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.NET Forum / .NET Framework / Compact Framework / January 2006Pass C# string to eVC DLL
I have an eVC DLL that I call from C#. I want to pass a C# string to the dll and then copy that string's data into a char buffer as shown below. It fails. Could anyone help me fix this code to what it should be. Thank you! eVC DLL: int mydll(LPSTR s) { char data[40]; strcpy(data, s); } C# calling the DLL: [DllImport("MyCProcess.dll")] public static extern int mydll(string s); int r = mydll("teststring"); Fails how? C# strings, it should be clear, are always Unicode, not ASCII. If you're counting on the string to consist of 8-bit characters, you're wrong and it's probably showing you just the first character. Paul T. >I have an eVC DLL that I call from C#. I want to pass a C# string to the >dll and then copy that string's data into a char buffer as shown below. It [quoted text clipped - 11 lines] > public static extern int mydll(string s); > int r = mydll("teststring"); CE is unicode, so you shouldn't be using char, but instead either wchar_t or the TCHAR macro, along with the right copy function. -Chris >I have an eVC DLL that I call from C#. I want to pass a C# string to the >dll and then copy that string's data into a char buffer as shown below. It [quoted text clipped - 11 lines] > public static extern int mydll(string s); > int r = mydll("teststring"); Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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