用CoMarshalInterThreadInterfaceInStream调度接口指针时,为何总是不成功,请各位高手指点迷金

yangfanfan 2002-02-15 02:49:58

用CoMarshalInterThreadInterfaceInStream调度接口指针时,为何总是不成功,请各位高手指点迷金.

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fantong 2002-02-21

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建议如果很少调用的函数可以使用这个方法，频繁调用的不要用，偶感觉有点慢

fantong 2002-02-21

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to:yangfanfan
嗬嗬，&号纯属笔误
IStream 上次确实是我自己创建的，
偶，再看了看自己创建IStream是脱裤子放屁，这是[out]参数嘛
代码不要赵抄阿，我只是说了这个流程，这些代码多半编译都通不过，
但是这个方法确实是可以的，我用它在一个窗口线程中创建的com中向另外一个工作线程传递一个接口参数，唉，说不清楚，画画图
(windowA (MycomB(functionC(),thread D())))
我在functionC中创建了MycomE,再将MycomE打包传递到thread D 中使用
这个办法是可以的
后来我舍弃了这段代码改用别的方法，所以代码没了

fantong 2002-02-20

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first look up CoMarshalInterThreadInterfaceInStream in msdn,it use CoGetInterfaceAndReleaseStream to unmarshal Interface in the stream.
then you now how to do.
1. create a IStream ,do not write something in it
eg.
::CoInitialize(NULL);
HRESULT hr;
CComPtr<IStream> pStream;
hr=pStream.CoCreateInstance(CLSID_Stream);
2.then marshal your own interface to the stream

hr=CoMarshalInterThreadInterfaceInStream(IID_YOUWANT_MARSHAL_INTERFACE,pYourObj,pStream);
if hr=0,then you can pass the pStream to the other thread
3.unmarshal you obj from the stream
eg.
UINT Myfunc(void p)
{
//if the p is the stream pointer
CComPtr<IID_YOUWANT_MARSHAL_INTERFACE> pYourObj;
hr=CoGetInterfaceAndReleaseStream((IStream*)p
,IID_YOUWANT_MARSHAL_INTERFACE,(void**)pYourObj);
//the you have the pointer to you obj in the other thread,do not care about the release of IStream p
}
I just use the two function pass interface pointer cross thread and not test cross process ,that's long long ago and the source code is lost.this code maybe contain error because i write it here not copy it to here.the stream implement you can find in many component.eg the ado .to use it just use
#import "C:\Program Files\Common Files\System\ado\msado15.dll" named_guids,rename("EOF","adoEOF")
using namespace ADODB;

yangfanfan 2002-02-20

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fantong(饭桶)兄：
你的代码我试过了,还是不行,
另外
hr=CoMarshalInterThreadInterfaceInStream(IID_YOUWANT_MARSHAL_INTERFACE,pYourObj,pStream);
应该为
hr=CoMarshalInterThreadInterfaceInStream(IID_YOUWANT_MARSHAL_INTERFACE,pYourObj,&pStream);
我想问你一个问题,msdn里面说CoMarshalInterThreadInterfaceInStream
这个函数已经包括创建Stream实例的工作,但是在你的代码中还是自己创建了实例,
拜托请回忆一下你的源代码,帮帮忙啦

rover1 2002-02-20