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How to set background Image of treeview in C#?
I try to code about this problem for long time , but i can't found anyway for set background of treeview in C#.
Anyboby help me , please !!! 
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If I rememebr correctly, the TreeView control doesn't support a background image, nor does it support a transparent background. You'd have to draw the control yourself to get an image to show through it or behind the actual tree that is drawn. I can't seem to find any examples of it, but you might want to look into overriding WndProc.
RageInTheMachine9532
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This could be very ugly, if even possible. The Tree-View common control that the TreeView class encapsulates doesn't even support this. The poster's best bet is handling the WM_ERASEBKGND but I'd be willing to bet this wouldn't work.
Microsoft MVP, Visual C#
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I'm with you on this, but I can't spend a week researching one small feature of his project...
RageInTheMachine9532
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hello , could anybody help me pls i'm trying to convert a 2d image of a terrain using opengl and C# into a 3d terain
thanks
MTSHEDID
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It depends on what kind of 2d terrain you have. If your terrain is a bump map, like what you see on a globe, where different colors or intensities correspond to different heights, then all you have to do is set for each pixel in your 2d terrain a pixel of the same height in your 3d model. So for every point (x,y) in 2d, there would be a point in 3d (x,y,z=(intensity of(x,y))/(maxintensity-lowestintensity)*scale), where your scale is something you define. However you would have to define how to connect these points in 3d using GL.Polygons, GL.Triangles, etc. Your normals would be the cross product of dx and dy. If intense2d(x,y) corresponds to the color or intensity in your 2d terrain, depending on how its defined in your terrain map. Your basic code would be:
<br />
float maxint = maximum intensity in your 2d terrain.<br />
float minint = minimum intensity in your 2d terrain.<br />
float scale = maximum altitude/maximum intensity in 2d terrain.<br />
float zscale = scale*(maxint-minint)<br />
for each x and y in 2d image <br />
float dx= intense2d(x+1,y)-intense2d(x,y), dy=intense2d(x,y+1)-intense2d(x,y);<br />
Vector norm = cross(new Vector(1,0,dx), new Vector(0,1,dy)); <br />
Gl.glNormal3f ( (float)norm.x, (float)norm.y, (float)norm.z );<br />
Gl.glVertex3f ( (float)x, (float)y, (float)intense2d(x,y)/(zscale));
If you are putting this terrain onto an object, then you might not neccesarily want to set the height, but just the normals at their corresponding location, which is bump-mapping.
This is the basic idea, otherwise you would have to be more specific.
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thank u very much i'll try it out right away
MTSHEDID
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I've developed a Power Point add in which works well enough right now (except it doesn't interact with PowerPoint (other than the button on the toolbar) yet. 
Essentially it automates some background processes for the creation of some multimedia.
In any case I've found it very difficult to find good articles and/or code examples out there for actually manipulating powerpoint itself (or any other office app for that matter).
Perhaps I've been entering the wrong search criteria...I don't know. In any case the C# Code Project community has been VERY helpful in the past, so I just wanted to ping your # minds for some reference materials be they web sites or books.
I *have* found several books out there but have not yet had a chance to look any of them over. So any recommendations would be great.
--Tony Archer
"I can build it good, fast and cheap. Pick any two."
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Ok, haven't read them yet but just noticed there are quite a few articles listed under Add-In's on the main page.
PS to webmaster (the search functionality could stand a tweak I think)
--Tony Archer
"I can build it good, fast and cheap. Pick any two."
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So my original question remains. All the articles I saw were for vb add-ins.
--Tony Archer
"I can build it good, fast and cheap. Pick any two."
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So? Don't you realize that VB uses automation, which is what the interop assemblies you'd use does? It's the same thing. The object model documented for any automation client like VB is the same which you'd use in .NET. If you're talking about VB.NET, then you don't seem to understand that different languages that target the CLR are only different syntaxes (some compilers support different levels of the CLI/CLR, however). All the languages compile down to Microsoft Intermediate Languages (MSIL), which is why the .NET Framework allows for so many languages.
For a true .NET developer, translating between VB.NET and C# should be no problem. If you're talking about VB6, then again I remind you that the automation object model exposed to clients like VB6 is the same that comprises the interop assemblies I mentioned in previous replies to your posts.
Microsoft MVP, Visual C#
My Articles
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Oops, no I typed the wrong letter. I am well aware that they all compile to the same thing and use the same object structure. I meant VS as in Visual Studio Add-Ins. I am interested in Office Add-Ins. Specifically Power Point. I cannot seem to find many docs on automation of powerpoint (or office in general) from .NET
I already wrote an the add-in, so now there is an extra button on the toolbar when I run Power Point. The button when clicked opens a custom form but I am having trouble finding documentation on how to interact with Power Point from that form.
Specifically,
- How do I get a reference to the power point application so I can set my form's .owner property (or .parant)?
- How can I programatically make power point go into full screen mode?
- How can I read/set notes for specific slides in the current .ppt file?
--Tony Archer
"I can build it good, fast and cheap. Pick any two."
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The best object model documentation is actually in the programming help that is not installed by default (with a typical installation) of Office. Re-run set and choose the programming help files. MSDN Online doesn't have much for some reason. When your control is created, the context in which it's created is the ApplicationClass as it's known in the interop assembly for PowerPoint (one word, BTW). The add-in object model should already expose a way to get the running instance, such as an Application property. This is very common throughout the object model.
Microsoft MVP, Visual C#
My Articles
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I don't get it. I am trying to download from a series of webpages using a call to HttpWebResponse.BeginGetResponse. This is set up in a for loop, all calls are made in the main thread and I keep getting the following NullReference Exceptiion in system.dll:
> system.dll System.Net.Sockets.OverlappedAsyncResult.CompletionPortCallback(uint errorCode = 64, uint numBytes = 0, System.Threading.NativeOverlapped* nativeOverlapped = 1712424) + 0xa0 bytes
If its not this then its a Unable to read from transport error.
