OPC Client浏览OPC Server的简单实例程序源代码

OPC Client浏览OPC Server的简单实例

简单程序源代码：

//main.cpp

//************************************************************************************************

//浏览本地OPC服务器

//************************************************************************************************

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

#include

#include

#include

#import \"C:\\WINNT\\system32\\OpcEnum.exe\" no_namespace//OpcEnum.exe更改

根据

#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)] CATID_OPCDAServer30

interface

//--------------------------------------------------------------------------------------------------------------

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, clsctx,IIDOPCServerList ,(void**)&gpOPC);

// 查询OPC DA 2.0 组件目录接口指针

CLSID catid;

NULL,

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, (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);

&catid,

//打印OPC数据服务器的有关信息

printf(\"ProgID = %ls, UserType = %ls\\n\

CoTaskMemFree(pszProgID);

CoTaskMemFree(pszUserType);

}

//释放接口

if(gpOPC)

gpOPC->Release();

}