Microsoft KB Archive/73258

= FORTRAN 5.1 README.DOC: Windows Programming =

Article ID: 73258

Article Last Modified on 10/23/2003

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APPLIES TO


 * Microsoft FORTRAN Compiler 5.1
 * Microsoft FORTRAN Compiler 5.1

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This article was previously published under Q73258



SUMMARY
The following is the &quot;Windows Programming&quot; section from the FORTRAN version 5.10 README.DOC:                            README.DOC File Release notes for the Microsoft(R) FORTRAN Professional Development System, Version 5.1

This document contains release notes for version 5.1 of the Microsoft FORTRAN Professional Development System for MS-DOS(R) and the Microsoft Operating System/2 (MS(R) OS/2). The information in this document is more up-to-date than that in the manuals and the Microsoft Advisor (online help).

Microsoft improves its languages documentation at the time of reprinting, so some of the information in this file may already be in your manuals.

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< FORTRAN Programming with Microsoft Windows >============

Requirement for Windows Dynamic-Link Libraries --

All FORTRAN 5.1 dynamic-link libraries (DLLs) must explicitly export the symbol WEP. To do this, the statement

EXPORTS WEP

should be added to the DLL's module definition file. The WEP routine is included in the FORTRAN 5.1 startup code. If a DLL already has a user-defined WEP routine (for example, in a mixed-language DLL with existing C code), the WEP routine should be renamed _WEP. The FORTRAN 5.1 startup code will call _WEP, if present, during DLL termination. For additional information concerning the WEP function, see the Windows 3.0 SDK documentation.

Close All Files Before Exiting a Windows DLL

When a Windows DLL written in FORTRAN terminates, any information left in a file output buffer will be lost. This is a result of how DLLs are terminated in Windows. To ensure that all data is written to a file, explicitly CLOSE any open files in a DLL before the DLL is terminated. One way of doing this is by adding a function to the DLL code that closes all files, and calling this function just before the application terminates.

MessageBox Support ---

FORTRAN supports two modes of MessageBox for QuickWin applications, TASKMODAL and SYSTEMMODAL. TASKMODAL requires that you respond to the message box before the application will perform any further calculations; however, all other applications currently running will not be affected. SYSTEMMODAL requires you to respond before any application may run.

Maximizing Windows --

To maximize the frame window of a QuickWin application, place the following statement in the WIN.INI file:

[ ]    QWINMaximized=1

where is the base name of your executable file. For example, if the executable file is called PROGRAM.EXE, the value for would be PROGRAM.

Windows DLLs and Subprograms with String Arguments --

Don't pass char*(*) arguments to a subprogram residing in a Windows DLL. This is because the runtime in the calling DLL or EXE cannot communicate the length of the string with the runtime in the called DLL.


 * NOTE: *****************

The above paragraph in the README.DOC contains an error. char*(*) should be replaced by character*(*).

Additional query words: 5.10

Keywords: KB73258

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