This projects provides a PowerShell script to wrap invocation of native windows application suffering from max path length limitation when working with very long directory and filenames.
Notable examples of command line programs failing to work with long filenames :
- Poppler pdftocairo, for PDF to PNG conversion
- Poppler pdf2svg, for PDF to SVG conversion
- SWFTools PDF2SWF, for PDF to SWF conversion
- ImageMagick convert, for image manipulation such as thumbnail generation
Usage
Duplicate winwrapper.ps1 and edit to change the command to be executed.
The script receives 2 required and 2 optionals parameters,in the following order, to match the common uses of the aboved mention programs :
- input filename
- output filename
- width (for use during thumbnail creation)
- height (for use during thumbnail creation)
You may invoke the wrapper from a Java program by using the following command in a Process invocation :
"C:/Windows/System32/cmd.exe" /c echo . |"C:/Windows/System32/WindowsPowerShell/v1.0/powershell.exe" -ExecutionPolicy Bypass -File "c:/WindowsWrapper/winwrapper.ps1" "c:/long/path/to/in.src" "c:/long/path/to/out.dest"
Implementation
In order to workaround the maxpath filename limitations, this script perform the following steps :
- computes 2 temporary filename (with a short filename since they are generated using native windows API) :
- one for the temporary input file
- one for the temporary outpule file (using the same extension as the specified outputfile)
- copies the input file to the temporary input file (*)
- invokes the native command using the temporary "short" files
- move the temporary output file to the temporary input file (*)
- delete the temporary input file
(*) using Microsoft Experimental IO to support long filename)
Additional resources