dllimport

I'm working in c# and I need to use this function from a c++ dll: extern "C" char IMPEXP __stdcall service_GetParameter ( const char* parameter, const int value_lenght, char** value ); I have used it in c++ code as follow: char *val = new char[256]; service_GetParameter("firmware_version", 255, &val); AnsiString FirmwareVersion = val; delete[] val; How can I import this function and use it in c#? Thanks in advance If this function allocates memory and makes the caller responsible for freeing it, I'm afraid you'll have to manage this manually: Declare the parameter as a ref IntPtr and use the

I am from electric engineer background, therefore my knownledge is small about C#,DLL,etc.... I want to use c function into a C#. I know there is a couple post about that but I didn't find one that is enough simple. Currently, I got C function call windows API to read/write on the USB port. First to create a .dll do I need a header file? Because I got the following function decleration function into a header. The examples that I saw on stack overflow and Internet only use a simple .c file, Can I get rid of the header files? __declspec(dllexport) LMUSB_HANDLE __stdcall InitializeDevice(unsigned

I have a Visual Studio Solution for a Windows Forms application with some Class Libraries that are my Application Modules. My application run under "Any CPU" and can't be changed to "x86" because it uses lots of 64 bit dll references. I have a Native C++ 32 bit dll that I need to use inside of one of the app modules but it's quite impossible and dont want to use Wrappers, so I have read that the easiest is to use a Self-Hosted WCF Service. The approach that I was thinking is to create a Console Application (32 bit) project, that will be referencing the Native C++ 32 bit dll, within my solution

In my program (C#), i used method Marshal.PtrToStructure to convert object add a memory address to structure in a loop. At the first element, this work normal. But at the second element, the access violation exception occurs. The access violation exception only occurs on win 7 (64 bits), it does not occur on win xp (32 bits). I don't know cause and solution for it. Please help me. Note: I use .NET Framework 3.5. Code as bellow: [StructLayout(LayoutKind.Sequential)] public struct gpc_vertex { public float x; public float y; }; private ArrayList DoPolygonOperation() { IntPtr currentVertex =