File.Len() Method
Version: Available or changed with runtime version 1.0.
Gets the length of an ASCII or binary file.
Note
This method is supported only in Business Central on-premises.
Syntax
Length := File.Len()
Note
This method can be invoked using property access syntax.
Note
This method can be invoked without specifying the data type name.
Parameters
File
Type: File
An instance of the File data type.
Return Value
Length
Type: Integer
Remarks
This method is often used with Pos Method (File) and Seek Method (File).
Example
The following example opens a text file that is named 'C:\TestFolder\TestFile.txt' and contains the text ‘Hello World’. The Seek Method (File) sets a pointer to position 6 in the file. The Read Method (File) reads the file and stores the retrieved contents in the varString variable. The LEN method 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 Method (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 global variables.
var
Testfile: File;
varString: Text[200];
varLength: Integer;
begin
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);
end;