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# Direct3D in a PictureBox - C#

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Hey, I''ve got Direct3D up and running in a picture box control in C# (it was surprisingly easy and worked the first time). However, I find that when I minimize the application, I get an error: "InvalidCallException" on a line in my OnResetDevice code: public void OnResetDevice(object sender, EventArgs e) { Device dev = (Device)sender; // Turn off culling, so we see the front and back of the triangle dev.RenderState.CullMode = Cull.None; dev.RenderState.Lighting = false; << ERROR I strongly suspect that it has something to do with the fact that this event code is handled by my GraphicsWindow class instead of the main form. By that I mean that the PictureBox control itself "owns" the direct3d device: device = new Device(0, DeviceType.Hardware, window, CreateFlags.SoftwareVertexProcessing, presentParams); //Create a device device.DeviceCreated += new System.EventHandler(this.OnCreateDevice); device.DeviceReset += new System.EventHandler(this.OnResetDevice); this.OnCreateDevice(device, null); this.OnResetDevice(device, null); (in the above code "this" is a picture box control) So maybe I have to add some event to handle Resetting the device in my main form? Or insert a stub event that calls the event in the GraphicsWindow? Thanks for any help! ---------------------------------------- Let be be finale of seem, seems to me. ---------------------------------------- Coding: http://www.stanford.edu/~jjshed/coding Miscellany: http://www.stanford.edu/~jjshed

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Yes, you are right. There is a difference when handling forms and custom controls like picture box. I think all you have to do is hook on DeviceResizing event:
device.DeviceResizing += new System.CancelEventHandler(this.DeviceResizingEventHandler);

And in DeviceResizingEventHandler return true when your application is minimized...

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That seems promising. I''m just starting with C# and DirectX, do you think you could give a little bit more detail? In specific, I don''t understand two things:

1. What do you mean by "return true" if the window is minimized? The DeviceResizing event handler delegate seems to have a void return type.

2. How can I find out if the window is minimized or not? I used to know how to do it in Visual Basic, but it''s been forever since I''ve had to do something like test if a window is open.

Thanks! I would have taken me forevAr to figure out to hook the DeviceResize event on my own (I don''t have a very good understanding of device events).

----------------------------------------
Let be be finale of seem, seems to me.
----------------------------------------

Coding:
http://www.stanford.edu/~jjshed/coding

Miscellany:
http://www.stanford.edu/~jjshed

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As evidence that I am not a complete idiot, I have figured out 90% of the solution:

public void DeviceResizingEventHandler(object sender, System.ComponentModel.CancelEventArgs e)
{
Device dev = (Device)sender;

if(dev.CheckCooperativeLevel())
{
e.Cancel = true;
return;
}

if(((Form)window.Parent).WindowState == System.Windows.Forms.FormWindowState.Minimized)
{
e.Cancel = true;
return;
}
}

However, it also seems that I might want to cancel the event if the Form holding my PictureBox is not active. Is this true? If so, how can I determine if a form is active or not?

Thanks!

----------------------------------------
Let be be finale of seem, seems to me.
----------------------------------------

Coding:
http://www.stanford.edu/~jjshed/coding

Miscellany:
http://www.stanford.edu/~jjshed

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Maybe (((Form)window.Parent).Focused ? But, after you lose focus, you dont need reset anyway, so I dont see a point in canceling reset on that event. But, if you don`t want to render when your applications is out of focus (not active), render only when your app has focus, like:
if( ((Form)window.Parent)).Focused )
{
Render();
...
}

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Hey, it seemed like I had that resizing thing all sorted out by adding the CancelEventHandler to the resize message. However, I have recently discovered that I now have a new problem:

Since I''m canceling the resize event for the device, whenever I change the size (increasing it) of the PictureBox that I''m using DirectX to visualize through, I can tell that the resolution on the window is not getting larger. DirectX still draws in the entire control, but if the control''s initial size was 100,100 and I resize my window to make it very large (like 500,500), DirectX merely scales up the 100,100 to make a 500,500 image with blocky 5x5 pixels. This is just a mess - how can I fix it?

PS - What''s the deal with managing these OnDeviceLost messages anyways? Can''t DirectX keep track of it''s stuff and make sure it doesn''t get lost? OpenGL doesn''t have this problem.

----------------------------------------
Let be be finale of seem, seems to me.
----------------------------------------

Coding:
http://www.stanford.edu/~jjshed/coding

Miscellany:
http://www.stanford.edu/~jjshed

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*Bump* Sorry, I''m really stumped.

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