调用GDI+ ()时GDI+中的泛型错误

Question

我正在编写一个应用程序，作为其中的一部分，它在罗技G15v2键盘的液晶显示器上绘制一幅图像。在大多数情况下，该函数工作良好，但运行一段时间后，其中一行将抛出一个"Generic Error in GDI+“。

根据堆栈跟踪，问题出现在Bitmap.GetHbitmap()中。

at System.Drawing.Bitmap.GetHbitmap(Color background)
at System.Drawing.Bitmap.GetHbitmap()
    at CSCI171_TermProject.G15.Tick(Single Interval) in C:\Users\Sukasa\CSCI171\Term Project\CSCI171-TermProject\G15.vb:line 45"

我读过一些提到此错误的线程，但这是在保存文件的上下文中，而不是在获取其关联的HBitmap的上下文中。谁比我有更多的GDI+经验，能够提供任何想法，是什么原因造成这个问题？

为了获得更好的参考，下面是完整的代码模块：

Public Module G15
    Private G15 As New G15Lib.G15Interface
    Private G15BaseImage As New Bitmap("GFX\G15-BGImg.png")
    Private G15Minimap As New Bitmap(43, 43, Imaging.PixelFormat.Format32bppArgb)
    Private G15HeartMonitor As New Bitmap(44, 17, Imaging.PixelFormat.Format32bppArgb)
    Private G15Heartbeat As New Bitmap("GFX\G15-HB.png")
    Private G As Graphics = Graphics.FromImage(G15BaseImage)
    Private G15On As Boolean = False

    Public Sub Init()
        If Not G15.G15Detected Then
            Log.Write("Get extra content by connecting a G15")
            Return
        End If
        G15On = True
        G15.LCD.initLCD(AppName)
        G15.LEDs.setKeyboardLight(2)
        G15.LCD.showBitmap(G15BaseImage.GetHbitmap, 1)
        Log.Write("Logitech G15 Features Enabled")
    End Sub

    Public Sub Tick(ByVal Interval As Single)
        Const StepTime As Single = 0.09
        If Not G15On Then Return

        Static HeartTime As Single = StepTime
        HeartTime -= Interval
        If HeartTime <= 0 Then
            HeartTime = StepTime
            AnimateHeartbeat()
        End If

        MakeMinimap()

        G.DrawImage(G15Minimap, New Rectangle(0, 0, 43, 43), New Rectangle(0, 0, 43, 43), GraphicsUnit.Pixel)
        G.DrawImage(G15HeartMonitor, New Rectangle(116, 0, 44, 17), New Rectangle(0, 0, 44, 17), GraphicsUnit.Pixel)

        Try
            G15.LCD.showBitmap(G15BaseImage.GetHbitmap, 1)
        Catch ex As Exception
            G15On = False
            G15.LCD.closeLCD()
            Log.Write("GDI+ Error in G15 renderer")
            Log.Write("G15 features disabled")
        End Try

    End Sub

    Public Sub AnimateHeartbeat()
        Static G As Graphics = Graphics.FromImage(G15HeartMonitor)
        Static BMTemp As New Bitmap(44, 17, Imaging.PixelFormat.Format32bppArgb)
        Static GTemp As Graphics = Graphics.FromImage(BMTemp)
        Dim Columns As Integer = 13 + ((PlayerActor.HPMax - PlayerActor.iHP) / PlayerActor.HPMax) * 20
        Static ColumnIndex As Integer = 0

        GTemp.DrawImage(G15HeartMonitor, New Rectangle(0, 0, 44, 17), New Rectangle(1, 0, 44, 17), GraphicsUnit.Pixel)
        G.DrawImage(BMTemp, New Rectangle(0, 0, 44, 17), New Rectangle(0, 0, 44, 17), GraphicsUnit.Pixel)

        G.DrawLine(Pens.Black, 43, 0, 43, 17)

        If ColumnIndex >= Columns Then
            ColumnIndex = 0
        End If

        G.DrawImage(G15Heartbeat, New Rectangle(43, 4, 1, 8), New Rectangle(If(PlayerActor.iHP > 0, Math.Min(ColumnIndex, 7), 7), 0, 1, 8), GraphicsUnit.Pixel)

        ColumnIndex += 1
    End Sub

    Public Sub MakeMinimap()
        Static oPos As New XYPos(0, 0)
        Dim iActorIndice As Int32 = 0

        For Y = -21 To 21
            For X = -21 To 21

                G15Minimap.SetPixel(X + 21, Y + 21, Color.Black)
                oPos.X = X + PlayerActor.PositionX
                oPos.Y = Y + PlayerActor.PositionY
                If oPos.Y < 0 OrElse oPos.X < 0 OrElse oPos.X >= iMapSize OrElse oPos.Y >= iMapSize Then
                    G15Minimap.SetPixel(X + 21, Y + 21, Color.Black)
                    Continue For
                End If
                If Main.Map.arrAccessiblityMap(oPos.AsOffset) Then
                    G15Minimap.SetPixel(X + 21, Y + 21, Color.White)
                Else
                    G15Minimap.SetPixel(X + 21, Y + 21, Color.Black)
                End If

                For iActorIndice = iActorIndice To genActors.Count - 1
                    Dim oActor As Actor = genActors(iActorIndice)
                    If oPos.Y > oActor.PositionY Then
                        Continue For
                    ElseIf oPos.Y < oActor.PositionY Then
                        Exit For
                    ElseIf oPos.Y = oActor.PositionY AndAlso oPos.X < oActor.PositionX Then
                        Exit For
                    End If
                    If oPos.X = oActor.PositionX AndAlso oPos.Y = oActor.PositionY Then
                        G15Minimap.SetPixel(X + 21, Y + 21, Color.Black)
                    End If
                Next

            Next
        Next
    End Sub
End Module

Answer 1

我首先要确保在Graphics和Bitmap对象上正确地调用.Dispose()。(我不明白所有这些“静力学”的目的-但那是另一个故事)。

Answer 2

调用GetHbitmap()之后，需要调用DeleteObject()

http://pinvoke.net/default.aspx/gdi32/DeleteObject.html