Microsoft KB Archive/252162

= How to Use the ADO Stream Object in Visual C++ =

PSS ID Number: 252162

Article Last Modified on 8/24/2001

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The information in this article applies to:

 ActiveX Data Objects (ADO) 2.5, when used with:  Microsoft Visual C++, 32-bit Enterprise Edition 6.0

 Microsoft Visual C++, 32-bit Professional Edition 6.0

 Microsoft Visual C++, 32-bit Learning Edition 6.0  ActiveX Data Objects (ADO) 2.6, when used with:  Microsoft Visual C++, 32-bit Enterprise Edition 6.0</li></ul>

 Microsoft Visual C++, 32-bit Professional Edition 6.0</li></ul>

 Microsoft Visual C++, 32-bit Learning Edition 6.0</li></ul> </li> ActiveX Data Objects (ADO) 2.7, when used with:  Microsoft Visual C++, 32-bit Enterprise Edition 6.0</li></ul>

 Microsoft Visual C++, 32-bit Professional Edition 6.0</li></ul>

 Microsoft Visual C++, 32-bit Learning Edition 6.0</li></ul> </li></ul>

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This article was previously published under Q252162

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SUMMARY
ADO 2.5 introduces a new object called Stream. This object allows for streams of data to be opened based on binary data or text. The streams can be created from URLs or ADO 2.5 record objects. Adovcstream.exe is a self-extracting file that contains the source and project files for a Visual C++ 6.0 project. Create a new directory for the project, extract the files, then open the project in Visual C++ and build it to create an .exe file.

This sample illustrates a console application that uses the stream interface to retrieve an HTML file on the Internet.

Here is the key portion of the sample code that demonstrates the use of the ADO 2.5 Stream object:

_StreamPtr  spStream;

hr = spStream.CreateInstance(__uuidof(Stream)); // Gonna read the MSFT stock split info page _variant_t varUrl = "URL=http://microsoft.com/msft/stock/splits.htm"; // Tell the stream what type of data it is reading // Charset values can be found in registry, // HKEY_CLASSES_ROOT\MIME\Database\Charset //Set it to Western spStream->Charset = "iso-8859-1";

//Open stream as read only,default options,no username, no password hr = spStream->Open(varUrl,adModeRead,adOpenStreamUnspecified,"","");

printf("Reading http://microsoft.com/msft/stock/splits.htm ...\n\n");

//Read the whole page into a bstr _bstr_t bstrSplitPage = spStream->ReadText(adReadAll); //Close the stream ASAP since we don't need it anymore spStream->Close;

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MORE INFORMATION
The following file is available for download from the Microsoft Download Center:

ADOVCStream.exe

Release Date: September 1, 2000

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on secure servers that prevent any unauthorized changes to the file.

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