> ## Documentation Index
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> Use this file to discover all available pages before exploring further.

# CAPLfunctionIso11783fswritefile

[Open topic with navigation](../../../../../../CANoeDEFamily.htm#Topics/CAPLFunctions/ISO11783/ISONodeLayer/Functions/CAPLfunctionIso11783fswritefile.md)

**CAPL Functions** » **ISO11783** » **ISO11783 Node Layer** » Iso11783FSWriteFile

# Iso11783FSWriteFile

[Valid for](../../../../Shared/FeatureAvailability.md): CANoe DE • CANoe4SW DE

## Function Syntax

```
long Iso11783FSWriteFile( dword fileHandle, dword bufferSize, char buffer[] );
long Iso11783FSWriteFile( dword fileHandle, dword bufferSize, byte buffer[] );
```

## Description

This function writes data to an open file.

**Note:** Contrary to the other file operations, this function does not provide any functionality for a passed directory handle.

## Parameters

* **fileHandle**: File handle, see also [Iso11783FSOpenFile](CAPLfunctionIso11783FSOpenFile.md)
* **bufferSize**: Number of bytes to write
* **buffer**: Data to write

## Return Values

* **\< 0**: [error code](../CAPLfunctionsISONLErrorCodes.md)
* **≥ 0**: number of written bytes

## Example

```c theme={null}
LONG handle;
char data[200];

handle = Iso11783FSOpenFile( "\test.TXT", 0x02 );
if (handle > 0) {
  Iso11783FSWriteFile( handle, 12, "Hello World!" );
  Iso11783FSCloseFile( handle );
}
```