Microsoft KB Archive/112388

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GETBASEIRQ EscapeCommFunction

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Q112388

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The information in this article applies to:


 * Microsoft Windows Software Development Kit (SDK) 3.1

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SUMMARY
By calling EscapeCommFunction with GETBASEIRQ as the nFunction parameter, an application can determine the base I/O port address and IRQ used for a specific communications port.

MORE INFORMATION
Although GETBASEIRQ is not documented in the Windows 3.1 SDK manuals, it is listed in the WINDOWS.H header file, and will continue to be supported in future versions of 16-bit Windows.

When calling EscapeCommFunction with GETBASEIRQ, the value returned is a LONG. The HIWORD of the return value is the IRQ and the LOWORD is the base I/O address of the communications port.

Please note that this function call does not indicate whether a UART exists at the port; it only returns the I/O base and IRQ that COMM.DRV would use for that port.

Additional query words: 3.10

Keywords : kb16bitonly

Issue type :

Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310