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COM Port Sample 

Download sample

This sample demonstrates how to control a communications port.

Security noteSecurity Note

This sample code is provided to illustrate a concept and should not be used in applications or Web sites, as it may not illustrate the safest coding practices. Microsoft assumes no liability for incidental or consequential damages should the sample code be used for purposes other than as intended.

To open the sample file in Solution Explorer

  1. Click Download Sample.

    The File Download message box appears.

  2. Click Open, and on the left column of the zip folder window, click Extract all files.

    The Extraction Wizard opens.

  3. Click Next. You can change the directory that the files will be extracted to, and then click Next again.

  4. Make sure that the Show extracted files check box is selected, and click Finish.

  5. Double-click the sample's .sln file.

    The sample solution is displayed in Solution Explorer. You might get a security warning that says the solution location is not trusted. Click OK to continue.

To run this sample

  • Press F5.

Requirements

This application requires a modem installed on one of the COM ports.

Demonstrates

  • How to determine which COM ports are available.

  • How to use a COM port to communicate with a modem.

  • How to use Win32 API calls to control communication with the COM port.

See Also

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