问题描述
我遇到一段代码问题，我每隔500毫秒执行一次，根据CPU利用率在托盘上绘制自定义图标（例如任务管理器）
代码工作得很好，只是在经过一段时间的运行后它会抛出一个通用的GDI错误，我不知道如何解决。
有没有人知道如何处理这种情况吗？
Im having an issue with a piece of code that i execute every 500ms to draw a custom icon on the tray based on the CPU utilization (as task manager does for example)
The code works just fine except that after a short period of ran it throws a generic GDI error that i have no idea how to resolve.
Does anyone knows how to handle this situation?
Dim bCPU As New Bitmap(16, 16)
Dim gCPU As Graphics = Graphics.FromImage(bCPU)
'Draw Grid
For i As Integer = 1 To 16 Step 2
gCPU.DrawLine(New Pen(Color.Green, 1), i, 0, i, 16)
gCPU.DrawLine(New Pen(Color.Green, 1), 0, i, 16, i)
Next
'Draw Value
Dim lines As Integer = CInt(Math.Round((16 / 100) * perf_MeterCPU.LastValue, 0))
For i As Integer = 0 To lines Step 1
gCPU.DrawLine(New Pen(Color.Lime, 1), 0, 16 - i, 16, 16 - i)
Next
'Draw Border
ControlPaint.DrawBorder3D(gCPU, 0, 0, 16, 16, Border3DStyle.SunkenInner)
TrayIconCPU.Icon = Icon.FromHandle(m_TrayBitmap.GetHicon)
bCPU.Dispose()
gCPU.Dispose()
例外bein抛出的是：
System.Runtime.InteropServices.ExternalException（0x80004005）：GDI +中发生了一般性错误。
The exception being thrown is:
System.Runtime.InteropServices.ExternalException (0x80004005): A generic error occurred in GDI+.
推荐答案
TrayIconCPU.Icon = Icon.FromHandle(m_TrayBitmap.GetHicon)
需要更改为：
needs to be changed to:
IntPtr Hicon = img.GetHicon();
Icon newIcon = Icon.FromHandle(Hicon);
TrayIconCPU.Icon = newIcon;
DestroyIcon(newIcon.Handle);
为了调用DestroyIcon方法，你需要在课堂上使用它：
In order to call the DestroyIcon method you'll need this in your class:
[System.Runtime.InteropServices.DllImport("user32.dll", CharSet = CharSet.Auto)]
extern static bool DestroyIcon(IntPtr handle);
你需要添加使用for System.Runtime.InteropServices：
And you'll need to add using for System.Runtime.InteropServices:
using System.Runtime.InteropServices;
只是想帮助将来可能遇到的其他人。
Just wanted to help out others that may come across this in the future.
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