LEN Function (File)
Gets the length of an ASCII or binary file.
Syntax
Length := File.LEN
Parameters
File
Type: File
Use this variable to refer to the file.
Property Value/Return Value
Type: Integer
The length of the file in bytes.
Remarks
This function is often used with POS Function (File) and SEEK Function (File).
Example
The following example opens a text file that is named 'C:\TestFolder\TestFile.txt' and contains the text ‘Hello World’. The SEEK Function (File) sets a pointer to position 6 in the file. The READ Function (File) reads the file and stores the retrieved contents in the varString variable. The LEN function retrieves the length of the file and stores it the varLength variable. The text that is read starts from the position of the pointer, so the text ‘World’ and the length of 12 are displayed in the message box. The length of the file is not affected by the SEEK Function (File). This example assumes that you have created the text file that is named C:\TestFolder\TestFile.txt and contains the text ‘Hello World’. This example requires that you create the following variables in the C/AL Globals window.
| Variable name | DataType | Length |
|---|---|---|
| Testfile | File | Not applicable |
| varString | Text | 200 |
| varLength | Integer | Not applicable |
Testfile.OPEN('C:\TestFolder\TestFile.txt');
Testfile.SEEK(6);
Testfile.READ(varString);
varLength := Testfile.LEN;
MESSAGE('The text is: %1. The length of the file is: %2', varString, varLength);