I have to following C++ header that corresponds to a DLL that I'm trying to use in C#.
class __declspec(dllimport) Value {
std::string bytes;
public:
Value();
void setValue(BYTE* val, int length);
int size();
BYTE* getBytes();
};
How do I import that class into C# In particular, I'm having trouble figuring out the constructor. The compiler says that I can only use DllImport with static methods...
Also, how do I translate the Byte pointers into C#
So far, I've gotten:
public class Value { string bytes;[
DllImport("PCMPlusAPI.dll", EntryPoint = " 0Value@@QAE@XZ")] static extern IntPtr Value_Constructor();[
DllImport("PCMPlusAPI.dll", EntryPoint = " setValue@Value@@QAEXPAEH@Z")] extern void setValue (Byte* val, int length);[
DllImport("PCMPlusAPI.dll", EntryPoint = " size@Value@@QAEHXZ")] extern int size();[
DllImport("PCMPlusAPI.dll", EntryPoint = " getBytes@Value@@QAEPAEXZ")] extern char* getBytes();}
But that doesn't work both because of the non-static methods, and the Byte pointers.
Help is much appreciated. =)
Translating a C++ header for a DLL into C#
Rajesh Prabhu. R
You can't use P/Invoke to call C++ classes directly. C++ class is basically different than C# (.NET) class - in .NET there is automatic memory cleanup and other features, which completely change basement. C++ DLL will contain prepared machine codes, while .NET assembly contains IL code, that translated to machine code later during execution.
I think best way is to port C++ source to C# (if possible) or write C++ DLL that use Pascal (WinAPI) calling style (and no classes) and then use P/Invoke.