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Thanks for the answer, but it won't work.
I know that in the palette the last index is the transparency color, whatever the actual color. It is usually magenta, but it could be something else. And if it is Magenta, but the first color is also magenta, then only some pixels (last index) must be transparent, the other one (first index) must remain magenta.
That's why I'd like to get the actual index, and not only the color
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I've found a solution to one of my problem.
Bitmap.Palette return a copy of the palette.
So I need to do
ColroPalette palette = bmp.Palette;
palette.Entries[0] = Color.FromArgb(150,255,255,255);
bmp.Palette = palette;
And then it works, even for the alphablending, and the picture is 8bpp indexed, it doesn't need to the 32-bit color.
However, your solution to get the index of a pixel will not work, as I can have several indexes in the palette with the same color, but they must be processed differently.
For instance, the last index is the background color and must be 100% transparent. But if it is magenta, and the 76th index is also magenta, then only the background must become transparent, and the 76th inndex must remain magenta
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Sorry, but in most cases it will work. Palettes don't usually contain the same color more than once. Sure, I suppose they could - but it's atypical. All the graphics programs I've worked with - and quite a bit - like Photoshop (last 4 versions), GiMP, and a handful of lesser-known programs consolidate the palette for space and because it's usually pointless to have more of the same color in a palette. So, just because it doesn't work for your atypical example, don't say it doesn't work.
Microsoft MVP, Visual C#
My Articles
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Sorry if I was a bit offensive. Your solution works, but not in my particular case, because it is quite likely that the palette contains several identical colors, and there should be used as different color by the software.
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Hi!
I'm looking for a method which i can use to eject my DVD-drive. If C# doesn't provide this functionality, maybe someone knows an API-call.
THX
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There is a sample code in C++ in MSDN,youu can use thos API,search this topic in MSDN:
HOWTO: Ejecting Removable Media in Windows NT/Windows 2000
Mazy
"A bank is a place that will lend you money if you can prove that you don't need it." - Bob Hope
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Hi,
My first post here...
DrCOM Monitor tool
http://www.ddevel.com/DrCOM/DrCOMMonitor.asp
I found this somewhat useful.
Let me tell you what I'm strugling now.
I'm a system trader. I currently connect my C# application to a broker trading application which has API. However, since I found another good broker/trading platform, I'm considering to switch for it. The problem is this trading application of the broker does not have API.
The target software is 100% COM based. All of the component is accessible. The whole software part is built on COM servers/dll.
At first, I tried to study the COM classes which I can browse in VS.net2003 object browser, but it's way too complicated and needs a security key in proccess, so I gave up to build from zero. Instead, I had changed the approach to hooking COM while the existing target software is working normally.
I found DrCOM and ran the target software, then I could 'INVOKE' a command such as Object.SendLogout(). The software actually had logged out from the server, and that is controled by the external tool. Wonderful, I felt.
However, I still cannot figure out the detail between COM and the target application.
DrCOM shows which Object/Class responses, but does not show which Ojbect/Class-method is called from the target app.
Plus, I don't know how to build C# app invoking the object command/picking the object event.
I have read these 2 extraordinary articles expecting they would help me
http://www.codeproject.com/system/hooksys.asp
http://www.codeproject.com/com/automatingwindowsapps.asp
however, the both are on Win32 API and a little different from what I need.
Well, I've been doing this for 2 weeks straight, but almost give up.
Anyone can suggest me a better tool than DrCOM, or how I can create such invoking capability by C#, or any good resources?
Thank you very much. Any comments are wecome 
Ken
PS. I tried TracePlus software already.
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Thank you Mazy,
This is still tweaking some Win32 level, I still don't know how to interact to COM.
Oh well, I may be going to wait thier API reliease.
Ken
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kenokabe wrote:
I still don't know how to interact to COM
To use COM dll in your class,write click you reference and select COM tab and select your dll fromm it,it create a wrapper for you to use you dll in .net.
Mazy
"A bank is a place that will lend you money if you can prove that you don't need it." - Bob Hope
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Yes, I understand that.
