开发的一个软件，工作三个半小时后出现“Canvas does not allow drawing”

fangyan198707 2012-06-11 03:42:39

主界面用到的Tab空间和树形控件，底层有数据上传到上位机，上位机软件将数据处理后实时插入到控件，但软件工作三个半小时后出现“Canvas does not allow drawing”，有哪位大虾碰见过这种情况吗？求指导。谢谢！

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lwq222121 2015-01-12

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引用 3 楼 GPR0310 的回复:

楼主，你这个问题怎么解决的？我也碰到这个问题了，能否赐教，急啊

http://bbs.csdn.net/topics/190060934

明日船长 2015-01-12

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楼主，你这个问题怎么解决的？我也碰到这个问题了，能否赐教，急啊

fangyan198707 2012-06-12

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恳请大家帮忙指点一二

fangyan198707 2012-06-11

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在线等~~这个问题我发现有段时间了，之前忙着实现别的功能就没管这个，现在要做成产品了，这个问题必须解决，就各位帮下我，谢谢！

delphi XE 2011 reset

Version 1.7 ----------- - ADD: Delphi/CBuilder 10.2 Tokyo now supported. - ADD: Delphi/CBuilder 10.1 Berlin now supported. - ADD: Delphi/CBuilder 10 Seattle now supported. - ADD: Delphi/CBuilder XE8 now supported. - ADD: Delphi/CBuilder XE7 now supported. - ADD: Delphi/CBuilder XE6 now supported. - ADD: Delphi/CBuilder XE5 now supported. - ADD: Delphi/CBuilder XE4 now supported. - ADD: Delphi/CBuilder XE3 now supported. - ADD: Delphi/CBuilder XE2 now supported. - ADD: Delphi/CBuilder XE now supported. - ADD: Delphi/CBuilder 2010 now supported. - ADD: Delphi/CBuilder 2009 now supported. - ADD: New demo project FlexCADImport. - FIX: The height of the TFlexRegularPolygon object incorrectly changes with its rotation. - FIX: Added division by zero protect in method TFlexControl.MovePathSegment. - FIX: The background beyond docuemnt wasn't filled when TFlexPanel.DocClipping=True. - FIX: In "Windows ClearType" font rendering mode (OS Windows mode) the "garbage" pixels can appear from the right and from the bottom sides of the painted rectangle of the TFlexText object. - FIX: The result rectangle incorrectly calculated in the TFlexText.GetRefreshRect method. - FIX: Added FPaintCache.rcPaint cleanup in the TFlexPanel.WMPaint method. Now it is possible to define is the drawing take place via WMPaint or via the PaintTo direct call (if rcPaint contain non-empty rectangle then WMPaint in progress). - FIX: The TFlexPanel.FPaintCache field moved in the protected class section. Added rcPaint field in FPaintCache that represents drawing rectangle. - ADD: In the text prcise mode (TFlexText.Precise=True) takes into account the rotation angle (TFlexText.Angle). - FIX: Removed FG_NEWTEXTROTATE directive (the TFlexText Precise mode should be used instead). - FIX: The TFlexRegularPolygon object clones incorrectly drawed in case when TFlexRegularPolygon have alternative brush (gradient, texture). - ADD: Add TFlexPanel.InvalidateControl virtual method which calls from TFle

如果您需要使用其他画布,则必须分配HDC,例如varWindowHandle:HWND;ScreenCanvas,BufferCanvas: TCanvas;r,r2: TRect;ScreenDC,BufferDC :HDC;BufferBitmap : HBITMAP;beginWindowHandle := 0;ScreenCanvas := TCanvas.Create;BufferCan...

/// GDI+ library API access// - adds GIF, TIF, PNG and JPG pictures read/write support as standard TGraphic// - make available most useful GDI+ drawing methods// - allows Antialiased rending of any EM...

在调试delphi应用程序时，会在程序运行几秒后，突然出现这个错误。一般这个错误都是出现在使用线程时，因为在使用Thread时，所有的关于UI的代码都要进行同步，否则，就会出现这个错误，既然知道了错误原因，也就找到了解决方法。即使是简单地显示一个消息对话框，也要将他单独写为一个方法，然后在使用该方法时，必须进行同步。如下： procedu...

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