1.假如我們創建的Com組件的工程名叫TestCom,在其中添加了一個接口叫MyCom,接口名會自動命名為IMyCom,在其中添加兩個方法，分別為：

C++代碼 ?

HRESULT?Add([in]?long?n1,[in]?long?n2,[out,retval]long?*?pVal);??

HRESULT?Cat([in]?BSTR?s1,[in]?BSTR?s2,[out,retval]?BSTR?*?pVal);??

HRESULT Add([in] long n1,[in] long n2,[out,retval]long * pVal); HRESULT Cat([in] BSTR s1,[in] BSTR s2,[out,retval] BSTR * pVal);

?
編繹成功后，會生成TestCom.dll
注意此時我們生成的Com組件層次即為：TestCom.IMycom.方法;

2.下面總結出調用該Com的幾種方法：

Cpp代碼 ?

#include?"stdafx.h"??

#include?<atlbase.h>??

#import?"G:\\workspace\\VC_WorkSpace\\TestCom\\Debug\\TestCom.dll"?no_namespace??

#include "stdafx.h" #include <atlbase.h> #import "G:\\workspace\\VC_WorkSpace\\TestCom\\Debug\\TestCom.dll" no_namespace

?

/*
注意：在導入了com的dll后，會在工程的exe目錄下生成兩個文件：TestCom.tlh與TestCom.tli,一個為定義文件，一個為實現文件，打開TestCom.tlh定義文件，會發現有類似這樣幾句：

_COM_SMARTPTR_TYPEDEF(IMyCom, __uuidof(IMyCom)); //該宏定義了指向接口IMyCom的指針IMyComPtr,以后的程序中可以直接用IMyComPtr這個指針類型。

struct __declspec(uuid("92e83a37-399a-47b1-bf6c-0ab052650cfe"))
MyCom; //該句定義了CLSID為"{92e83a37-399a-47b1-bf6c-0ab052650cfe}",通過它我們可以通過CLSIDFromString獲取clsid;

struct __declspec(uuid("103b4c6e-3d3e-4e38-ab50-b9348465fc13"))
IMyCom : IDispatch //該句定義了接口ID:IID為"{103b4c6e-3d3e-4e38-ab50-b9348465fc13}",通過它我們可以通過IIDFromString獲取接口iid;

CoCreateInstance函數就用到了上面兩個做為參數來創建Com對象.
*/

第一種方法：

Cpp代碼 ?

int?impl0()??

{??

CoInitialize(NULL);??

CLSID?clsid;??

IID?iid;??

HRESULT?hr?=?CLSIDFromString(OLESTR("{92e83a37-399a-47b1-bf6c-0ab052650cfe}"),&clsid);??

if(NOERROR?!=?hr){??

MessageBox(NULL,"ErrCLSIDFromString","ErrCLSIDFromString",MB_OK);??

return?-1;??

}??

??

HRESULT?hriid?=?IIDFromString(OLESTR("{103b4c6e-3d3e-4e38-ab50-b9348465fc13}"),&iid);??

if(S_OK?!=?hriid){??

MessageBox(NULL,"ErrIIDFromString","ErrIIDFromString",MB_OK);??

return?-1;??

}??

??

{??

CComPtr<imycom>?pMyCom;??

pMyCom.CoCreateInstance(clsid);??

long?ret;??

ret?=?pMyCom->Add(1,2);??

}??

CoUninitialize();??

return?0;??

}??

int impl0() { CoInitialize(NULL); CLSID clsid; IID iid; HRESULT hr = CLSIDFromString(OLESTR("{92e83a37-399a-47b1-bf6c-0ab052650cfe}"),&clsid); if(NOERROR != hr){ MessageBox(NULL,"ErrCLSIDFromString","ErrCLSIDFromString",MB_OK); return -1; }HRESULT hriid = IIDFromString(OLESTR("{103b4c6e-3d3e-4e38-ab50-b9348465fc13}"),&iid); if(S_OK != hriid){ MessageBox(NULL,"ErrIIDFromString","ErrIIDFromString",MB_OK); return -1; }{ CComPtr<imycom> pMyCom; pMyCom.CoCreateInstance(clsid); long ret; ret = pMyCom->Add(1,2); } CoUninitialize(); return 0; }

?

?

第二種方法：

Cpp代碼 ?

int?impl1()??

{??

CoInitialize(NULL);??

CLSID?clsid;??

CLSIDFromProgID(OLESTR("TestCom.MyCom"),&clsid);?//"TestCom.MyCom"即為Dll名+Com對象名??

{??

