dllimport

I am using DllImport to call method in c wrapper library from my own .net class. This method in c dll creates a string variable and returns the pointer of the string. Something like this; _declspec(dllexport) int ReturnString() { char* retval = (char *) malloc(125); strcat(retval, "SOMETEXT"); strcat(retval, "SOMETEXT MORE"); return (int)retval; } Then i read the string using Marshall.PtrToStringAnsi(ptr). After i get a copy of the string, i simply call another c method HeapDestroy which is in c wrapper library that calls free(ptr). Here is the question; Recently while it is working like a

I'm new on windows phone developement and i have one problem that i don't know how to resolve.... the problem is.... i have a c++ project that i had complided with visual c++ 2010 and this create one dll with code compiled... so i know that C# import dll libraries but when i add refrences it's make this error "Unable to retrieve assembly fullname ""Parameter name: AssemblyPath" and i dont kown what it means... I searched on google and i found one method to import c++ dll manualy with DllImport and calling a external method... that causes one error because it's dont find the dll location... it

I'm attempting to write a C# managed class to wrap SHGetKnownFolderPath, so far it works on Vista, but crashes on XP due to not finding the proper function in shell32.dll, as expected. I want to have it set so I can fallback on a (admittedly hacky) solution using System.Environment.GetFolderPath if using XP. (Or, even better, if it can't find the funciton in shell32.) Is there any way to do this other then conditional compilation? My current code looks like: public abstract class KnownFolders { [DllImport("shell32.dll")] private static extern int SHGetKnownFolderPath([MarshalAs(UnmanagedType

I got a C++ dll which has to be integrated in a C# project. I think I found the correct way to do it, but calling the dll gives me this error: System.BadImageFormatException: An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B) This is the function in the dll: extern long FAR PASCAL convert (LPSTR filename); And this is the code I'm using in C# namespace Test{ public partial class Form1 : Form { [DllImport("convert.dll", SetLastError = true)] static extern Int32 convert([MarshalAs(UnmanagedType.LPStr)] string filename); private void button1_Click

Assuming I have these two files: Header.h class DLL ExportClass{ public: ExportClass(); static int test; }; Source.cpp #ifdef EXPORT #define DLL __declspec(dllexport) #else #define DLL __declspec(dllimport) #endif #include "Header.h" int ExportClass::test = 0; ExportClass::ExportClass(){ } And I won't define EXPORT (to import a already exported class with a static member), why do I get these warnings: 1>source.cpp(11): warning C4273: 'test' : inconsistent dll linkage 1> header.h(4) : see previous definition of 'public: static int ExportClass::test' 1>source.cpp(13): warning C4273: 'ExportClass