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How can i use a c++ compiled dll on c#?

Posted on 2008-10-13
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Last Modified: 2013-11-20
Hello,

Ive compiled a dll and i need it to use on c#, how can i do that?

Im ataching dll code.

THanks
#include "stdafx.h" // Required Precompiled Header

#include "unknwn.h" // IUnknown Interface

#include "Exdisp.h" // IWebBrowser2 Interface

#include "stdlib.h" // x

#include "mshtml.h" // MSHTML
 

BOOL APIENTRY getFrameDocumentById( HANDLE hModule,

DWORD ul_reason_for_call,

LPVOID lpReserved)

{

return TRUE;

}
 

extern "C" __declspec(dllexport) HRESULT CALLBACK GetFrameDocuments(long cbAddress,

IWebBrowser2* pTopWebBrowser) {
 

//

// ----- Initialize Variables ---

//

int code = 0;

HRESULT hr = 0;

UINT i = 0;
 

// Validate WebBrowser Argument (!NULL, top win, !busy, etc.)

if (pTopWebBrowser != NULL) {
 

// Get pTopWebBrowser's Document IDispatch Interface

code = 1;

IDispatch* pTopDocument;

hr = pTopWebBrowser->get_Document(&pTopDocument);
 

if (pTopDocument != NULL) {
 

// Get pTopDocument's Container OLE Interface

code = 2;

IOleContainer* pContainer;

hr = pTopDocument->QueryInterface(IID_IOleContainer, (void**)&pContainer);

pTopDocument->Release();
 

if (SUCCEEDED(hr)) {
 

// Get Container's Embeddings Enumerator

code = 3;

IEnumUnknown* pEnumerator;

hr = pContainer->EnumObjects(OLECONTF_EMBEDDINGS, &pEnumerator);

pContainer->Release();
 

if (SUCCEEDED(hr)) {
 

// Iterate Container's Embeddings

IUnknown* pUnk;

ULONG uFetched;
 

for (i = 0; S_OK == pEnumerator->Next(1, &pUnk, &uFetched); i++) {
 
 

// Get Embedded's IWebBrowser2 Interface

code = 4;

IWebBrowser2* pFrameWebBrowser;

hr = pUnk->QueryInterface(IID_IWebBrowser2, (void**)&pFrameWebBrowser);
 

if (SUCCEEDED(hr)) {
 

// Get Embedded's IHTMLElement Interface

code = 5;

IHTMLElement* pFrameIHTMLElement;

hr = pUnk->QueryInterface(IID_IHTMLElement, (void**)&pFrameIHTMLElement);

pFrameIHTMLElement->Release();
 

if (SUCCEEDED(hr)) {
 

// Get IHTMLElement's Document IDispatch Interface

code = 6;

IDispatch* pFrameDocument;

pFrameWebBrowser->get_Document(&pFrameDocument);

pFrameWebBrowser->Release();
 

if (pFrameDocument != NULL ) {
 

// Get Frame's Docuument IDispatch Interface

code = 7;

IHTMLDocument2* pFrameIHTMLDocument2;

hr = pFrameDocument->QueryInterface(IID_IHTMLDocument2, (void**)&pFrameIHTMLDocument2);

pFrameDocument->Release();
 

if (SUCCEEDED(hr)) {
 

typedef void (__stdcall *FUNCPTR)(

IWebBrowser2 *pWebBrowser,

IHTMLDocument2 *pFrameDocument,

BSTR pbstr);
 

FUNCPTR vbFunc = (FUNCPTR)cbAddress;
 

wchar_t wchar[] = L"Test string";

vbFunc(pTopWebBrowser, pFrameIHTMLDocument2, SysAllocString(wchar));
 

pFrameIHTMLDocument2->Release();
 

} // pFrameIHTMLDocument2

} // pFrameDocument

} // pFrameIHTMLElement

} // pFrameWebBrowser

pUnk->Release();

} // for pEnumerator

} // pEnumerator

pEnumerator->Release();

} // pContainer

} // pTopDocument

} // Vaidate pTopWebBrowser
 
 

//return 0;

if (hr == 0) {

return i + 9900; // testing

}

else {

return code + 8800;

}
 

} // GetFrameWindows
 
 
 
 

Def File:

; Cross.def : Declares the module parameters for the DLL.
 

LIBRARY      "Cross"
 

EXPORTS

    ; Explicit exports can go here

	GetFrameDocuments @1

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Comment
Question by:epagos7
4 Comments
 
LVL 9

Accepted Solution

by:
Misbah earned 500 total points
ID: 22705509
you need to declear the functions/methods you made in cpp in a c# class
and then you can use this c# class (wrapper for cpp) as any normal c# class.

see this example:

http://msdn.microsoft.com/en-us/magazine/cc301501.aspx
0
 

Author Comment

by:epagos7
ID: 22705637
mmm,

any help how can i declare and use the c++ func:

extern "C" __declspec(dllexport) HRESULT CALLBACK GetFrameDocuments(long cbAddress,
IWebBrowser2* pTopWebBrowser) {

?

Also i do not have HResult type on c#
0
 
LVL 19

Expert Comment

by:LordOfPorts
ID: 22706598
System.Long should correspond to HRESULT, I am however not quite certain regarding the IWebBrowser2 interface however this thread might be helpful http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2463777&SiteID=1
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