typecasting the AxControl-Value in Delphi - Diagramming Components

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typecasting the AxControl-Value in Delphi (Read 5656 times)

Mischa YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 8 Joined: Feb 13^th, 2008	typecasting the AxControl-Value in Delphi Mar 13^th, 2008 at 5:44pm	Print Post
	Hello, I want to implement a flowchart-control in a box-item to show sub-graphs. My Problem is that the Value returned by the AXControl-property is not typecastable to tflowchart! My Code: box.Style :=bsAxControl; box.AxControlId:='MindFusion.FlowChartPro.4.1'; newFC:= box.AxControl as tflowchart ; or newFC:= tflowchart (box.AxControl ); or newFC:= tflowchart (idispatch(box.AxControl)); or newFC:= tflowchart (IUnknown(box.AxControl)); using a Variant works, but I need a tflowchart -variable! Help me Please! Mischa


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: typecasting the AxControl-Value in Delphi Reply #1 - Mar 13^th, 2008 at 8:04pm	Print Post
	I will have to install Delphi to try that. Does the Turbo Delphi for Win32 edition come with ActiveX support? Stoyan


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Mischa YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 8 Joined: Feb 13^th, 2008	Re: typecasting the AxControl-Value in Delphi Reply #2 - Mar 14^th, 2008 at 9:55am	Print Post
	no it does not support third-party-components!!! ???


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: typecasting the AxControl-Value in Delphi Reply #3 - Mar 14^th, 2008 at 10:15am	Print Post
	It is a pity. Well then, I am installing their RAD Studio trial version. Stoyan


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: typecasting the AxControl-Value in Delphi Reply #4 - Mar 14^th, 2008 at 12:40pm	Print Post
	This works fine: Code procedure TForm1.Button1Click(Sender: TObject); var b: box; fc: IFlowChart; begin b := FlowChart1.CreateBox(10, 10, 100, 100); b.Style :=bsAxControl; b.AxControlId:='MindFusion.FlowChartPro.4.1'; fc := b.AxRawPtr as IFlowChart; fc.CreateBox(10, 10, 30, 30); end; Typecasting does not work, because the flowchart's COM object is not an instance of the TFlowChart class. TFlowChart derives from the TOleControl and TWinControl classes, which in addition to wrapping a COM pointer, also provide various other members used to integrate a control into a VCL form. From what I can grasp from the code generated by Delphi, it seems that TFlowChart just implements the IFlowChart API, and the members you would call through TFlowChart are exactly the same as the ones you get through IFlowChart. I hope that helps, Stoyan


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Mischa YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 8 Joined: Feb 13^th, 2008	Re: typecasting the AxControl-Value in Delphi Reply #5 - Mar 14^th, 2008 at 1:49pm	Print Post
	You are so fast!!! Only FlowchartX is faster then you It helps a little bit: IFlowchart does not contain a member named Width IFlowchart does not contain a member named height IFlowchart does not contain a member named free IFlowchart does not contain a member named create IFlowchart does not contain a member named ONboxclicked, On Arrowclicked and every else event IFlowchart does not contain a member named Parent IFlowchart does not contain a member named ParentWindow IFlowchart does not contain a member named Align is it possible to get the Tflowchart-Variable???


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: typecasting the AxControl-Value in Delphi Reply #6 - Mar 14^th, 2008 at 2:11pm	Print Post
	8) Width, Height, Parent, Align etc. have sense only when a TFlowChart is a child of a VCL form or control. Now that the flowchart is inside a box, you can control its size and location by means of the respective Box methods. I will check how you can attach events to the hosted flowchart. Stoyan


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: typecasting the AxControl-Value in Delphi Reply #7 - Mar 18^th, 2008 at 3:52pm	Print Post
	From what I read in the Delphi help, importing using the "import type library" command should create a TOleServer-derived class that wraps the events and methods of any COM object. Then you could use the TOleServer.Connect method to connect the Delphi object to the COM object interface pointer (the hosted flowchart in our instance). However I cannot make Delphi generate a TOleServer wrapper for the IFlowchart interface - the result is always a TOleControl-derived class. Do you know of any tool or option of the Delphi IDE that will let you import an ActiveX control as a TOleServer? Another option is to copy the TFlowChart code to another class, rename it to TFlowChartWrapper, and modify it so that it derives from TOleServer and not from TOleControl. Then the TFlowChartWrapper should let you connect to the hosted flowchart and handle its events. Stoyan


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