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std::feof

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C-style I / O
Puffern
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(veraltet)
Streams
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Streams
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Abstraktionen
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ios_base
basic_ios
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Datei-I / O
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File I/O
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Types
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streamoff
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iostream_category(C++11)
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C-style I / O
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Fehlerbehandlung
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clearerr
feof
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Operationen auf Dateien
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remove
rename
tmpfile
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Defined in header <cstdio>
int feof( FILE* stream );
Prüft, ob das Ende der angegebenen Datei-Stream erreicht wurde .
Original:
Checks if the end of the given file stream has been reached.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

stream -
der Datei-Stream zu überprüfen
Original:
the file stream to check
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[Bearbeiten] Rückgabewert

Null-Wert, wenn das Ende des Stroms erreicht ist, andernfalls 0 .
Original:
Nonzero value if the end of the stream has been reached, otherwise 0.
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[Bearbeiten] Notes

Diese Funktion meldet nur den Strom Staat als von der jüngsten I / O-Operation berichtet, ist es nicht untersuchen die zugeordneten Datenquellen. Zum Beispiel, wenn die neueste I / O war ein std::fgetc, das das letzte Byte einer Datei zurückgeführt, kehrt std::feof ungleich Null. Der nächste std::fgetc ausfällt und ändert den Strom Staat end-of-file. Erst dann std::feof Null zurück .
Original:
This function only reports the stream state as reported by the most recent I/O operation, it does not examine the associated data source. For example, if the most recent I/O was a std::fgetc, which returned the last byte of a file, std::feof returns non-zero. The next std::fgetc fails and changes the stream state to end-of-file. Only then std::feof returns zero.
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In der typischen Anwendung, stoppt Input Stream Processing bei jedem Fehler; feof und std::ferrror werden dann verwendet, um zwischen verschiedenen Fehlerbedingungen unterscheiden .
Original:
In typical usage, input stream processing stops on any error; feof and std::ferrror are then used to distinguish between different error conditions.
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[Bearbeiten] Beispiel

[edit]
#include <cstdio>
#include <cstdlib>
 
int main()
{
    FILE* fp = std::fopen("test.txt", "r");
    if(!fp) {
        std::perror("File opening failed");
        return EXIT_FAILURE;
    }
 
    int c; // note: int, not char, required to handle EOF
    while ((c = std::fgetc(fp)) != EOF) { // standard C I/O file reading loop
       std::putchar(c);
    }
 
    if (std::ferror(fp))
        std::puts("I/O error when reading");
    else if (std::feof(fp))
        std::puts("End of file reached successfully");
}


[Bearbeiten] Siehe auch

prüft, ob am Ende der Datei erreicht wurde
Original:
checks if end-of-file has been reached
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(öffentliche Elementfunktion of std::basic_ios) [edit]
löscht Fehler
Original:
clears errors
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(Funktion) [edit]
zeigt eine Zeichenfolge entspricht der aktuellen Fehler stderr
Original:
displays a character string corresponding of the current error to stderr
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(Funktion) [edit]
Prüfungen für eine Datei Fehler
Original:
checks for a file error
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(Funktion) [edit]