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CBuilder4 patch broke MIDAS
By: Kevin Scardina
Abstract: After installing the patch to CBuilder4 even the simplest MIDAS applications will not work.
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Problem: |
When trying to set the Active property of a TClientDataSet to true in design mode the IDE reports a:
'src->QueryInterface (GetIID(), (LPVOID*)(&intf))': No such interface supported @ D:/CBUILD~1/INCLUDE/VCL/utilcls.h /2014
error message.
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Workaround: |
This is a known bug that occurred when we released the patch to CBuilder4. The workaround to this is to
edit the <SERVER> Impl.cpp file. You need to change everyplace in this file where the class tries to set an
in/out parameter value with a IProviderPtr without typecasting the to a IProvider*
For example if you created a remote data module that exported a TTable called Table1 some of the server
code generated would look as follows:
...
STDMETHODIMP TTestServerImpl::get_Table1(IProviderPtr* Value)
{
try
{
_di_IProvider IProv = m_DataModule->Table1->Provider;
IProv->AddRef();
*Value = IProv; //<- HERE IS ONE OF THE PROBLEMS!!!
}
catch(Exception &e)
{
return Error(e.Message.c_str(), IID_ITestServer);
}
return S_OK;
};
...
What you need to do is change the line:
*Value = IProv;
To:
*Value = (IProvider*)IProv;
If you do this anywhere in this file that a return value (this includes out parameters) is an IProviderPtr the server should work fine.
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