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Parsing XML as String

Started by fathom88 Jan 23, 2007 at 1:16 PM 2 replies 550+ views

Original Post

Jan 23, 2007 at 1:16 PM

A client is sending me XML messages. I read the messages into a string buffer. I would like to parse the string directly. However, I'm running into problems. char Buffer[256]; ... ... Buffer is loaded w/ xml message ... VARIANT_BOOL result; _bstr_t *Temp = NULL; HRESULT hr; BSTR MyBSTR; Temp = new _bstr_t(Buffer); if(Temp != NULL) { MyBSTR = Temp->Detach(); hr = pXmlDoc->loadXML( MyBSTR,&result); } I get an access violation error when I run. I must be doing something wrong at the BSTRs. Could someone point me in the right direction. I've parsed files before, but I don't want to save my buffer to a file and reload as a document. Thanks.

TheTroll

Jan 23, 2007 at 1:31 PM

Not sure exactly what you are doing, but I would suggest you look into the .net intity XmlTextReader class. Would save you a lot of headaches.

theTroll

IndyJones

Jan 23, 2007 at 3:34 PM

Where do you get the access violation error (if you run in debug mode the debugger should break at the location causing the error).
Do you have to provide a BSTR to the loadXML method? What XML processing API do you use?
Also - you are leaking memory (you never free _bstr_t and if you Detach the BSTR from Temp you will also have to free that string using SysFreeString).

fathom88

Jan 24, 2007 at 6:22 AM

I use this to define my Xml Doc.

MSXML2::IXMLDOMDocument *pXmlDoc;

Yes, I need to send it a BSTR. It would be a lot easier, if I could load it as char string. I also noticed something strange. The BSTR does not contain my entire char string buffer. This seems like a real pain. I've used this technique before on XML files. Thanks anyways. I think I might be better off just parsing the messages w/ the CString.

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