I am calling unmanaged C programming code from C# .Net managed code. But I am unable to pass string array as a parameter to function from .Net Function in C:
dllmain(const int argc, const char *argv[]){}
Please help me, how I can call this function from C Sharp.Net
Thanks.
Here is a way you can do that:
C# code:
Declare C function you want call from C#
[DllImport("<DLL_File_Name>.dll", CharSet = CharSet.Auto, EntryPoint = "dllmain", ExactSpelling = false, CallingConvention = CallingConvention.StdCall)]
public static extern void dllmain(ref string str1);
Define the string
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 100)]
public string str1;
Call the C function from C# code
dllmain(ref str1);
C Code:
Function prototype
__declspec(dllexport) void __stdcall dllmain(char *str1);
Function definition
void__stdcall dllmain(char *str1)
{
:
}
Hope this will be helpful for you. :-)
Add the following attributes to the parameter argv when declaring the function in .net:
[In][MarshalAsAttribute(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPStr)]
You should also add the CharSet=CharSet.Unicode property to the DllImport attribute applied to the external function.