Can anybody help?
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After how many requests do you start getting NullReferenceExceptions? Just getting responses async without any checks is dangerous. There may be a limit and there are warnings about this in the .NET Framework SDK documentation.
Microsoft MVP, Visual C#
My Articles
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Well after about 20 hours of trying every possible combination, I found out a way around this. All my requests/responses are in the main thread and I close the HttpWebResponse and the response stream as soon as I get them and I am fine. I managed to first make an initial request which gives a webpage with about 50 links. I make the 50 requests/responses on these links and this works fine. I thought I was good until I tried to repeat the process and it gives me this exception. I dont' get it since I close all the streams and all the async calls return fine. All my HttpWebResponse/Request objects are local variables in a function so they are never reused. When looking at the threads when this exception is thrown I notice that there are two threads that are blocked waiting to read the response stream, ie.
private void ProcessResponse(System.IAsyncResult state){<br />
HttpWebResponse linkpage=(HttpWebResponse)((HttpWebRequest)state.AsyncState ).EndGetResponse(state);<br />
StreamReader stream = new StreamReader(response.GetResponseStream());<br />
string info = stream.ReadtoEnd();
stream.Close()<br />
response.Close();
You said that getting them without checks is dangerous. What do you mean by a check?
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Well, I see one problem: what if the file is not simply a text file? It will not have an EOF (end of file) so StreamReader.ReadToEnd will never return. Even streams that may appear as text may not be, and may not have an EOF. Just use a Stream and buffer the output (you don't have to do anything with it, like you're not doing for string info).
What I mean is that creating threads wildly like this - without limiting how many threads are created - is dangerous. You should either have some mechanism that counts the number of async requests and blocks at a certain limit. An even better way is to not using async calls but to instead use a ThreadPool and queue requests synchronously (the end result is still asynchronous). The ThreadPool limits the number of concurrent worker items (threads) and queues the rest. It also has a few additional benefits you can learn by reading about the ThreadPool class in the .NET Framework SDK documentation.
Microsoft MVP, Visual C#
My Articles
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Hello,
I am drawing the tab control myself and here is the problem:
In the app the user is allowed to change the tab name. However, if the string he/she enters is too long, not all of it is displayed on the tab label. Here is the code I am using:
<br />
private void buttonsTab_DrawItem(object sender, System.Windows.Forms.DrawItemEventArgs e)<br />
{<br />
Font f;<br />
Brush foreBrush;<br />
<br />
f = new Font(e.Font, FontStyle.Italic | FontStyle.Bold);<br />
foreBrush = Brushes.Black;<br />
<br />
string tabName = this.buttonsTab.TabPages[e.Index].Text;<br />
StringFormat sf = new StringFormat();<br />
sf.Alignment = StringAlignment.Center;<br />
Rectangle r = e.Bounds;<br />
r = new Rectangle(r.X, r.Y + 3, r.Width, (int)f.GetHeight() + 2);<br />
e.Graphics.DrawString(tabName, f, foreBrush, r, sf);<br />
}<br />
I set the height of the rectangle I use in DrawString to the font height. I dont want the string to wrap and start on a new line.
Is there anyway that I can ensure that the entire string is displayed at once?
Is my only option to limit how long the new name that the user enters can be?
Thanx for the help 
-Flack
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StringFormat allows various ways of clipping your string. Dig around there 
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I looked at StringFormat but it didn't solve the problem. I could clip the string but I would rather the tab label width increase to allow for the whole string.
When I let the tab control draw itself, the tab label width is automatically set to an approproate width so that it can contain the entire label.
Is there any way for me to change the tab label size myself?
I use e.Bounds from the System.Windows.Forms.DrawItemEventArgs arg to the DrawItem function but for some reason the width is not large enough.
Does anyone have an idea as to how the tab control draws itself to allow for the whole string to be seen so that I can use similar code in my DrawItem method?
Any suggestions?
-Flack
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The TabControl encapsulates the Tab common control, so you can P/Invoke SendMessage to send the TCM_SETITEMSIZE (0x1329) to the control (use its Handle property, which is the HWND for the control).
Microsoft MVP, Visual C#
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I would like to override the default .NET OpenFileDialog to add a text box and label, and then be able to retrieve the entered value via the properties of the overriden dialog.
Is this even possible, if so can anybody point me in the direction of any docs that could help me achieve this effect.
post.mode = postmodes.signature;
SELECT everything FROM everywhere WHERE something = something_else;
> 1 Row Returned
> 42
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Inheriate from the OpenFileDialog, and alter the visuall aperance of the windows by resizing the window and adding your controls.
Q:What does the derived class in C# tell to it's parent?
A:All your base are belong to us!
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Yeah - that doesn't work. OpenFileDialog uses the OPENFILENAME struct (documented in the Platform SDK). This can accept a dialog template as a field (requires a mask). Extending this simply won't work. Any experience with native Win32 programming would tell you that, as well as knowing that most everything Windows Forms merely encapsulates native functionality, like the GetOpenFileName API that the OpenFileDialog uses. See the IL using ildasm.exe for that class and you'll see.
Microsoft MVP, Visual C#
My Articles
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Forget what he told you - it won't work. The OpenFileDialog class uses the GetOpenFileName native API, which uses a OPENFILENAME struct. This can accept a dialog template, but this is a native resource and not reproducable (not without direct memory manipulation, which would require an unsafe context and experience with dialog templates) using purely managed code.
I recommend using a mixed-mode Managed C++ assembly in order to create the dialog template using the visual designer (not a Windows form - an "old school" dialog).
Microsoft MVP, Visual C#
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