【Delphi】VCL 使用TCoolBar控件，在系统触发UAC界面时，引发CMSysFontChanged事件导致界面卡死或弹出System Error 1400错误

在几个月前发现该问题，程序设置MainForm不可见，启动后使用ShellExecuteEx以管理员权限启动另外一个EXE。

在弹出系统UAC界面后，弹出System Error 1400错误，RAD10.2上未弹出错误，但在接下来的几秒钟程序占用CPU非常高， 

XE7编译的程序一旦出现错误，会导致delphi IDE窗口都被隐藏了，需要结束进程重新打开，调试状态下IDE弹出如下错误，和编译好的EXE弹出错误一致。

原因是由于IDE的MainForm设计窗口也打开了带有Tcoolbar控件的窗口，只要将该窗口关闭，则IDE不会报错，但包含该MainForm的EXE仍会出错，且会导致IDE被隐藏。

从客观上讲，报错流程如下，

1）运行XE7编译出来的程序（包含CoolBar控件，以及其他ToolBar，menu，button等）->

2）系统弹出UAC窗口（手动右键以管理员权限运行任意一个EXE都可以）

3）XE7和RAD10.2的IDE被隐藏（手动操作无法恢复窗口）

4）程序出现System Error 1400错误

5）打开包含相同控件窗口的XE7 IDE也会弹出System Error 1400错误

综上可以猜测，在错误发生过程中，系统弹出UAC时，会广播一些消息，而XE7程序和IDE（VCL内部控件）在处理消息过程中出现异常，并导致将程序所在窗口关闭。

通过错误日志可以看出在这过程中系统触发CMSysFontChanged消息事件，最终导致出错，而System Error 1400错误一般是在非UI线程操作UI控件导致的，

MSDN对WM_FONTCHANGE的说明也是指出该消息为顶层窗口广播消息。

经过测试，将coolbar替换成controlbar可以解决触发消息卡死问题。

另外，关于System Error 1400错误，经测试发现，是由于上面所说几个控件所在窗口仅创建但不显示时才会报错，而窗口显示则仅表现为界面卡死几秒钟（表现为程序界面快速刷新各个控件），因此替换为Controlbar可以解决卡死问题，但不能解决报错问题（测试发现简单的controlbar不会报错，但由于开发中一旦使用coolbar和controlbar，通常还会使用toolbar，假如在toolbar中再使用edit控件或combobox等，则同样会报错）。