CComPtr<imycom>?pMyCom;??

pMyCom.CoCreateInstance(clsid);??

long?ret;??

ret?=?pMyCom->Add(1,2);??

}??

CoUninitialize();??

return?0;??

}??

int impl1() { CoInitialize(NULL); CLSID clsid; CLSIDFromProgID(OLESTR("TestCom.MyCom"),&clsid); //"TestCom.MyCom"即為Dll名+Com對象名 { CComPtr<imycom> pMyCom; pMyCom.CoCreateInstance(clsid); long ret; ret = pMyCom->Add(1,2); } CoUninitialize(); return 0; }

?

?

第三種方法：

Cpp代碼 ?

int?impl2()??

{??

CoInitialize(NULL);??

IMyComPtr?Pt?;??

if?(!SUCCEEDED(Pt.CreateInstance(__uuidof(MyCom))))??

{??

DWORD?err;??

err?=?GetLastError();??

char?Msg[128]={0};??

sprintf(Msg,"%d",err);??

MessageBox(NULL,Msg,"Err",MB_OK);??

return?-1;??

}??

long?ret?=?Pt->Add(1,2);??

CoUninitialize();??

return?0;??

}??

int impl2() { CoInitialize(NULL); IMyComPtr Pt ; if (!SUCCEEDED(Pt.CreateInstance(__uuidof(MyCom)))) { DWORD err; err = GetLastError(); char Msg[128]={0}; sprintf(Msg,"%d",err); MessageBox(NULL,Msg,"Err",MB_OK); return -1; } long ret = Pt->Add(1,2); CoUninitialize(); return 0; }

?

?

第四種方法：

Cpp代碼 ?

int?impl3()??

{??

CoInitialize(NULL);??

IMyComPtr?Pt(__uuidof(MyCom))?;??

long?ret?=?Pt->Add(1,2);??

CoUninitialize();??

return?0;??

}??

int impl3() { CoInitialize(NULL); IMyComPtr Pt(__uuidof(MyCom)) ; long ret = Pt->Add(1,2); CoUninitialize(); return 0; }

?

?

第五種方法：

Cpp代碼 ?

int?impl4()??

{??

??CoInitialize(NULL);??

??IMyCom?*?pMyCom=NULL;??

??

??CLSID?clsid;??

??IID?iid;??

??HRESULT?hr?=?CLSIDFromString(OLESTR("{92e83a37-399a-47b1-bf6c-0ab052650cfe}"),&clsid);??

??if(NOERROR?!=?hr){??

??MessageBox????(NULL,"ErrCLSIDFromString","ErrCLSIDFromString",MB_OK);??

return?-1;??

}??

??

HRESULT?hriid?=?IIDFromString(OLESTR("{103b4c6e-3d3e-4e38-ab50-b9348465fc13}"),&iid);??

if(S_OK?!=?hriid){??

??MessageBox(NULL,"ErrIIDFromString","ErrIIDFromString",MB_OK);??

??return?-1;??

}??

??

if?(!SUCCEEDED(::CoCreateInstance(clsid,NULL,CLSCTX_INPROC_SERVER,iid,(void**)&pMyCom)))??

{??

??DWORD?err;??

??err?=?GetLastError();??

??char?Msg[128]={0};??

??sprintf(Msg,"%d",err);??

??MessageBox(NULL,Msg,"Err",MB_OK);??

??return?-1;??

}??

??

long?ret;??

ret?=?pMyCom->Add(1,2);??

??

CoUninitialize();??

return?0;??

}??

int impl4() {CoInitialize(NULL);IMyCom * pMyCom=NULL;CLSID clsid;IID iid;HRESULT hr = CLSIDFromString(OLESTR("{92e83a37-399a-47b1-bf6c-0ab052650cfe}"),&clsid);if(NOERROR != hr){MessageBox (NULL,"ErrCLSIDFromString","ErrCLSIDFromString",MB_OK); return -1; }HRESULT hriid = IIDFromString(OLESTR("{103b4c6e-3d3e-4e38-ab50-b9348465fc13}"),&iid); if(S_OK != hriid){MessageBox(NULL,"ErrIIDFromString","ErrIIDFromString",MB_OK);return -1; }if (!SUCCEEDED(::CoCreateInstance(clsid,NULL,CLSCTX_INPROC_SERVER,iid,(void**)&pMyCom))) {DWORD err;err = GetLastError();char Msg[128]={0};sprintf(Msg,"%d",err);MessageBox(NULL,Msg,"Err",MB_OK);return -1; }long ret; ret = pMyCom->Add(1,2);CoUninitialize(); return 0; }

?

?

?

int main(int argc, char* argv[])
{
return impl0();
}

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