Using Visual FoxPro to convert a Clipper application

Visual FoxPro, a Microsoft product, can often be used to convert Clipper applications to Windows since the two products have quite a lot in common.

Clipper and Visual FoxPro emerged out of dBase in the late 1980’s. They share a common language base and have similar data file structures. This means that existing data files can often be used with little or no changes needed. Plus, at least some of the Clipper code can generally be used directly or with little modification in the FoxPro application. This greatly reduces the cost of conversion and speeds development time.

The database file structure (DBF files) in Clipper and Foxpro are virtually identical. Thus, Clipper data files can be used as is. No conversion is needed. Clipper often used FoxPro index files. If so, then the indexes can be used directly. If not, the the Clipper index files can easily be converted to the faster, more stable FoxPro index format.

FoxPro also supports non-native data formats like SQL Server and Oracle. However, this require changing how data is accessed inside the program.

While it is true that Microsoft will not be releasing future versions of Visual Foxpro, it is a robust and stable platform with a community of developers supporting it. Clipper hasn’t been updated in twenty years, yet there are still a multitude of Clipper applications still running.  Developers will be supporting Visual Foxpro years from now.

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xHarbour runs Clipper applications in Windows as is

xHarbour compiles and runs Clipper code as a console applications in Windows  with few if any changes needed.The console application will look and feel like the Clipper application. However, it will be a true Windows application and will run in any version of Windows, including 64-bit. It will also be able to address USB printers, which DOS-based Clipper applications can not do.

Sometimes, this is all a client wants or needs, with the added benefit that no re-training is needed since the new xHarbour application performs exactly the same as the Clipper application.

xHarbour will only compile native Clipper code. Some Clipper applications used third party libraries of code for increased functionality. If so, that code may need to be rewritten.

With xHarbour, an existing Clipper application can be converted to Windows with minimal time and cost, assuming that a DOS look and feel is suitable for the purpose.

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Decompiling FoxPro and Clipper

FoxPro and Clipper programs are created from source code files that are assembled into an executable program by compiling then linking the code to create an EXE that can be run without needing the source code. Decompiling FoxPro and Clipper recovers source code from EXEs by using specialized programs.

Over the course of years, Clipper and FoxPro source code often disappears or is out of date. Migrating these applications to Windows and the cloud is far easier is source code is available because then you can determine exactly what the application is doing.

We have decompilers for both FoxPro and Clipper. The FoxPro decompiler always works, assuming the code wasn’t encrypted.. The Clipper decompiler often will but doesn’t always. It depends on how the program was linked. We charge $75 to decompile and you only pay if it was successful.

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Servoy uses existing Visual FoxPro data to create cloud apps

Servoy is a rapid application development suite that shares language syntax with Visual FoxPro.

“Servoy is the ideal dynamic and data-centric development platform for Visual FoxPro developers. Beyond a great platform to evolve Visual FoxPro applications, Servoy also offers cross-platform (Windows, Mac, and Linux) for development and runtime, cloud computing scenarios, and cross browser with mobile web development. Servoy is the logical evolution for FoxPro applications and VFP developers into the next decade.” – Ken Levy, former Microsoft Visual FoxPro product manager

Thus, Visual FoxPro applications (and Clipper applications that have been converted to Visual Foxpro) can live on in the cloud.

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