Create a String Format object
#include <GDIPlus.au3>
_GDIPlus_StringFormatCreate ( [$iFormat = 0 [, $iLangID = 0]] )
| $iFormat | [optional] Format flags. Can be one or more of the following: 0x0001 - Specifies that reading order is right to left 0x0002 - Specifies that individual lines of text are drawn vertically on the display device 0x0004 - Specifies that parts of characters are allowed to overhang the string's layout rectangle 0x0020 - Specifies that Unicode layout control characters are displayed with a representative character 0x0400 - Specifies that an alternate font is used for characters that are not supported in the requested font 0x0800 - Specifies that the space at the end of each line is included in a string measurement 0x1000 - Specifies that the wrapping of text to the next line is disabled 0x2000 - Specifies that only entire lines are laid out in the layout rectangle 0x4000 - Specifies that characters overhanging the layout rectangle and text extending outside the layout rectangle are allowed to show | 
| $iLangID | [optional] The language to use | 
| Success: | a handle to a string format object. | 
| Failure: | 0 and sets the @error flag to non-zero, @extended may contain GPSTATUS error code ($GDIP_ERR* see GPIPlusConstants.au3). | 
When you are done with the String Format object, call _GDIPlus_StringFormatDispose() to release the resources.
_GDIPlus_StringFormatDispose, _GDIPlus_StringFormatSetAlign
Search GdipCreateStringFormat in MSDN Library.
#include <GDIPlus.au3>
#include <GUIConstantsEx.au3>
Example()
Func Example()
    Local $hGUI, $hGraphic, $hBrush, $hFormat, $hFamily, $hFont, $tLayout
    ; Create GUI
    $hGUI = GUICreate("GDI+", 400, 300)
    GUISetState(@SW_SHOW)
    ; Draw a string
    _GDIPlus_Startup()
    $hGraphic = _GDIPlus_GraphicsCreateFromHWND($hGUI)
    $hBrush = _GDIPlus_BrushCreateSolid(0xFF00007F)
    $hFormat = _GDIPlus_StringFormatCreate()
    $hFamily = _GDIPlus_FontFamilyCreate("Arial")
    $hFont = _GDIPlus_FontCreate($hFamily, 12, 2)
    $tLayout = _GDIPlus_RectFCreate(140, 110, 100, 20)
    _GDIPlus_GraphicsDrawStringEx($hGraphic, "Hello world", $hFont, $tLayout, $hFormat, $hBrush)
    ; Loop until the user exits.
    Do
    Until GUIGetMsg() = $GUI_EVENT_CLOSE
    ; Clean up resources
    _GDIPlus_FontDispose($hFont)
    _GDIPlus_FontFamilyDispose($hFamily)
    _GDIPlus_StringFormatDispose($hFormat)
    _GDIPlus_BrushDispose($hBrush)
    _GDIPlus_GraphicsDispose($hGraphic)
    _GDIPlus_Shutdown()
EndFunc   ;==>Example