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C: teste om en FILE er open.



Hejsa,
  Jeg er ved at debugge noget skod-kode og tror at en fwrite() nogle
gange fejler pga.
at output-stream er blevet lukket med fclose et andet sted.

Kan det lade sig gøre at teste på en variable af type "FILE *", om den er
lukket, åbnet ? 

Mvh
Martin
 
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