名前空間
変種
操作

fopen

提供: cppreference.com
< c‎ | io

 
 
File input/output
機能します
Original:
Functions
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ファイルアクセス
Original:
File access
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直接入力/出力
Original:
Direct input/output
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fread
fwrite
書式なし入力/出力
Original:
Unformatted input/output
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書式付き入力/出力
Original:
Formatted input/output
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ファイル位置付け
Original:
File positioning
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ftell
fgetpos
fseek
fsetpos
rewind
エラー処理
Original:
Error handling
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clearerr
feof
ferror
perror
ファイルに対する操作
Original:
Operations on files
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remove
rename
tmpfile
tmpnam
 
Defined in header <stdio.h>
FILE *fopen( const char *filename, const char *mode );
filenameによって示されたファイルを開き、そのファイルに関連付けられたファイルストリームを返します。 modeは、ファイル·アクセス·モードを決定するために使用され.
Original:
Opens a file indicated by filename and returns a file stream associated with that file. mode is used to determine the file access mode.
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[編集] パラメータ

filename -
にファイルストリームを関連付けるファイル名
Original:
file name to associate the file stream to
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mode -
ファイル·アクセス·モードを決定する、NULLで終わる文字列
File access
mode string
Meaning Explanation Action if file
already exists
Action if file
does not exist
"r" read Open a file for reading read from start failure to open
"w" write Create a file for writing destroy contents create new
"a" append Append to a file write to end create new
"r+" read extended Open a file for read/write read from start error
"w+" write extended Create a file for read/write destroy contents create new
"a+" append extended Open a file for read/write write to end create new
File access mode flag "b" can optionally be specified to open a file in binary mode. This flag has effect only on Windows systems.
On the append file access modes, data is written to the end of the file regardless of the current position of the file position indicator.
Original:
null-terminated character string determining file access mode
File access
mode string
Meaning Explanation Action if file
already exists
Action if file
does not exist
"r" read Open a file for reading read from start failure to open
"w" write Create a file for writing destroy contents create new
"a" append Append to a file write to end create new
"r+" read extended Open a file for read/write read from start error
"w+" write extended Create a file for read/write destroy contents create new
"a+" append extended Open a file for read/write write to end create new
File access mode flag "b" can optionally be specified to open a file in binary mode. This flag has effect only on Windows systems.
On the append file access modes, data is written to the end of the file regardless of the current position of the file position indicator.
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[編集] 値を返します

失敗した場合にNULL、成功した場合にファイルストリームをオープンしました
Original:
Opened file stream on success, NULL on failure
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[編集] も参照してください

ファイルを閉じます
Original:
closes a file
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(機能) [edit]
実際のファイルで出力ストリームを同期させます
Original:
synchronizes an output stream with the actual file
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(機能) [edit]
別の名前で既存のストリームを開きます
Original:
open an existing stream with a different name
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(機能) [edit]