https://ni.lithium.com/t5/Measurement-Studio-for-NET/CWGraph-Problems-in-VB-Net/m-p/33862#M2 I might be wrong, but I think component works uses<BR />the mfc42.dll and vb.net uses mfc70.dll<BR /><BR /><BR />Curt <BR /> Wed, 30 Jan 2002 23:05:38 GMT Curt_C 2002-01-30T23:05:38Z https://ni.lithium.com/t5/Measurement-Studio-for-NET/CWGraph-Problems-in-VB-Net/m-p/33861#M1 We are trying Measurement Studio with VB.Net. It seems to work fine except for 1 condition we have found.<BR /><BR />The CWGraph works well until you leave it alone for a few minutes. Then it seems that part of the object gets corrupted. It almost appears that part of the control is getting overwritten. The time span might indicate that the garbage collector is involved. <BR /><BR />When I look at the problem in the debugger it states <BR /><BR />"error: cannot obtain value" <BR /><BR />and the .Net error handling states:<BR /><BR />System.Reflection.TargetException: Object does not match target type<BR /><BR />Anybody hear of anything like this?<BR /><BR />Here is what the CWGraph control looks like when it is corrupted:<BR /><BR />- AxCWGraph1 {AxCWUIControlsLib.AxCWGraph} AxCWUIControlsLib.AxCWGraph<BR />+ System.Windows.Forms.AxHost {AxCWUIControlsLib.AxCWGraph} System.Windows.Forms.AxHost<BR />+ ocx {System.__ComObject} CWUIControlsLib._DCWGraph<BR />+ eventMulticaster {AxCWUIControlsLib.AxCWGraphEventMulticaster} AxCWUIControlsLib.AxCWGraphEventMulticaster<BR />+ cookie {System.Windows.Forms.AxHost.ConnectionPointCookie} System.Windows.Forms.AxHost.ConnectionPointCookie<BR /> CWBindingStatusUpdated Nothing AxCWUIControlsLib._DCWGraphEvents_CWBindingStatusUpdatedEventHandler<BR /> CWBindingDataUpdated Nothing AxCWUIControlsLib._DCWGraphEvents_CWBindingDataUpdatedEventHandler<BR /> ReadyStateChange Nothing System.EventHandler<BR /> AnnotationMouseDown Nothing AxCWUIControlsLib._DCWGraphEvents_AnnotationMouseDownEventHandler<BR /> AnnotationMouseUp Nothing AxCWUIControlsLib._DCWGraphEvents_AnnotationMouseUpEventHandler<BR /> AnnotationMouseMove Nothing AxCWUIControlsLib._DCWGraphEvents_AnnotationMouseMoveEventHandler<BR /> AnnotationChange Nothing AxCWUIControlsLib._DCWGraphEvents_AnnotationChangeEventHandler<BR /> PlotAreaMouseUp Nothing AxCWUIControlsLib._DCWGraphEvents_PlotAreaMouseUpEventHandler<BR />+ PlotAreaMouseMove {AxCWUIControlsLib._DCWGraphEvents_PlotAreaMouseMoveEventHandler} AxCWUIControlsLib._DCWGraphEvents_PlotAreaMouseMoveEventHandler<BR /> PlotAreaMouseDown Nothing AxCWUIControlsLib._DCWGraphEvents_PlotAreaMouseDownEventHandler<BR /> PlotMouseUp Nothing AxCWUIControlsLib._DCWGraphEvents_PlotMouseUpEventHandler<BR /> PlotMouseMove Nothing AxCWUIControlsLib._DCWGraphEvents_PlotMouseMoveEventHandler<BR /> PlotMouseDown Nothing AxCWUIControlsLib._DCWGraphEvents_PlotMouseDownEventHandler<BR /> CursorMouseDown Nothing AxCWUIControlsLib._DCWGraphEvents_CursorMouseDownEventHandler<BR /> CursorMouseUp Nothing AxCWUIControlsLib._DCWGraphEvents_CursorMouseUpEventHandler<BR /> CursorMouseMove Nothing AxCWUIControlsLib._DCWGraphEvents_CursorMouseMoveEventHandler<BR />+ CursorChange {AxCWUIControlsLib._DCWGraphEvents_CursorChangeEventHandler} AxCWUIControlsLib._DCWGraphEvents_CursorChangeEventHandler<BR /> KeyUpEvent Nothing AxCWUIControlsLib._DCWGraphEvents_KeyUpEventHandler<BR /> KeyPressEvent Nothing AxCWUIControlsLib._DCWGraphEvents_KeyPressEventHandler<BR /> KeyDownEvent Nothing AxCWUIControlsLib._DCWGraphEvents_KeyDownEventHandler<BR />+ MouseDownEvent {AxCWUIControlsLib._DCWGraphEvents_MouseDownEventHandler} AxCWUIControlsLib._DCWGraphEvents_MouseDownEventHandler<BR />+ MouseUpEvent {AxCWUIControlsLib._DCWGraphEvents_MouseUpEventHandler} AxCWUIControlsLib._DCWGraphEvents_MouseUpEventHandler<BR />+ MouseMoveEvent {AxCWUIControlsLib._DCWGraphEvents_MouseMoveEventHandler} AxCWUIControlsLib._DCWGraphEvents_MouseMoveEventHandler<BR /> DblClick Nothing System.EventHandler<BR />+ ClickEvent {System.EventHandler} System.EventHandler<BR /> Enabled error: cannot obtain value Boolean<BR /> PlotAreaColor error: cannot obtain value System.Drawing.Color<BR /> PlotAreaImage error: cannot obtain value CWUIControlsLib.CWPictureDisp<BR /> TrackMode error: cannot obtain value CWUIControlsLib.CWGraphTrackModes<BR /> Font error: cannot obtain value System.Drawing.Font<BR /> PlotTemplate error: cannot obtain value CWUIControlsLib.CWPlot<BR /> ChartStyle error: cannot obtain value CWUIControlsLib.CWChartStyles<BR /> ChartLength error: cannot obtain value Integer<BR /> GraphFrameImage error: cannot obtain value CWUIControlsLib.CWPictureDisp<BR /> GraphFrameColor error: cannot obtain value System.Drawing.Color<BR /> ImmediateUpdates error: cannot obtain value Boolean<BR /> Caption error: cannot obtain value String<BR /> BackColor error: cannot obtain value System.Drawing.Color<BR /> ReadyState error: cannot obtain value Integer<BR /> Windowless error: cannot obtain value Boolean<BR /> CaptionColor error: cannot obtain value System.Drawing.Color<BR /> KeyboardMode error: cannot obtain value CWUIControlsLib.CWKeyboardModes<BR /> DefaultxInc error: cannot obtain value Double<BR /> DefaultxFirst error: cannot obtain value Double<BR /> DefaultPlotPerRow error: cannot obtain value Boolean<BR /> YDataAppend error: cannot obtain value Object<BR /> XYDataAppend error: cannot obtain value Object<BR /> YData error: cannot obtain value Object<BR /> XYData error: cannot obtain value Object<BR /> GraphFrameStyle error: cannot obtain value CWUIControlsLib.CWGraphFrameStyles<BR /> AnnotationTemplate error: cannot obtain value CWUIControlsLib.CWAnnotation<BR /> Plots error: cannot obtain value CWUIControlsLib.CWPlots<BR /> Axes error: cannot obtain value CWUIControlsLib.CWAxes<BR /> Cursors error: cannot obtain value CWUIControlsLib.CWCursors<BR /> CWBindings error: cannot obtain value CWUIControlsLib.CWBindings<BR /> Annotations error: cannot obtain value CWUIControlsLib.CWAnnotations<BR /> TraceType Actual Agilent.LWD.Ag86038x.UserInterface.ucODAGraph.TraceType<BR /> Wed, 30 Jan 2002 18:51:03 GMT https://ni.lithium.com/t5/Measurement-Studio-for-NET/CWGraph-Problems-in-VB-Net/m-p/33861#M1 Roadkill 2002-01-30T18:51:03Z https://ni.lithium.com/t5/Measurement-Studio-for-NET/CWGraph-Problems-in-VB-Net/m-p/33862#M2 I might be wrong, but I think component works uses<BR />the mfc42.dll and vb.net uses mfc70.dll<BR /><BR /><BR />Curt <BR /> Wed, 30 Jan 2002 23:05:38 GMT https://ni.lithium.com/t5/Measurement-Studio-for-NET/CWGraph-Problems-in-VB-Net/m-p/33862#M2 Curt_C 2002-01-30T23:05:38Z https://ni.lithium.com/t5/Measurement-Studio-for-NET/CWGraph-Problems-in-VB-Net/m-p/33863#M3 Therefore, your surmising that the CWGraph is incompatible with VB.Net. <BR /><BR />Correct? <BR /><BR />Has National Instruments released any information with regard to VB.Net? <BR /> Thu, 31 Jan 2002 00:50:05 GMT https://ni.lithium.com/t5/Measurement-Studio-for-NET/CWGraph-Problems-in-VB-Net/m-p/33863#M3 Roadkill 2002-01-31T00:50:05Z https://ni.lithium.com/t5/Measurement-Studio-for-NET/CWGraph-Problems-in-VB-Net/m-p/33864#M4 The graph control does use mfc42.dll, but there is no relationship between VB.NET and mfc70.dll.<BR /><BR />Could you please provide more information about what you're doing in your application? For example, is the graph left alone for a few minutes or is data periodically getting charted/plotted to the graph? Are you handling any of the graph's events? Are you using bindings, and if so, what properties are you binding to? What other settings have you set on the graph? Can you reproduce this in a smaller application and if so, what are the minimum steps that it takes to create a project that reproduces this problem?<BR /><BR />- Elton <BR /> Thu, 31 Jan 2002 04:50:26 GMT https://ni.lithium.com/t5/Measurement-Studio-for-NET/CWGraph-Problems-in-VB-Net/m-p/33864#M4 Elton Wells 2002-01-31T04:50:26Z https://ni.lithium.com/t5/Measurement-Studio-for-NET/CWGraph-Problems-in-VB-Net/m-p/33865#M5 Found the problem. <BR /><BR />It was a problem on how we were implementing threads and event handling in VB.Net(use invoke instead of raise event!). CWgraph is working perfectly now.<BR /><BR />Thanks. <BR /> Fri, 01 Feb 2002 17:48:19 GMT https://ni.lithium.com/t5/Measurement-Studio-for-NET/CWGraph-Problems-in-VB-Net/m-p/33865#M5 Roadkill 2002-02-01T17:48:19Z