# fsVarsAVarBufferSet<no value>
The **fsVarsAVarBufferSet** function can be used to set the value of a specific `AVar` stored as an abstract buffer (including strings and LLA / PBH vectors)

 

##### Syntax

``` wasm
FsVarError fsVarsAVarBufferSet(
    FsAVarId aVarId,
    FsUnitId unitId,
    FsVarParamArray param,
    void* buffer,
    int bufferSize,
    FsObjectId target
);
```

 

##### Parameters

<table><thead><tr class="header"><th>Parameters</th><th>Description</th></tr></thead><tbody><tr class="odd"><td><code>aVarId</code></td><td><p>The ID of an <code>AVar</code> (found using <code>fsVarsGetAVarId</code>).</p></td></tr><tr class="even"><td><code>unitId</code></td><td>The ID of an unit (found using <code>fsVarsGetUnitId</code>).</td></tr><tr class="odd"><td><code>param</code></td><td>A parameter which might be mandatory to access the <code>AVar</code> (in the case of an indexed <code>AVar</code>, for example). Elements in <code>param</code> can be <code>FsCrc</code>, <code>String</code> or <code>index</code>.</td></tr><tr class="even"><td><code>buffer</code></td><td>The buffer that contains the new value of the <code>AVar</code>.</td></tr><tr class="odd"><td><code>bufferSize</code></td><td>The size of the given buffer in bytes.</td></tr><tr class="even"><td><code>target</code></td><td><p>The ID of the object on which the variable is being set.</p></td></tr></tbody></table>

 

##### Return Values

The function returns a `FsVarError`, where 0 means there is no error (in which case, the value of the `AVar` has been set in `result`).

 

##### Remarks

If the `AVar` is smaller than the given `buffer`, only the first bytes will be copied in the `AVar`.

 

##### Example

``` wasm
FsUnitId unitId = fsVarsGetUnitId("String");
FsAVarId aVarId = fsVarsGetAVarId("ATC AIRLINE");
char buffer[128];
buffer[0] = '\0';
if (fsVarsAVarBufferGet(aVarId, unitId, {}, buffer, sizeof(buffer)) == FS_VAR_ERROR_NONE)
{
    // valid
}
else
{
    // error
}
```