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PathCombine (shlwapi)
TODO - a short description

C# Signature:

[DllImport("shlwapi.dll", CharSet=CharSet.Auto)]
static extern string PathCombine([Out] StringBuilder lpszDest, string lpszDir, string lpszFile);

VB.NET Signature

Declare Unicode Function PathCombine Lib "shlwapi.dll" Alias "PathCombineW" (<MarshalAs(UnmanagedType.LPTStr)> PathOut As System.Text.StringBuilder, <MarshalAs(UnmanagedType.LPTStr)> PathIn As String, <MarshalAs(UnmanagedType.LPTStr)> More As String) As IntPtr

VB Signature:

Declare Function PathCombine Lib "shlwapi.dll" Alias "PathCombineA" (ByVal szDest As String, ByVal lpszDir As String, ByVal lpszFile As String) As Long


This is similar, but not identical, to PathAppend and Path.Combine. For example, combining "C:\foo" with "\bar" yields "C:\bar" rather than "C:\foo\bar" or "\bar" respectively.

Current signature is incorrect, because return value is string and CLR trying to release the same string twice (return value and lpszDest). I have unxpected crashes. I think that type of return value should change to IntPtr. This page contains some discussion about this problem:

Tips & Tricks:

Please add some!

Sample Code:

    [DllImport("shlwapi.dll", CharSet = CharSet.Auto)]
    static extern string PathCombine([Out] StringBuilder lpszDest, string lpszDir, string lpszFile);
    public static string GetAbsolutePath(string basePath, string relativePath)
        StringBuilder sb = new StringBuilder();
        return PathCombine(sb,basePath,relativePath);

    //nunit test case
    public void TestGetAbsolutePath()
        Assert.AreEqual(@"c:\abc\123.txt",IO.GetAbsolutePath(@"c:\abc\","123.txt"),"Test 1");
        Assert.AreEqual(@"c:\abc\123.txt", IO.GetAbsolutePath(@"c:\abc\efg\", @"..\123.txt"), "Test 1");


Alternative Managed API:



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