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POShort file names versus long file names in Windows
 

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  1. POShort file names versus long file names in Windows
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    <p>I have some code which gets the short name from a file path, using GetShortNameW(), and then later retrieves the long name view GetLongNameA().</p> <p>The original file is of the form</p> <pre><code>"C:/ProgramData/My Folder/File.ext" </code></pre> <p>However, following conversion to short, then back to long, the filename becomes</p> <pre><code>"C:/Program Files/My Folder/Filename.ext". </code></pre> <p>The short name is of the form</p> <pre><code>"C:/PROGRA~2/MY_FOL~1/FIL~1.EXT" </code></pre> <p>The short name is being incorrectly resolved.</p> <p>The code compiles using VS 2005 on Windows 7 (I cannot upgrade the project to VS2008)</p> <p>Does anybody have any idea why this might be happening?</p> <pre><code> DWORD pathLengthNeeded = ::GetShortPathNameW(aRef-&gt;GetFilePath().c_str(), NULL, 0); if(pathLengthNeeded != 0) { WCHAR* shortPath = new WCHAR[pathLengthNeeded]; DWORD newPathNameLength = ::GetShortPathNameW(aRef-&gt;GetFilePath().c_str(), shortPath, pathLengthNeeded); if(newPathNameLength != 0) { UI_STRING unicodePath(shortPath); std::string asciiPath = StringFromUserString(unicodePath); pathLengthNeeded = ::GetLongPathNameA(asciiPath.c_str(),NULL, 0); if(pathLengthNeeded != 0) {// convert it back to a long path if possible. For goodness sake can't we use Unicode throughout?F char* longPath = new char[pathLengthNeeded]; DWORD newPathNameLength = ::GetLongPathNameA(asciiPath.c_str(), longPath, pathLengthNeeded); if(newPathNameLength != 0) { std::string longPathString(longPath, newPathNameLength); asciiPath = longPathString; } delete [] longPath; } SetFullPathName(asciiPath); } delete [] shortPath; } </code></pre>
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    1. USDeanna
    1. USAlan Gorman
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      1. POShort file names versus long file names in Windows
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    1. COWhat is the output of `dir /x` for the directory containing that file?
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      1. POShort file names versus long file names in Windows
      1. USGreg Hewgill
    2. COIt is consistent with the short name given by GetShortPathName - C:\ProgramData\... maps to C:\PROGRA~2\..., and C:\Program Files\... maps to C:\PROGRA~1\... Converting the short name back to the long name, programatically via GetLongPathName, seems to resolve incorrectly.
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      1. POShort file names versus long file names in Windows
      1. USAlan Gorman
 

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