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Today I struggled with the following. I tried to use a copy my MAP file in the Chameleon samples by renaming it to world_wms.map. But then I got: Error rendering map image. A fatal error has occurred .... please restart the application. When digging into this, I found this was caused by my MAP file missing a REFERENCE object, and my template having a KeyMapDHTML widget. But it took a lot of digging :). The cause is apparently in the generated session MAP file which gets a default extent of -1 -1 -1 which causes this: REFERENCE COLOR 255 0 0 EXTENT -1 -1 -1 -1 IMAGE "C:\ms4w\apps\chameleon\samples\htdocs/images/world_key.png" OUTLINECOLOR 0 0 0 SIZE 0 0 STATUS OFF MARKER 0 MARKERSIZE 0 MINBOXSIZE 3 MAXBOXSIZE 0 END Can anything be done about this?
This is odd. Did you provide valid extents in your widget attributes? MapServer will automatically create a default reference object if the mapfile doesn't contain one. I suspect that you didn't provide extents in your widget and that caused the problem. The fix would be to test the extents of the reference object if extents are not provided as part of the widget definition. Unfortunately there is no way to do conditionally optional attributes (i.e. minx only required if extents not set in reference object) so it will have to be manually tested in the widget intialization and an appropriate error message emitted if the extents are -1 -1 -1 -1. Bart, are you willing to investigate a fix for this?
The extents were probably not valid since I just used the Chameleon sample applications and then my own MAP file for Netherlands RD system. I will try to investigate this.
