Temporary Files
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This file helps generate a suitable temporary file name and ensure it is deleted after use.

CAutoDeletePath is an RAII object derived from CString which, if it's holding a path to a file or folder, will delete that file or folder when the CAutoDeletePath goes out of scope.

CTempPath creates a unique Temporary File Name from a Template.
The file can optionally be AutoDeleted when the CTempPath goes out of scope
The printf-style Template should use an integer parameter (%04d):
Save(CTempPath("PXBF%04d.X_B"));
This would produce a file-name like:
"C:\DOCUME~1\rjm\LOCALS~1\Temp\PXBF0021.X_B"
You must provide a template to describe the whole File Name, or it can't know if it's generating a duplicate!

ValidateTempFolder makes sure a temporary folder exists and is writeable (yes, I've had customers who had no access to their system temp folder).

It's worth pointing out that Windows has a flag specifically for making temporary files fast: FILE_ATTRIBUTE_TEMPORARY. If you use CreateFile with this flag, the file isn't flushed to the disk unless you run out of RAM, so if you're writing a small temp file and about to read it back in elsewhere, this is a fast option. It has been used where several third-party software modules were working on file data sequentially.

  CTempPath oPath("MyApp%04d.tmp");
  HANDLE oFile=CreateFile(oPath, GENERIC_WRITE, 0, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_ATTRIBUTE_TEMPORARY, 0);
  if(oFile) {
    ...fill the temp file
    CloseHandle(oFile);
    ...now some other process can open it and use it without it having been written to disk.
  }

You can also use the flag FILE_FLAG_DELETE_ON_CLOSE instead of using CTempPath's AutoDelete if you are using CreateFile.

TempPath.h uses LocalPath.h


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 (1377) Last modified: Fri, 15 May 2009 15:27:44 +0100