The INPUT$ function is used to receive data from the user's keyboard, an open file or an open port.
- result$ = INPUT$(numberOfBytes%[, fileOrPortNumber])
- Keyboard input is limited to the INTEGER numberOfBytes% (characters) designated by program.
- The keyboard is the default device when a file or port number is omitted. The numberOfBytes% is number of key presses to read.
- INPUT$ will wait until the number of bytes are read from the keyboard or port. One byte per loop is recommended with ports.
- RANDOM opened file bytes can be up to the LEN = recordLength statement, or 128 if no statement is used.
- fileOrPortNumber is the number that was used in the OPEN AS statement.
- Returns STRING values including spaces or even extended ASCII characters.
- Backspace key results in the CHR$(8) character being added to an entry.
- Use LOCATE , , 1 to view the cursor entry. Turn the cursor off using LOCATE , , 0.
- Use _DEST _CONSOLE before INPUT$ is used to receive input from a console window.
- numberOfBytes% could not exceed 32767 in BINARY files or a QBasic error would occur.
- Ctrl + Break would not interrupt the QBasic program until there was a full INPUT$ key entry. In QB64 Ctrl + Break will immediately exit a running program.
Example 1: A keyboard limited length entry can be made with a fixed blinking cursor. Entry must be completed before it can be shown.
LOCATE 10, 10, 1 'display fixed cursor at location year$ = INPUT$(4) 'waits until all 4 digits are entered PRINT year$ 'display the text entry
Example 2: Reading bytes from a text file for an 80 wide screen mode.
Example 3: Getting the entire text file data as one string value.
- Explanation: The IF statement gets the entire contents when the file size is less than 32768. The program can then work with the string by using MID$ or INSTR. Note: A text file string will also have CrLf line break end characters CHR$(13) + CHR$(10).
- INPUT, LINE INPUT (keyboard input)
- INPUT (file mode), INPUT #, LINE INPUT # (file input)
- OPEN, LOC (file)
- LOCATE (cursor on/off)