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- Handling errors
- Position in the file
- Managing the ANSI/UNICODE format
fWriteLine (Function) In french: fEcritLigne Writes a line to an external file. The characters required to go to the next line are automatically inserted at the end of the added line.
Syntax
Writing a line to an external file Hide the details
<Result> = fWriteLine(<File used> , <Line to write>)
<Result>: Boolean - True if the write operation was performed to the specified file,
- False if an error occurs. To get more details on the error, use ErrorInfo with the errMessage constant.
<File used>: Integer or DiskFile variable
<Line to write>: Character string Line to be written to the file (up to 2GB). Remarks Handling errors fWriteLine throws an error in the following cases: - the file is not opened,
- the file is not accessible in write mode,
- the file is locked by another computer or by another application,
- no disk space is available.
Caution: fWriteLine can only be used on text files. This function does not support the binary 0 (the write operation is stopped). Position in the file When opening a file, the current position corresponds to: - the first file byte (by default),
- the last byte of the file is the file is opened in "addition" mode (foAdd constant).
This position can be modified by fSeek. fWriteLine writes the specified elements from the current position. Once fWriteLine has been executed, the current position is set to the last byte written. Managing the ANSI/UNICODE format fWriteLine is used to write: - a Unicode string in a Unicode file.
- an Ansi string in an Ansi file.
The file is created or opened with fCreate/ fOpen by specifying the file type. Remarks: - The size to be written to a Unicode file must be multiplied by two compared to an ANSI file.
- If an ANSI string is written to a UNICODE file and vice versa, the conversion will be implicitly performed.
| | | | | Format of the string passed as parameter | External file
in ANSI format
(fOpen or fCreate associated with the foAnsi constant) | External file
in UNICODE format
(fOpen or fCreate associated with the foUnicode constant) | | fWriteLine function | ANSI | No conversion is required before the write operation | Automatic conversion of the string before the write operation | | UNICODE | Automatic conversion of the string before the write operation | No conversion is required before the write operation |
In WINDEV and WEBDEV projects, if the "Use ANSI strings at runtime" option is enabled in the project configuration description, the default opening mode is foAnsi (1st column). In WINDEV and WEBDEV projects, if the "Use UNICODE strings at runtime" option is enabled in the project configuration description, the default opening mode is foUnicode (second column). In the WINDEV Mobile projects, regardless of the version and mode, the opening mode used by default is foUnicode (second column).
Related Examples:
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Unit examples (WINDEV): Handling text files
[ + ] Handling "text" files with WINDEV: - Create a text file - Write into a text file - Read in a text file
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Unit examples (WEBDEV): Handling text files
[ + ] This example explains how to handle "non HFSQL" files with WEBDEV and it allows you to: - Create a text file - Write into a text file - Read in a text file
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Unit examples (WINDEV Mobile): Handling text files
[ + ] Handling external "text" files: - Create a text file - Write into a text file - Read in a text file
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Unit examples (WINDEV): The TableTo functions
[ + ] Exporting table data with the WLanguage functions. The following topics are presented in this example: 1/ interfacing with Word and Excel 2/ sending data to the clipboard 3/ generating a text file This example explains how to export the content of a table to a Word document, an Excel workbook, the clipboard or a text file via the following WLanguage functions: TableToWord, TableToExcel, ToClipboard, TableToText.
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Business / UI classification: Business Logic
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