# Function Reference

# _SendMessageA

Send a Message to a Window/Control (Force Ansi Call)

#include <SendMessage.au3>
_SendMessageA ( $hWnd, $iMsg [, $wParam = 0 [, $lParam = 0 [, $iReturn = 0 [, $wParamType = "wparam" [, $lParamType = "lparam" [, $sReturnType = "lresult"]]]]]] )

## Parameters

$hWnd | Window/control handle
$iMsg | Message to send to control (number)
$wParam | [optional] Specifies additional message-specific information
$lParam | [optional] Specifies additional message-specific information
$iReturn | [optional] What to return: 0 - Return value from DLL call 1 - $ihWnd 2 - $iMsg 3 - $wParam 4 - $lParam <0 or > 4 - array same as DllCall
$wParamType | [optional] See DllCall in Related
$lParamType | [optional] See DllCall in Related
$sReturnType | [optional] See DllCall in Related

## Return Value

Success: | the user selected value from the DllCall() result.
Failure: | sets the @error flag to non-zero.

## Remarks

When a message is blocked by UIPI the last error, retrieved with _WinAPI_GetLastError(), is set to 5 (access denied).

## Related

DllCall, _SendMessage, _WinAPI_GetLastError