Reading Text Files

What is translated > File Input and Output > Reading Text Files

Read and ReadLn read values from a TextFile.

Calls without an explicit file parameter read from the predefined Input file.

READ

Read reads a value without automatically moving to the next line.

char character = '\0';

int number = 0;

string text = string.Empty;

Read(myFile, ref character);

Read(myFile, ref number);

Read(myFile, ref text);

Character input reads one character.

Numeric input skips leading white space and reads the next numeric value.

String input reads the remaining characters of the current line.

READLN

ReadLn reads a value and then consumes the rest of the current line, including the line ending.

ReadLn(myFile, ref text);

ReadLn without a value skips the remaining part of the current line:

ReadLn(myFile);

Calls without a file parameter use Input:

ReadLn(ref text);

EOF

Eof returns true when no more data can be read.

while (!Eof(myFile))

{

    ReadLn(myFile, ref text);

}

For typed and untyped files, Eof compares the current stream position with the file length.

The parameterless Eof function uses Input:

while (!Eof())

{

    ReadLn(ref text);

}

EOLN

Eoln is available for text files.

It returns true when the next character is a line ending or when the end of the file has been reached.

if (Eoln(myFile))

    ReadLn(myFile);

The parameterless Eoln function uses Input.

This page belongs to the Delphi2C# Documentation