本人最终是改变程序的设计，在不需要显示控件所在的窗口时，不创建该窗口，在需要显示时才创建，这样可以避免不显示窗口时报错，同时又解决显示窗口后卡死的问题。

附上IDE错误窗口和信息：

。

[5009EC9A]{rtl210.bpl  } System.SysUtils.RaiseLastOSError (Line 24533, "System.SysUtils.pas" + 6) + $2
[5009EC0F]{rtl210.bpl  } System.SysUtils.RaiseLastOSError (Line 24516, "System.SysUtils.pas" + 0) + $7
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[50640BB2]{vcl210.bpl  } Vcl.ComCtrls.TToolBar.CreateWnd (Line 22126, "Vcl.ComCtrls.pas" + 1) + $2
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[50060094]{rtl210.bpl  } System.TMonitor.TryEnter (Line 17596, "System.pas" + 10) + $0
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[50066A9C]{rtl210.bpl  } System.@IntfClear (Line 36046, "System.pas" + 10) + $0
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[506435F0]{vcl210.bpl  } Vcl.ComCtrls.TToolBar.CMSysFontChanged (Line 23848, "Vcl.ComCtrls.pas" + 2) + $2
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[505C76E2]{vcl210.bpl  } Vcl.Controls.TWinControl.WndProc (Line 10038, "Vcl.Controls.pas" + 153) + $6
[50060094]{rtl210.bpl  } System.TMonitor.TryEnter (Line 17596, "System.pas" + 10) + $0
[5005FC14]{rtl210.bpl  } System.TMonitor.Enter (Line 17289, "System.pas" + 4) + $2
[5070CE98]{vcl210.bpl  } Vcl.Forms.TCustomForm.WndProc (Line 4427, "Vcl.Forms.pas" + 206) + $5
[5005FA98]{rtl210.bpl  } System.TMonitor.CheckOwningThread (Line 17207, "System.pas" + 2) + $0
[5005FDA2]{rtl210.bpl  } System.TMonitor.Exit (Line 17393, "System.pas" + 1) + $2
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[505C9B37]{vcl210.bpl  } Vcl.Controls.TWinControl.CMSysFontChanged (Line 11652, "Vcl.Controls.pas" + 2) + $4
[50648721]{vcl210.bpl  } Vcl.ComCtrls.TCoolBar.CMSysFontChanged (Line 27037, "Vcl.ComCtrls.pas" + 1) + $2
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[520F0042]{vcldesigner210.bpl} VCLSurface.TVclDesignSurface.IsDesignMsg (Line 3586, "VCLSurface.pas" + 186) + $28
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[505C2C15]{vcl210.bpl  } Vcl.Controls.TControl.WndProc (Line 7232, "Vcl.Controls.pas" + 91) + $6
[50060094]{rtl210.bpl  } System.TMonitor.TryEnter (Line 17596, "System.pas" + 10) + $0
[5005FC14]{rtl210.bpl  } System.TMonitor.Enter (Line 17289, "System.pas" + 4) + $2
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[5005FDF3]{rtl210.bpl  } System.TMonitor.Exit (Line 17415, "System.pas" + 2) + $7
[50152E6E]{rtl210.bpl  } System.Classes.TInterfaceList.GetCount (Line 4843, "System.Classes.pas" + 5) + $9
[50066A9C]{rtl210.bpl  } System.@IntfClear (Line 36046, "System.pas" + 10) + $0
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[5005F5E3]{rtl210.bpl  } System.TObject.Dispatch (Line 16511, "System.pas" + 11) + $0
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[5005FC14]{rtl210.bpl  } System.TMonitor.Enter (Line 17289, "System.pas" + 4) + $2
[5005FA98]{rtl210.bpl  } System.TMonitor.CheckOwningThread (Line 17207, "System.pas" + 2) + $0
[5005FDA2]{rtl210.bpl  } System.TMonitor.Exit (Line 17393, "System.pas" + 1) + $2
[505C76E2]{vcl210.bpl  } Vcl.Controls.TWinControl.WndProc (Line 10038, "Vcl.Controls.pas" + 153) + $6
[50066A9C]{rtl210.bpl  } System.@IntfClear (Line 36046, "System.pas" + 10) + $0
[520F0042]{vcldesigner210.bpl} VCLSurface.TVclDesignSurface.IsDesignMsg (Line 3586, "VCLSurface.pas" + 186) + $28
[505C5E7E]{vcl210.bpl  } Vcl.Controls.TWinControl.GetControl (Line 9130, "Vcl.Controls.pas" + 4) + $A
[505C5ED5]{vcl210.bpl  } Vcl.Controls.TWinControl.Broadcast (Line 9159, "Vcl.Controls.pas" + 3) + $11
[505C9B37]{vcl210.bpl  } Vcl.Controls.TWinControl.CMSysFontChanged (Line 11652, "Vcl.Controls.pas" + 2) + $4
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[50172B18]{rtl210.bpl  } System.Classes.TObservers.IsObserving (Line 18590, "System.Classes.pas" + 11) + $20
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[505C9B37]{vcl210.bpl  } Vcl.Controls.TWinControl.CMSysFontChanged (Line 11652, "Vcl.Controls.pas" + 2) + $4
[505C2C15]{vcl210.bpl  } Vcl.Controls.TControl.WndProc (Line 7232, "Vcl.Controls.pas" + 91) + $6
[505C5ED5]{vcl210.bpl  } Vcl.Controls.TWinControl.Broadcast (Line 9159, "Vcl.Controls.pas" + 3) + $11
[505C9B37]{vcl210.bpl  } Vcl.Controls.TWinControl.CMSysFontChanged (Line 11652, "Vcl.Controls.pas" + 2) + $4
