| [Overview][Constants][Types][Classes][Procedures and functions][Variables] | Reference for unit 'System' (#rtl) |
Open file for writing
Source position: line 0
procedure Rewrite( |
var f: file; |
l: LongInt |
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var f: file |
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var f: TypedFile |
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var t: Text |
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Rewrite opens a file F for writing. F can be any file type. If F is an untyped or typed file, then it is opened for reading and writing. If F is an untyped file, the record size can be specified in the optional parameter L. Default a value of 128 is used. if Rewrite finds a file with the same name as F, this file is truncated to length 0. If it doesn't find such a file, a new file is created. Contrary to Turbo Pascal, Free Pascal opens the file with mode fmoutput. If it should be opened in fminout mode, an extra call to Reset is needed. File sharing is not taken into account when calling Rewrite.
Depending on the state of the \var{\{\$I\}} switch, a runtime error can be generated if there is an error. In the \var{\{\$I-\}} state, use IOResult to check for errors.
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Open file for reading |
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Assign a name to a file |
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Close a file |
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Write file buffers to disk |
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Open a file in append mode |
Program Example52; { Program to demonstrate the Rewrite function. } Var F : File; I : longint; begin Assign (F,'Test.tmp'); { Create the file. Recordsize is 4 } Rewrite (F,Sizeof(I)); For I:=1 to 10 do BlockWrite (F,I,1); close (f); { F contains now a binary representation of 10 longints going from 1 to 10 } end.
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