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关于SendMessageCallback函数提示出现错误问题,错误号error C2664...

zliang2000 2004-04-06 12:32:37

::SendMessageCallback (this->m_hWnd,WM_COMMAND,MAKEWPARAM(ID_TARGETCOMMAND,0),0,MySendAsyncProc,(ULONG)pTm);

提示:
error C2664: 'SendMessageCallbackA' : cannot convert parameter 5 from 'void (struct HWND__ *,unsigned int,unsigned long,long)' to 'void (__stdcall *)(struct HWND__ *,unsigned int,unsigned long,long)'
None of the functions with this name in scope match the target type

这是怎么回事情,原先pTm的类型是ULONG_PTR，但在vc6中辨认不了这种数据类型，我换成ULONG就出现上述错误，请高手指点！

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