GDI如何清除字符串呢
例如我想循环显示毫秒帮助里这样写的
#include <GuiConstantsEx.au3>
#include <GDIPlus.au3>
Opt('MustDeclareVars', 1)
_Main()
Func _Main()
Local $hGUI, $hGraphic, $hBrush, $hFormat, $hFamily, $hFont, $tLayout
; 创建 GUI
$hGUI = GUICreate("GDI+ 图形设备接口演示", 400, 300)
GUISetState()
; 绘制字符串
_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, "你好 世界!", $hFont, $tLayout, $hFormat, $hBrush)
; 循环到用户退出
Do
Until GUIGetMsg() = $GUI_EVENT_CLOSE
; 清理资源
_GDIPlus_FontDispose ($hFont)
_GDIPlus_FontFamilyDispose ($hFamily)
_GDIPlus_StringFormatDispose ($hFormat)
_GDIPlus_BrushDispose ($hBrush)
_GDIPlus_GraphicsDispose ($hGraphic)
_GDIPlus_ShutDown ()
EndFunc ;==>_Main
但是我把 _GDIPlus_GraphicsDrawStringEx ($hGraphic, "你好 世界!", $hFont, $tLayout, $hFormat, $hBrush)
放到一个循环里就不行了 新的显示了但是旧的也不消失
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