Posted By

pckujawa on 02/23/09

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c Net csharp

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Pass a string from C# to a C++ DLL in .NET (and get a pointer to the string's chars)

/ Published in: C#

Specifically, this code enables you to pass a string from C# into C++ managed code and then get a C++ pointer to the string's chars.

Marshal.StringToHGlobalAnsi Method from MSDN.

Good information about native vs. managed types.

Related forum post.

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C#
void cSharpMethod() {
    String myString = "ASCII/ANSI String in C#";
    cPlusPlusClass.cPlusPlusMethod(myString);
}
 
C++
int cPlusPlusMethod(System::String^ aString) {
    char* charPtr = (char*)Marshal::StringToHGlobalAnsi(aString).ToPointer();
    // Use it...
    Marshal::FreeHGlobal(IntPtr(charPtr)); // Free memory
}

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Posted By: dadajay on February 15, 2010: gud

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