WhatI'm wondering is how to interact to COM in the working thread not as a new instance.
Maybe I could find something in articles you shown me here.
Best,
Ken
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Hello!
I have a problem with the DataGrid Control in C#.
I've a form with some textboxes on it. In these textboxes you can search for Data.
If you enter something in a Textbox and press the Search-Button then I build a dynamic SQL-Statement like "Select * from Company where CompanyName like "%Test%"".
With this Select Statement I fill my Dataset.
If the DataSet returns 1 Row then the Row is Displayed in the Textboxes.
If more than 1 Row is found then I open a new form and pass him the DataSet build with the SQl-Statement.
In this new form (form2) I Bind the DataGrid to the Datatable and the Data is displayed well.
In form2 the user can select one DataRow and return to form1 where the selected row is displayed. Therefore form2 returns the index of the row in the Datatable in the Dataset.
Everything works fine until you use the sort possibility in the Datagrid.
After that the DataTable and the DataGrid are not longer synchronus.
I've searched the web and found something about the CurrencyManager and tried with it but without success.
The CurrencyManager.Position only shows the same position that is selected in the Datagrid not in the Position of the DataRow in the DataTable.
Here some of my code:
form1:
frmDisplaySearch frmDisplaySearch_ = new frmDisplaySearch(dsDB,DataTableName);
DialogResult dr_ = frmDisplaySearch_.ShowDialog();
if(dr_.Equals(DialogResult.OK))
{
Console.WriteLine("Ausgewählter Datensatz " + frmDisplaySearch_.SelectedRow);
NoRowSelected = frmDisplaySearch_.SelectedRow;
RowSelected = true;
}
from2:
public frmDisplaySearch(DataSet DataSetIn_,string DataTableNameIn_)
{
InitializeComponent();
DataTableName_ = DataTableNameIn_;
DataSetToDisplay_ = DataSetIn_;
grid.SetDataBinding(DataSetToDisplay_, DataTableName_);
cm_ = (CurrencyManager)this.BindingContext[DataSetToDisplay_,DataTableName_];
this.Text = DataTableName_;
this.grid.Size = new System.Drawing.Size(MaxGridWidth, MaxGridHeight);
AutoSizeCol();
}
private void btnOk_Click(object sender, System.EventArgs e)
{
Console.WriteLine("Ausgewählter Datensatz " + grid.CurrentCell.RowNumber);
Console.WriteLine("Ausgewählter Datensatz cm_" + cm_.Position);
SelectedRow = cm_.Position;
this.DialogResult = DialogResult.OK;
this.Close();
}
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Has no one a hint for me???
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Hallo,
as a workaround, try to get the primary key of the selected row and use it to display the right row in form1.
private void btnOk_Click(object sender, System.EventArgs e)
{
(BindingManagerBase) manager = grid.BindingContext;
(DataRow) row = manager.Current;
string/int id = row[PKColumnName];
this.DialogResult = DialogResult.OK;
this.Close();
}
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Hi guys,
is it anyhow possible to change the backcolor of a specific subitem in a listview? Or is it only possible to change the color of the whole item with ListViewItem.BackColor?
Likely it won't work without deriving from ListView... 
Regards, mYkel
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This Codeproject article, http://www.codeproject.com/listctrl/selectentirerow.asp?target=LVS%5FOWNERDRAWFIXED[^], shows some of what you need, but it's in C++/MFC, not C#!
Basically you need to add the LVS_OWNERDRAWFIXED style to your derived ListView, and handle the <a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/commctls/comboboxes/comboboxreference/comboboxmessages/wm_drawitem.asp" target="_blank">WM_DRAWITEM</a> windows message and the corresponding DRAWITEMSTRUCT, which contains the iItemID of the item to draw.
