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I would like to get rid of (actually move) the arrow in the menu item which is used to show the existence of menu items to the right of the menu item. The reason for this is that I need to show the menu on the right hand side of the form and when I change the RightToLeft property, the arrow appears in the center of the menu item. I've made several different attempts but to no avail. It doesn't seem to matter whether I use owner draw or not. Can somebody help?
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There's plenty of articles here on CodeProject about owner drawing menus. Just try a search[^].
There's also a pretty basic - but complete - example on Dr. GUI .NET some time back, Controls and Icons a la .NET[^]. The example is in VB.NET, but if you truly understand the .NET Framework, you'll have no problems translating it to C# if you need that. There's also a pretty good "Cutting Edge" article in MSDN Magazine, Owner-drawing in .NET[^], which deals completely with menus.
Microsoft MVP, Visual C#
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Thanks but I still don't see from these articles what to do in order to get rid of the arrows. They are always drawn when one or more submenus are added to a menu item (to its right). These arrows appear in black while viewing the menu item and in white when selecting (hovering over) it. This occurs regardless of which colors are set in the DrawString or FillRectangle methods (in the owner draw procedure).
I put some debugging print statements into an overridden WndProc method, but I fail to see which event (in Message) would do this drawing.
I also attempted to create a graphics object in the MenuItemPopUp method but when I attempted to create such an object from the handle I received from the sender (MenuItem) the program just crashed giving me an out of memory error msg. Seems like creating a graphics object from the window handle of the form object is allowed but doing the same from the window handle of the menu is not. (Although, even if this had succeeded I have my doubts as to whether this would solve my problem).
So, if anybody out there has succeeded in getting rid of (or moving) these arrows, I would appreciate it if you could tell me.
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The MenuItem.DrawItem event gives you the the Graphics object you should be using. It's possible the out-of-memory exception is because a Graphics object has already been created from the window handle, which obtained the HDC internally. There can only exist one HDC for the drawing operation, IIRC.
I threw together a quick test and see what you mean. Unfortunately, .NET probably has nothing to do with this since it merely encapsulates the Windows APIs. You could always try adjusting the SizeF in which the text is drawn so that the menu item is long enough to display some space between the arrow and the text. I have heard that there are some quirks in right-to-left reading orders, and this appears to be one. Googling for this subject pretty much comes up with that idea - offsetting your text appropriately.
Microsoft MVP, Visual C#
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Thank you for your response and for trying this out with a test program. I increased the width of the menu item window in MeasureItem and it does look better. Unfortunately, the arrows are on the wrong side of the text and are pointing in the wrong direction. What really baffles me is that I can't find the Windows API message which probably repaints the Menu item after I paint it in DrawItem. This message ought to be one of the messages coming through the WndProc method.
By the way the out-of-memory exception I get is not in MenuItem.DrawItem but in the PopUp event method. It happens when I attempt to create a Graphics object from the window handle of the MenuItem. I wonder whether this is a bug in .NET (with C#).
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When displaying the underlying popup window for a menu, an HDC would also be used. From experience, creating an additional one causes similar problems.
When I threw together my simple - and very stupid! - application and set RightToLeft on the main form to RighToLeft.Yes (the child controls were left as the default RightToLeft.Inherit), the arrows were on the right (left, that is!  ) side and pointing the right (left) direction.
Are you trying to perform right-to-left drawing yourself without regard to the RightToLeft property?
Microsoft MVP, Visual C#
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I pretty much gave up on this whole endeavor now. Instead I am now keeping the RightToLeft as Inherit (that is NO) and instead placed a huge empty MenuItem (filled with spaces and set to Enabled = False). But what I was trying to do was to keep the labels on my menu items as Left adjusted (by using tabs in my Format.SetTabStops. But for me the arrows showed up on the left and pointed to the left and since I am using English this didn't look so great (especially when the arrows came in the middle of the labels). When I attempted this, I did set the RightToLeft value to be YES.
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Wait, you used tab-stops? The default menuing provided by Windows uses these for arrow and shortcut key placement. Set 2 or 3 tab stops (calculating in the maximum SizeF.Width from Graphics.MeasureString) and see what you come up with.
Microsoft MVP, Visual C#
My Articles
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Just for the hell of it I set up some tabs (though it turns out I just needed one). This is my code:
float[] tabs = {15};
Format.SetTabStops(0, tabs);
string MenuItmStr = "\tX\t" + Item.Text;
The X now covers the arrow though the arrow is still there. Seems like it somehow gets drawn after my DrawItem gets executed.
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I'm trying to run the GetDisplayName method of a folder (in this case, the desktop folder). It all executes perfectly as far as I can see, until it reaches the StrRetToStr method, where it crashes with a null pointer error.
I'm slightly confused as its practicaly identical to the tutorial on this site.
The code follows:
<br />
desktopPIDL = new IntPtr();<br />
<br />
COMStuff.SHGetDesktopFolder(out desktopPIDL);<br />
<br />
Type shellType = typeof(IShellFolder);<br />
<br />
IShellFolder shellFolder = (IShellFolder)<br />
Marshal.GetTypedObjectForIUnknown(thing, shellType);<br />
<br />
<br />
IntPtr interfacePtr = new IntPtr();<br />
IntPtr relativePIDL = new IntPtr();<br />
<br />
Guid myGUID = Marshal.GenerateGuidForType(shellType);<br />
<br />
result = COMStuff.SHBindToParent(pidl,<br />
myGUID,
out interfacePtr,<br />
out relativePIDL);<br />
<br />
IShellFolder myShellFolder = (IShellFolder)Marshal.GetTypedObjectForIUnknown(interfacePtr,shellType);<br />
<br />
mySTRRET = new STRRET();<br />
result = myShellFolder.GetDisplayNameOf(relativePIDL,SHGDN_Flags.SHGDN_NORMAL | SHGDN_Flags.SHGDN_FORPARSING<br />
,ref mySTRRET);<br />
<br />
<br />
myFileName = new string(' ',128);<br />
<br />
result = COMStuff.StrRetToStr(ref mySTRRET, relativePIDL, out myFileName); <br />
The calling code above gets to the last line before crashing.. STRRET has all it's values set (except type... the uint is always 0 for this struct).
