end up in System32 if thats the current directory.
To fix create a full path:
string fname = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
