Question

我正在编写一个应用程序，它在Logitech G15v2键盘的LCD上绘制图像。在大多数情况下，该函数运行正常，但运行一段时间后，其中一行会抛出“Generic Error in GDI+”

根据堆栈跟踪，问题出在Bitmap.GetHbitmap()：

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"

我已经阅读了几个提到此错误的主题，但这是在保存文件的上下文中，而不是获取其关联的HBitmap。有没有比我更多GDI +经验的人能够提出任何想法导致这个问题吗？

为了更好地参考，这里是完整的代码模块：

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对象上正确调用.Dispose（）。（我不明白所有那些静力学的目的 - 但这是另一个故事）。

Answer 2

致电GetHbitmap()后，您需要致电DeleteObject()

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

调用Bitmap.getHBitmap（）时GDI +中的一般错误

2 个答案: