Call C++ dll from c#

I need a running example of how to call a C++ dll funtion from a C# application. Here is a part of the H file #ifndef __TICKERAPI_H #define __TICKERAPI_H #ifndef __WINDOWS_ #include <windows.h> #endif #ifndef __TAPIDEF_H #include "tapidef.h" #endif // // function pointers to dynamically link the API // // // TickerApi function pointer declarations // typedef int (WINAPI* pTApiInitialize)(int); typedef void (WINAPI* pTApiShutDown)(void); // // ClientApi function pointer declarations // typedef int (WINAPI* pCApiInitialize)(int); typedef void (WINAPI* pCApiShutDown)(void); typedef void (WINAPI* pCApiSymbolRequest)(TfCApiSymbolRequest *pRequest); typedef void (WINAPI* pCApiDbaseRequest)(TfCApiDbaseRequest *pRequest); // // ServerApi function pointer declarations // typedef int (WINAPI* pSApiInitialize)(char *, char *, char *, int, int); typedef void (WINAPI* pSApiShutDown)(void); typedef char * (WINAPI* pSApiGetLastError)(void); __declspec(dllexport) int WINAPI TApiInitialize (int nMaxBufSize); __declspec(dllexport) void WINAPI TApiShutDown (void); ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform XP