You can add the style to by overriding the ListView's CreateParams property and intercept the WM_DRAWITEM in your overriden DefWndProc. The MSDN says this about LVS_OWNERDRAWFIXED:
"The owner window can paint items in report view. The list-view control sends a WM_DRAWITEM message to paint each item; it does not send separate messages for each subitem. The iItemData member of the DRAWITEMSTRUCT structure contains the item data for the specified list-view item. "
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I have this HTML code, which enables me to log me in to my internet account manager. I want to code this in C#, because it directly leads to a statistics page, and I need them in my program. Does anyone know how I have to code this or could anyone give me some advice?
<form name="TNLogin" method="POST" action="https://www.telenet.be/sys/sso/exec_login.php">
<input name="goto" type="hidden" value="http://www.telenet.be/mijntelenet/index.php?content=https%3A%2F%2Fwww.telenet.be%2Fsys%2Fsso%2Fjump.php%3Fhttps%3A%2F%2Fservices.telenet.be%2Fisps%2FMainServlet%3FACTION%3DTELEMTR%26SSOSID%3D%24SSOSID%24">
<input class="textfield" type="text" name="uid" size="24" border="0">
<input class="textfield" type="password" name="pwd" size="24" border="0">
<input type="submit" value="Aanmelden" border="0" />
</form>
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i have an array of strings that represent filenames with the path. i want to find the last directory that is common between all the files.
ex:
c:\dir1\dir2\abc\abcd\file.ext
c:\dir1\dir2\abc\efgh\file.ext
c:\dir1\dir2\abc\efgh\123\file.ext
the last common directory would be c:\dir1\dir2\abc\
what would be the easiest way to go about this?
thanks,
Rob Tomson
--
There are 10 kinds of people. Those who understand binary and those who don't.
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Hi,
I need to make sure that a program I distribute can only be run on systems that I have authorized.
I am looking for a piece of code to enumerate a per system unique identifier that is reproducable for this system every time you launch the program and will support Windows 95/98/2000 and above.
Any help is appreciated! Thx,
-Martin-
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You have to make combination of some hardware identites, like HD,CPU id(if its not disable),MAC Address,... there is not one specific unique thing for your computer.
Mazy
"A bank is a place that will lend you money if you can prove that you don't need it." - Bob Hope
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I have a collection of Items
I Want To select random given numbers from the collection
Without Select an Item Twice
in Other Word If The Collection have 25 items i want to
Select 7 items form it without select an item twice
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I don't think this is best approach,other CPains please correct me:Use Random class to create random numbers and store each number in seprate place and check second time create another number and check if that number is not used before.
Mazy
"A bank is a place that will lend you money if you can prove that you don't need it." - Bob Hope
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Thanks Mazdak for your Reply
I Thought about Solution Like Yours
That I Create arraylist and store the value and check about
its existig before add item to the arraylist and loop until
I have the selected number but i didn't use this solution
becaus i think that may be lead to infinit loop
In other words what happend if some items in collection never selected and i still need more item i'm not sure if this true all the algorithms
in Random Class Designed to avoid This situation
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What I've done in the past is:
1. Add the objects (numbers in your example) to a collection, so that the collection count is 25 (items 0 through 24).
2. Create a loop to select n items from the collection.
3. On each iteration of the loop, select a random number from zero to collection.Count - 1
4. Retrieve the collection element at the selected index from the collection, then remove it from the collection. The next time the loop iterates, the previously selected item will no longer be selectable, it has been removed from the collection.
There are various optimizations over using a collection, depending on the type of item you're trying to select (reference type, character, integer etc), but the principle is valid, assuming that your original range contained no duplicates.
Hope this helps.
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I'm attemping to create a custom control for the first time and I cannot figure out what I'm doing wrong. I'm attempting to inherit from TreeView using the folowing:
public class HL7TreeView : System.Windows.Forms.TreeView
I've added some properties and Methods and built the new DLL. I then am able to add it to my ToolBox with (Add/Remove ToolBox Item). But when I attempt to drag it into my Designer I get a StackOverflow exception. I've rebooted countless times. I even attempted a UserControl instead of a CustomControl with the same results. Any thoughts ?
I think I might have found the problem....
I commented out the Get and Set command for my properties and the error no longer occurs. Can i not use Gets andf Set with CustomControls ?
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