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interfaces:gdx_error_message_msg_file_version_not_supported [2008/06/17 15:55]
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-====== (GDX error message)*** Msg: File version not supported ====== 
  
- 
-Version 22.3 of GAMS introduced a new format (version 6) to store gdx files in a compressed form with some significant savings both in file size and writing time. However we were forced to break backwards compatibility. ​ We objected to do this but we couldn'​t introduce compression without doing so.  ​ 
- 
-Thus prior versions used version 5 and can not read the format of version 6. If this is the case you will get an error: 
-<​code>​ 
-c:​\test\gdx2veda test 
-*** Could not open GDX: test.gdx 
-*** Msg: File version not supported 
-c:​\test\>​ 
-</​code>​ 
- 
-Solution: Use the utility ''​gdxcopy''​ to convert from the newer file format to an older one. This utility is part of current distributions. ​ 
- 
-If you are not sure which version of GAMS has been used to create that gdx file, use the tool ''​gdxdump'' ​ to inspect the contents of your gdx file.  The gdxdump ​ option ''​-v''​ gives you the GDX version info for your GDX file: look at the "file format"​ line.  ​ 
- 
- 
-For example, I can print version info from a GDX file generated by 22.7, convert it, and verify the conversion like this: 
-<​code>​ 
-C:​\models\tmp>​C:​\gams_64\22.7.2\gdxdump v227.gdx -v 
-*  GDX dump of v227.gdx 
-*  Library in use : C:​\gams_64\22.7.2 
-*  Library version: GDX Library ​     May  1, 2008 22.7.2 WEX 4701.4799 WEI x86_64/MS Windows 
-*  File version ​  : GDX Library ​     May  1, 2008 22.7.2 WEX 4701.4799 WEI x86_64/MS Windows 
-*  Producer ​      : GAMS Base Module May  1, 2008 22.7.2 WEX 4648.4799 WEI x86_64/MS Windows 
-*  File format ​   :    7 
-*  Compression ​   :    0 
-*  Symbols ​       :   12 
-*  Unique Elements: ​   5 
- 
-C:​\models\tmp>​C:​\gams_64\22.7.2\gdxcopy -V6U v227.gdx xxx 
-Writing files to: .\.\xxx 
-Converting file: .\v227.gdx 
- 
-C:​\models\tmp>​C:​\gams_64\22.7.2\gdxdump xxx/​v227.gdx -v 
-*  GDX dump of xxx/​v227.gdx 
-*  Library in use : C:​\gams_64\22.7.2 
-*  Library version: GDX Library ​     May  1, 2008 22.7.2 WEX 4701.4799 WEI x86_64/MS Windows 
-*  File version ​  : _GAMS_GDX_237_2007-01-09 
-*  Producer ​      : GAMS Base Module May  1, 2008 22.7.2 WEX 4648.4799 WEI x86_64/MS Windows 
-*  File format ​   :    6 
-*  Compression ​   :    0 
-*  Symbols ​       :   12 
-*  Unique Elements: ​   5 
-</​code>​ 
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