📄 vc调用c#写的com+组件 - 小雄的家 - csdnblog.htm
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<DIV class=postTitle><A
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border=0> VC调用C#写的COM+组件</A> </DIV>
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<P> 首先对COM+组件的写法需要注意以下几点:</P>
<P>1.接口,事件,方法,属性必须是public,</P>
<P>2.方法和属性必须在接口中声明,事件也必须在事件接口中声明.</P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<P>否则将在VC中无法调用,在接口中声明主要是为了在COM 中的vtab中.</P></BLOCKQUOTE>
<P dir=ltr>3.必须对接口中的方法,属性,事件前声明[DispId(1)]</P>
<P dir=ltr>4.每个接口都必须有一个GUID</P>
<P dir=ltr>5.而且项目一定需要是COM Interop,并且具有强命名</P>
<P dir=ltr>示例:</P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<P dir=ltr>//接口声明</P>
<P
dir=ltr>[Guid("694C1820-04B6-4988-928F-FD858B95C880")]<BR>
public interface DBCOM_Interface<BR>
{<BR>
[DispId(1)]<BR> void Init(string
userid , string password);<BR>
[DispId(2)]<BR> bool
ExecuteSelectCommand(string
selCommand);<BR>
[DispId(3)]<BR> bool
NextRow();<BR>
[DispId(4)]<BR> void
ExecuteNonSelectCommand(string
insCommand);<BR>
[DispId(5)]<BR> string
GetColumnData(int pos);<BR> }</P>
<P dir=ltr> // // 事件接口声明<BR>
[Guid("47C976E0-C208-4740-AC42-41212D3C34F0"), <BR>
InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]<BR>
public interface DBCOM_Events <BR> {<BR>
}</P>
<P dir=ltr>//对于实现类的声明</P>
<P dir=ltr>
[Guid("9E5E5FB2-219D-4ee7-AB27-E4DBED8E123E")]<BR>
ClassInterface(ClassInterfaceType.None), </P>
<P dir=ltr> //不产生类接口,如果需要产生声明为<FONT
face="Courier New">ClassInterfaceAttribute</FONT><BR>
ComSourceInterfaces(typeof(DBCOM_Events))] </P>
<P dir=ltr> //声明产生一个COMSource的事件列表<BR> public class
DBCOM_Class : DBCOM_Interface<BR> {</P>
<P dir=ltr> }</P></BLOCKQUOTE>
<P dir=ltr>在VC中的调用方法如下:</P>
<P dir=ltr>在VC++中进行组件调用的步骤(以DBCOM.tlb为例)：</P>
<P dir=ltr>1、在头文件中导入类型库tlb </P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<P dir=ltr>#import “DBCOM.tlb” </P></BLOCKQUOTE>
<P dir=ltr>2、初始化COM以及产生智能指针(一般是在需要调用COM组件中提供的方法时就需要产生指向该接口的智能指针) </P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<P dir=ltr>CoInitialize(NULL);//初始化COM </P>
<P dir=ltr>DBCOM::DBCOM_Interface p((__uuidof(DBCOM::DBCOM_Class )));
//名字空间：：接口Ptr p((__uuidof(名字空间：：类))) </P>
<P dir=ltr>DBCOM::DBCOM_Interface * Test=p; //名字空间：：接口
指向接口的智能指针</P></BLOCKQUOTE>
<P dir=ltr>3、调用COM中的方法</P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<P dir=ltr> _bstr_t m_string=”select * from user”; //传入参数 </P>
<P dir=ltr>bool bRet=Test->
ExecuteSelectCommand(m_string);//调用ExecuteSelectCommand方法</P></BLOCKQUOTE>
<P dir=ltr>4、释放环境</P>
<P dir=ltr> </P><BR><BR>
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panyaxiong发表于 2007年04月25日 23:30:00 </DIV></DIV><LINK
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