Microsoft KB Archive/136995

= How the Visual FoxPro Setup Wizard Compresses Large Files =

Article ID: 136995

Article Last Modified on 2/12/2000

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APPLIES TO


 * Microsoft Visual FoxPro 3.0 Standard Edition

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This article was previously published under Q136995



SUMMARY
The FoxPro 2.6 Setup Wizard had some limitations when it distributed large files. The Visual FoxPro 3.0 Setup Wizard has improved capabilities. This article describes how large files are handled and ways to customize the handling of large files.



MORE INFORMATION
When the Setup Wizard compresses files for assembly into disk images, it ensures that the files do not exceed the limit (in bytes) defined by the SplitSize value in the Preferences section of Wzsetup.ini. By default, this value is 363,520.

Files that fall below this limit are renamed with a $ in the filetype. For example, a 234,738-byte file named Mydata.dbf is compressed into:   MYDATA.DB$    61,638 Files that exceed this limit are chopped into pieces. The pieces are given a generated filename and an extension that indicates the order in which they are re-assembled when installed on the target computer. For example, a 4,415,168-byte file named Mydata.fpt might be divided and compressed into:   56600245.001   263,446 56600245.002  344,833   56600245.003   335,156   56600245.004   323,052   56600245.005   273,779 During installation on the target computer, these files are decompressed and reassembled into Mydata.fpt.

If you need to reassemble this table without running the setup program, you can use Expand.exe to expand each piece; then copy the expanded pieces of the memo file into the final memo file:   EXPAND MYDATA.DB$ MYDATA.DBF EXPAND 56600245.001 MYDATA.001 EXPAND 56600245.002 MYDATA.002 EXPAND 56600245.003 MYDATA.003 EXPAND 56600245.004 MYDATA.004 EXPAND 56600245.005 MYDATA.005 COPY MYDATA.001+MYDATA.002+MYDATA.003+MYDATA.004+MYDATA.005 MYDATA.FPT To determine the original name of a compressed file, refer to the Application section of the Setup.inf file that is written to DISK1 (or NETSETUP) of the disk image directories: [Application] "56592553"=1,MYDATA.DB$,,,,,,,,!READONLY,,MYDATA.DBF,,,,234738,,,,,VITAL "56592734"=1,56600245.001,,,,,,,,!READONLY,,MYDATA.FPT,,,,727040,,,,,VITAL "56592734"=1,56600245.002,MYDATA.FPT,,,,,,,!READONLY,,,,,,952832,,,,,VITAL "56592734"=1,56600245.003,MYDATA.FPT,,,,,,,!READONLY,,,,,,953856,,,,,VITAL "56592734"=1,56600245.004,MYDATA.FPT,,,,,,,!READONLY,,,,,,982528,,,,,VITAL "56592734"=1,56600245.005,MYDATA.FPT,,,,,,,!READONLY,,,,,,798912,,,,,VITAL The default SplitSize value of 363,520 is held over from the FoxPro version 2.6 Setup Wizard, which was able to generate 360K disk images and needed to ensure that files would not exceed the capacity of a 360K disk. While the version 3.0 Setup Wizard does not generate 360K disk images, the SplitSize value of 353,520 provides improved flexibility when assembling files into 1.2-MB and 1.44-MB disk images.

The version 3.0 Setup Wizard is able to split a file into hundreds of pieces by using a numeric file extension. The file extension may extend from 001 to 999, but a directory limitation (or setup limitation) may be encountered before getting that far.

The SplitSize setting may be increased to cause the Setup Wizard to create larger chunks when it splits large files. Do this by modifying the SplitSize setting in Wzsetup.ini. Do not use a setting greater than the number of bytes that will fit on 1.2-MB disks (or 1.44-MB disks). Some experimentation and testing may be required to arrive at settings that work well for the specific application.

Additional query words: VFoxWin

Keywords: KB136995

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