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POFinding unique path name for a given input
 

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    <p>I'm working on a problem where I need to have a way to convert a user inputted filename to a unique path name. Let's say I let the user specify a path name that points to a file that contains some data. I can then do <code>Data* pData=Open(PathName)</code>. Now if the user specifies the same path name again, I'd like to be able to have a table of already opened files and just return a pointer to the same data: <code>Data* pData2=GetOpenedData(PathName)</code>. This is easy to accomplish with a simple <code>std::map&lt;std::string,Data*&gt;</code>, the problem is that different values of <code>PathName</code> can point to the same file. The simplest case is on Windows case insensitivity comes into play. </p> <p>The code is cross platform C++ and I don't have access to .NET stuff (but I'm happy to <code>#ifdef</code> the differences between Windows and UNIX if needed). Does anyone know of either Windows API or POSIX functions that can take a path name and return a unique (to the system) string that I can key off of. The key doesn't have to be the same in both systems (Windows/POSIX), just unique within a running instance of my code.</p> <p>For now, I'm not worried about links or two ways to get to the same file. Such as in Windows, if I had \myserver\share mapped to S: then \myserver\share\blah and S:\blah are the same file, but I can live with those being thought of as different. But S:\blah and S:\Blah should be the same. If there is a way to make \myserver\share and S:\ also be unique, that's a bonus and I'd be really happy, but I can live without it. (Likewise, if there are multiple links to the same file in UNIX).</p> <p>Edited to add:</p> <p>It's not as simple as just doing a case insensitive search in windows. For example: <code>c://data/mydata.dat</code> while that's an "invalid" filename, windows will accept it and it will actualy point to <code>c:\data\mydata.dat</code></p> <p>Edited to add another thing:</p> <p>I'd also like <code>c:\mydirectory\..\blah.dat</code> to be recognized at the same as <code>c:\blah.dat</code> </p>
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