The STRRET struct and the StrRetToStr method are declared as follows:
<br />
[StructLayout(LayoutKind.Explicit, CharSet = CharSet.Auto)]<br />
public struct STRRET <br />
{<br />
[FieldOffset(0)]<br />
public uint uType;
<br />
[FieldOffset(4)]<br />
public IntPtr pOleStr;
<br />
[FieldOffset(4)]<br />
public UInt32 uOffset;
<br />
[FieldOffset(4)]<br />
public IntPtr cStr;
<br />
}<br />
<br />
<br />
<br />
[DllImport("shlwapi.dll", CharSet=CharSet.Auto)]<br />
public static extern int StrRetToStr(<br />
ref STRRET pstr, <br />
IntPtr pidl,<br />
[MarshalAs(UnmanagedType.BStr)]<br />
out string pbstring);<br />
<br />
If anyone could shed some light on this subject, it would be most grateful.
regards
Cata
(This is actualy an expantion on a thread I posted 2 weeks ago, but I've been supremely busy, so it's lost in the archives somewhere)
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how would i run a command from c# like i would at the command prompt? (just an example: command="explorer /e,c:")
thanks,
Rob Tomson
--
There are 10 kinds of people. Those who understand binary and those who don't.
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Look at Process class and specifly its method Process.Start() and StartInfo property.
Mazy
You're face to face,
With the man who sold the world - David Bowie
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You can use the code below to run an application.
The arguments in this case is the application's exe as the first argument & the second argument is the actual file you want to open.
You can also just specify the file & it will open in the default application.
I'm sure it must be possible to just specify the application as well.
System.Diagnostics.Process.Start("WMPlayer.exe", "C:\\test.wmv");
Hope it helps
Jaclyn
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i was actually looking at that but since it said Diagnostics i didn't know if it was meant to be used for that or something else. what i want to do is running a third party console program silently. using the Process.Start it opens up a command prompt box for me and does exactly what i want but is there a way to not show the window?
thanks,
Rob Tomson
--
There are 10 kinds of people. Those who understand binary and those who don't.
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I've created a class which extends the ScrollableControl, now this class is basically a control which contains images, i.e. a viewer. Now my problem is is that according to the documentation 'AutoScroll' allows the user to scroll to any CONTROLS outside of the bounds. The images however which are being displayed are not controls and are a unique type, how can I activate the scroll bars anyway????
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You have to set AutoScroll to true, and AutoScrollMinSize to total size that you want to have viewable. If you're doing drawing yourself, you have to make sure to adjust positions in your OnPaint event.
best way to do that is put:
pe.Graphics.TranslateTransform (AutoScrollPosition.X, AutoScrollPosition.Y);
at the top of onPaint
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You'll have to override WndProc and handle all the scrolling messages yourself. You should also P/Invoke SendMessage so that you can send messages to the scroll bars (or the parent control, actually) to control how they track.
For more information on the common control scroll bars (since most of the controls and other classes in System.Windows.Forms encapsulate the Windows Common controls and other Windows Management APIs), see scroll bars[^] in the Platform SDK.
Microsoft MVP, Visual C#
My Articles
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Hi!
How do I rasie an Vscroll event in a richTextBox? without pressing the scrollbar (i.e. When I press a button I want it to preform the same function as when I press the scrollbar).
Regards,
GobbaTroll..
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This question has been ask before, search this forum for proper answer. I can't remember the exact answer now , but I think it could be done by using win32 SendMessage()function.
Mazy
You're face to face,
With the man who sold the world - David Bowie
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is there a way to add a checkbox to the top of a browseforfolder dialog box? i want to have an option to "process subdirectories" right on the browse dialog. (like in the winamp add directory dialog)
thanks,
Rob Tomson
--
There are 10 kinds of people. Those who understand binary and those who don't.
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Does anyone know how I can access the taskbar & see which applications are open? Ie, I need to list all open windows.
Any help will be much appreciated... 
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Through WMI classes(System.Management namespace) you can get list of running process, there are some example in this site, maybe you can some property there to get which one is visible window.
Mazy
You're face to face,
With the man who sold the world - David Bowie
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An easier way is to actually use Process.GetProcesses (rather than management classes, although that could work to get processes on a remote machine rather easily). This will get you all the running processes.
You can enumerate these and check Process.MainWindowHandle. The return value is non-zero if the process has an associated window; otherwise, zero (IntPtr.Zero actually) if it doesn't (like a console application or Windows service).
Microsoft MVP, Visual C#
My Articles
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Thank you very much for your help, I have indeed managed to get all open applications on the taskbar. But I can only get the open applications, which is great, but alas I need all open windows as well. e.g. If My Documents is open, I need it to pick that up as well, which it doesn't at the present moment. Any idea how I would go about it to get all open windows as well?
Thank you
Jaclyn 
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"My Documents" is not a process. explorer.exe (Windows Explorer) is the process that is running that displays a folder like "My Documents". For that matter, iexplore.exe could as well since Windows Explorer and Internet Explorer are both ActiveX containers. Just use Process.MainWindowTitle to get the title being displayed in the caption area of the main window frame.
Microsoft MVP, Visual C#
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