main.cpp

OPC 规范

//main.cpp
//************************************************************************************************
//浏览本地OPC服务器
//************************************************************************************************

#define _WIN32_DCOM  // Needed in order to call CoInitializeEx()

#include <iostream>
#include <objbase.h>
#include <comdef.h>

#import "C:\WINNT\system32\OpcEnum.exe" no_namespace	//根据OpcEnum.exe更改
#include "opcda.h"
#include "opcenum_i.c"

//--------------------------------------------------------------------------------------------------------------
//版本号----可以从规范中查到
static const CLSID CATID_OPCDAServer10 = 
{ 0x63d5f430, 0xcfe4, 0x11d1, { 0xb2, 0xc8, 0x0, 0x60, 0x8, 0x3b, 0xa1, 0xfb } };
// {63D5F430-CFE4-11d1-B2C8-0060083BA1FB}

static const CLSID CATID_OPCDAServer20 = 
{ 0x63d5f432, 0xcfe4, 0x11d1, { 0xb2, 0xc8, 0x0, 0x60, 0x8, 0x3b, 0xa1, 0xfb } };
// {63D5F432-CFE4-11d1-B2C8-0060083BA1FB}

//[uuid(CC603642-66D7-48f1-B69A-B625E73652D7)] interface CATID_OPCDAServer30
//--------------------------------------------------------------------------------------------------------------

void OPCServerList();

int main(int argc, char* argv[])
{
  HRESULT hr;
  int n_return = 0;

  try
  {
    // Initialize COM
    if(  
      FAILED( hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED) )
    )
      _com_issue_error(hr);
  }
  catch(_com_error e)
  {
    std::cout << "ERROR(" << e.Error() << "):  ";
    if( e.Description().length() > 0)
      std::cout << (TCHAR*)e.Description() << std::endl;
    else
	  std::cout << e.ErrorMessage() << std::endl;
    n_return = 1;
  }

  OPCServerList();

  // Uninitialize COM
  CoUninitialize();

  return 0;
}

//使用CoCreateInstance
void OPCServerList()
{
	CLSID clsid;
	clsid = CLSID_OpcServerList;	//在opcenum_i.c中定义
	IOPCServerList *gpOPC = NULL;

	DWORD clsctx;
	clsctx = CLSCTX_LOCAL_SERVER;	//本地服务
	IID IIDOPCServerList=IID_IOPCServerList;	//在opcenum_i.c中定义
	// 创建OPC服务器的浏览器对象-----
	HRESULT hr = CoCreateInstance(clsid, NULL, clsctx,IIDOPCServerList ,(void**)&gpOPC);	
	
	// 查询OPC DA 2.0 组件目录接口指针
	CLSID catid;	
	catid=CATID_OPCDAServer20;	//= CATID_OPCDAServer20;	//OPC数据访问服务器2.0组件目录
	IOPCEnumGUID *pEnumGUID;

	hr = gpOPC->EnumClassesOfCategories( 1, &catid, 1, &catid, (IEnumGUID**)&pEnumGUID); 
	if(S_OK!=hr)
		return;

	//获得支持OPC DA2.0数据服务器的CLSID
	unsigned long c;
	while (S_OK == pEnumGUID->Next(1, &clsid, &c)) 
	{
		LPOLESTR pszProgID;
		LPOLESTR pszUserType;
		hr = gpOPC->GetClassDetails(&clsid, &pszProgID, &pszUserType);
		//打印OPC数据服务器的有关信息
		printf("ProgID = %ls, UserType = %ls\n", pszProgID, pszUserType);
		CoTaskMemFree(pszProgID);
		CoTaskMemFree(pszUserType);
	}
	
	//释放接口
	if(gpOPC)
		gpOPC->Release();
}