eg.

?StringListCopy@@$$J0YAHPAPAUStringListType_s@@0@Z

into:

int __cdecl StringListCopy(struct StringListType_s * *,struct StringListType_s * *)

C++ Signature:

    DWORD WINAPI UnDecorateSymbolName(
      __in   PCTSTR DecoratedName,
      __out  PTSTR UnDecoratedName,
      __in   DWORD UndecoratedLength,
      __in   DWORD Flags
    );

C# Signature:

    [Flags]
    enum UnDecorateFlags
    {
        UNDNAME_COMPLETE         = (0x0000),  // Enable full undecoration
        UNDNAME_NO_LEADING_UNDERSCORES   = (0x0001),  // Remove leading underscores from MS extended keywords
        UNDNAME_NO_MS_KEYWORDS       = (0x0002),  // Disable expansion of MS extended keywords
        UNDNAME_NO_FUNCTION_RETURNS      = (0x0004),  // Disable expansion of return type for primary declaration
        UNDNAME_NO_ALLOCATION_MODEL      = (0x0008),  // Disable expansion of the declaration model
        UNDNAME_NO_ALLOCATION_LANGUAGE   = (0x0010),  // Disable expansion of the declaration language specifier
        UNDNAME_NO_MS_THISTYPE       = (0x0020),  // NYI Disable expansion of MS keywords on the 'this' type for primary declaration
        UNDNAME_NO_CV_THISTYPE       = (0x0040),  // NYI Disable expansion of CV modifiers on the 'this' type for primary declaration
        UNDNAME_NO_THISTYPE          = (0x0060),  // Disable all modifiers on the 'this' type
        UNDNAME_NO_ACCESS_SPECIFIERS     = (0x0080),  // Disable expansion of access specifiers for members
        UNDNAME_NO_THROW_SIGNATURES      = (0x0100),  // Disable expansion of 'throw-signatures' for functions and pointers to functions
        UNDNAME_NO_MEMBER_TYPE       = (0x0200),  // Disable expansion of 'static' or 'virtual'ness of members
        UNDNAME_NO_RETURN_UDT_MODEL      = (0x0400),  // Disable expansion of MS model for UDT returns
        UNDNAME_32_BIT_DECODE        = (0x0800),  // Undecorate 32-bit decorated names
        UNDNAME_NAME_ONLY        = (0x1000),  // Crack only the name for primary declaration;
                              // return just [scope::]name.  Does expand template params
        UNDNAME_NO_ARGUMENTS         = (0x2000),  // Don't undecorate arguments to function
        UNDNAME_NO_SPECIAL_SYMS      = (0x4000),  // Don't undecorate special names (v-table, vcall, vector xxx, metatype, etc)
    }

    [DllImport("dbghelp.dll", SetLastError=true, PreserveSig=true)]
    static extern int UnDecorateSymbolName(
        [In] [MarshalAs(UnmanagedType.LPStr)] string DecoratedName,
        [Out] StringBuilder UnDecoratedName,
        [In] [MarshalAs(UnmanagedType.U4)] int UndecoratedLength,
        [In] [MarshalAs(UnmanagedType.U4)] UnDecorateFlags Flags);

VB Signature:

User-Defined Types:

None.

Alternative Managed API:

Notes:

None.

Tips & Tricks:

Sample Code:

StringBuilder builder = new StringBuilder(255);
UnDecorateSymbolName("Mangled String", builder, builder.Capacity, UnDecorateFlags.UNDNAME_COMPLETE);