[5005F5E3]{rtl210.bpl  } System.TObject.Dispatch (Line 16511, "System.pas" + 11) + $0
[505C2C15]{vcl210.bpl  } Vcl.Controls.TControl.WndProc (Line 7232, "Vcl.Controls.pas" + 91) + $6
[5005F5E3]{rtl210.bpl  } System.TObject.Dispatch (Line 16511, "System.pas" + 11) + $0
[505C2C15]{vcl210.bpl  } Vcl.Controls.TControl.WndProc (Line 7232, "Vcl.Controls.pas" + 91) + $6
[5005F5E3]{rtl210.bpl  } System.TObject.Dispatch (Line 16511, "System.pas" + 11) + $0
[505C2C15]{vcl210.bpl  } Vcl.Controls.TControl.WndProc (Line 7232, "Vcl.Controls.pas" + 91) + $6
[505C76E2]{vcl210.bpl  } Vcl.Controls.TWinControl.WndProc (Line 10038, "Vcl.Controls.pas" + 153) + $6
[5070CE98]{vcl210.bpl  } Vcl.Forms.TCustomForm.WndProc (Line 4427, "Vcl.Forms.pas" + 206) + $5
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[50172B18]{rtl210.bpl  } System.Classes.TObservers.IsObserving (Line 18590, "System.Classes.pas" + 11) + $20
[520F870F]{vcldesigner210.bpl} VCLFormContainer.TControlSizer.ControlWndProc (Line 313, "VCLFormContainer.pas" + 33) + $C
[500636D0]{rtl210.bpl  } System.@FinalizeArray (Line 31435, "System.pas" + 139) + $0
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[505C5ED5]{vcl210.bpl  } Vcl.Controls.TWinControl.Broadcast (Line 9159, "Vcl.Controls.pas" + 3) + $11
[505C9B37]{vcl210.bpl  } Vcl.Controls.TWinControl.CMSysFontChanged (Line 11652, "Vcl.Controls.pas" + 2) + $4
[505C2C15]{vcl210.bpl  } Vcl.Controls.TControl.WndProc (Line 7232, "Vcl.Controls.pas" + 91) + $6
[505C5ED5]{vcl210.bpl  } Vcl.Controls.TWinControl.Broadcast (Line 9159, "Vcl.Controls.pas" + 3) + $11
[505C9B37]{vcl210.bpl  } Vcl.Controls.TWinControl.CMSysFontChanged (Line 11652, "Vcl.Controls.pas" + 2) + $4
[505C2C15]{vcl210.bpl  } Vcl.Controls.TControl.WndProc (Line 7232, "Vcl.Controls.pas" + 91) + $6
[505C9B37]{vcl210.bpl  } Vcl.Controls.TWinControl.CMSysFontChanged (Line 11652, "Vcl.Controls.pas" + 2) + $4
[505C2C15]{vcl210.bpl  } Vcl.Controls.TControl.WndProc (Line 7232, "Vcl.Controls.pas" + 91) + $6
[500635C0]{rtl210.bpl  } System.@FinalizeRecord (Line 31136, "System.pas" + 25) + $0
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[520F9CBA]{vcldesigner210.bpl} VCLFormContainer.TFormContainerForm.WndProc (Line 801, "VCLFormContainer.pas" + 19) + $4
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[505C9B37]{vcl210.bpl  } Vcl.Controls.TWinControl.CMSysFontChanged (Line 11652, "Vcl.Controls.pas" + 2) + $4
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[505C76E2]{vcl210.bpl  } Vcl.Controls.TWinControl.WndProc (Line 10038, "Vcl.Controls.pas" + 153) + $6
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[50644444]{vcl210.bpl  } Vcl.ComCtrls.TToolBar.WndProc (Line 24345, "Vcl.ComCtrls.pas" + 104) + $6
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[21192756]{designide210.bpl} EmbeddedFormDesigner.TEditorFormDesigner.WndProc (Line 317, "EmbeddedFormDesigner.pas" + 24) + $5
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[505C9B37]{vcl210.bpl  } Vcl.Controls.TWinControl.CMSysFontChanged (Line 11652, "Vcl.Controls.pas" + 2) + $4
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[505C5E7E]{vcl210.bpl  } Vcl.Controls.TWinControl.GetControl (Line 9130, "Vcl.Controls.pas" + 4) + $A
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[505C5E7E]{vcl210.bpl  } Vcl.Controls.TWinControl.GetControl (Line 9130, "Vcl.Controls.pas" + 4) + $A
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[505C2C15]{vcl210.bpl  } Vcl.Controls.TControl.WndProc (Line 7232, "Vcl.Controls.pas" + 91) + $6
[50686F6A]{vcl210.bpl  } Vcl.ExtCtrls.TCustomButtonedEdit.DefaultHandler (Line 8703, "Vcl.ExtCtrls.pas" + 1) + $4
[505C76E2]{vcl210.bpl  } Vcl.Controls.TWinControl.WndProc (Line 10038, "Vcl.Controls.pas" + 153) + $6
[505C9B37]{vcl210.bpl  } Vcl.Controls.TWinControl.CMSysFontChanged (Line 11652, "Vcl.Controls.pas" + 2) + $4
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[207BBE14]{coreide210.bpl} EditorForm.TEditWindow.CMSysFontChanged (Line 3801, "EditorForm.pas" + 0) + $8
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[5071635B]{vcl210.bpl  } Vcl.Forms.TApplication.ProcessMessage (Line 10352, "Vcl.Forms.pas" + 23) + $1
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[507166D1]{vcl210.bpl  } Vcl.Forms.TApplication.Run (Line 10520, "Vcl.Forms.pas" + 26) + $3