HRESULT返回类型? [英] HRESULT Return Type?

问题描述

STDMETHODIMP CDumpMessage :: DumpMessage(BSTR消息)
{
CString msg(Message);
OutputDebugString(msg);

}

这段代码给了错误..请帮助我..

STDMETHODIMP CDumpMessage::DumpMessage( BSTR Message )
{
CString msg(Message);
OutputDebugString(msg);

}

this piece of code is giving error..pls help me..

推荐答案

您不能在COM上传递CString作为参数，而是将其更改为BSTR ，使用CComBSTR在调用端包装CString，并使用CString在被调用端包装BSTR

变成

[ id( 1 ), helpstring( "Chat" )] HRESULT DumpMessage([in]BSTR Message );

来电者

you can''t pass a CString as a parameter across COM, change it to a BSTR, using CComBSTR to wrap the CString at the calling end, and CString to wrap the BSTR on the callee end

so it becomes

[ id( 1 ), helpstring( "Chat" )] HRESULT DumpMessage([in]BSTR Message );

caller

CString msg(_T("hello world"));
object->DumpMessage(CComBSTR(msg));

被呼叫者

callee

STDMETHOD(DumpMessage)(BSTR Message)
{
 CString msg(Message);
 OutputDebugString(msg);
}

此处: Wiki:HRESULT [

Here: Wiki: HRESULT[^]

It is a datatype and have a defined format. Not a normal string. CString is totally another datatype.

HRSULT-> [ ^ ]

HRESULT是一个32位无符号整数，指示消息的成功和失败.例如S_OK，E_NOINTERFACE.我们还可以创建自定义错误，也可以传递描述.

HRSULT ->[^]

The HRESULT is a 32-bit unsigned integer which indicate the success and failure of message. For example S_OK, E_NOINTERFACE. We can create our custom error also and pass the description also.

这篇关于HRESULT返回类型?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！