Using C++ dll having header file in C#

Question

0.00/5 (No votes)

See more:

I am totally new in C++ and I want to use C++ dll (having header file) in C# program.

Please find below header file.

C#

#pragma once
#define DAILY_PERIOD 24*60
#define MIN_PERIOD 1

#ifdef API_DLL 
#define METHOD_TYPE __declspec(dllexport)
#else
#define METHOD_TYPE __declspec(dllimport)
#endif

struct Quote {
unsigned long Date;
float Price;
float Open;
float High;
float Low;
float Volume;
float OpenInterest; 
};

class METHOD_TYPE CMinuteApiCallback
{
public: 

virtual int quote_notify( const char* symbol, int interval, int nMaxSize, Quotation *pQuotes, unsigned long echo)=0;

};


class METHOD_TYPE CMinuteApi
{
public:
CMinuteApi(void);

int Initialise(char *serialkey, CMinuteApiCallback* callback);

int GetQuote(char * symbol, int periodicity, unsigned long lasttimeupdate, unsigned long echo);

int DeleteQuote(char * symbol, int periodicity);

~CMinuteApi(void);
};

So please let me know how can I call all these methods in my C# program.

Thanks in advance.

[Edit]Code block added[/Edit]

Posted 14-Jan-13 6:48am

User 3602883

Updated 14-Jan-13 6:49am

Thomas Daniels

v2

Add a Solution

3 solutions

Solution 4

If you are new to C++, then it might not the best idea to make a program that use both languages.

Also your C++ code does not use the same charset as the C# one so it might be problematic for internationalization.

Also your declaration have many problems in the context of being used from C# starting with constructor and destructor and also with inconsistent usage of const modifier. In particular, you would have to modify the interface so that the allocation of memory would be done by the C++ DLL. Same for calling destructor and freeing memory at the end.

I think it would be best to implement everything in C# for simplicity purpose.

If you really need some C++ code (for example to reuse existing code that would require more than a few hours to port), the using mixed mode C++ (C++/CLI in default mode: /clr) for an intermediate DLL might be the easiest route... but you still have some advanced stuff to learn like using gc_root.

Posted 14-Jan-13 13:16pm

Philippe Mori

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Tamer Hatoum · Accepted Answer · 2013-01-14T07:39:00

Solution 2

You can use the the Dllimport to use functions in your C++ dll files,

please follow that link DLLIMPORT

Regards...

Posted 14-Jan-13 7:39am

Tamer Hatoum

Thomas Daniels · Accepted Answer · 2013-01-14T07:40:00

Solution 3

Hi,

Use Platform Invoke (P/Invoke):
Essential P/Invoke[^]
P/Invoke Tutorial: Basics (Part 1)[^]
http://msdn.microsoft.com/en-us/magazine/cc164123.aspx[^]

Posted 14-Jan-13 7:40am

Thomas Daniels