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Hello,
I'm trying to use transparency colors on images with .NET CF 2.0. I am using the SetColorKey method of the ImageAttributes with the Color.Magenta as mask. On the .NET Framework, it works fine, the mask is applied, but on the .NET CF, I can see that the mask color has been replaced by the black color. So, how can I handle transparency colors on the .NET CF platform??? Can somebody help me?
Thanks for the help.
Best regards.
Fred.
There is no spoon.
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Hi,
I hope this is the right board for this (my first post here at codeproject).
I have a DataSet containing three Tables: address, country and project. There are two DataRelations defined. One address points to a country and some projects point to one address. I trying my luck with a lot of data binding, so I use some label controls to show the entries of one address.
For example:
myLabelAddressName.DataBindings.Add("Text", myDataSet.DefaultViewManager, "address.name");
To show all related projects in a listbox I use:
myListboxProjects.DataSource = myDataSet.DefaultViewManager;<br />
myListboxProjects.DisplayMember = "address.RelationAddressToProjects.projectnumber";
To control the actual data row to be displayed, I use a CurrencyManager:
CurrencyManager curr = (CurrencyManager) this.BindingContext[myDataSet.DefaultDisplayManager, "address"];<br />
curr.Position++;
This works quite fine so far, but now comes the problem. What do I do, if I want the correct country for every address being display (data bound) to another label? Remember, in this case the country table is the master and the address is the child.
I would think of something like this:
myLabelAddressCountry.DataBindings.Add("Text", myDataSet.DefaultViewManager, "address.RelationAddressToCountries.countryname");
The problem simply is, that I cannot create the relation RelationAddressToCountries, since there is not an address to every country, which would be mandatory. Can I somehow use the relation from countries to addresses backward?
Greetings,
Bob
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I have binding source that I created in the main form, since it has a grid on it. Now I want to use that same binding source to edit properties on a dialog that can be popped up.
How do I tell the designer to use that binding source? Do I put the binding source somewhere public/static? Is the designer smart enough to it out if I set a binding source field in the dialog (I'm about to try that).
In general, using the designer, how do I get one form to see stuff in another form?
I can't believe I'm asking such a basic question, because obviously I know how to do this in the code, but using the designer, I'm clueless. (Why I'm using the designer is another matter, let's just say I'm in a masochistic mood today).
[edit]In fact, I can't even figure out how the DataBindings thingy in the properties page even works in the designer[/edit].
Marc
Pensieve
Functional Entanglement vs. Code Entanglement
Static Classes Make For Rigid Architectures
Some people believe what the bible says. Literally. At least [with Wikipedia] you have the chance to correct the wiki -- Jörgen Sigvardsson
-- modified at 15:31 Wednesday 22nd March, 2006
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Can anyone direct me as to where to find examples of how to create a strategy game, such as checkers, by using C# in a windows application? I am most interested in how to draw a checker board and checker pieces, and how to allow the user to drag and drop a checker piece. I have been unsuccessful in finding this, so far, and it would be really neat to play with this type of code. Thanks.
jeff19
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Here[^] is an excellent example of chess. Look at the source to learn about drawing a board with GDI+ and handling mouse events.
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Does anyone have an updated link for this? I am also trying to create a checkers game using C# with a .Net Framework and this link for the chess setup doesnt seem to work for me. Any help would be greatly appreciated.
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I have tried using the following code: TapPage.Hide() to make a tab page invisible but nothing happens it just sits there laughing at me.
The tab page is placed on a Window Form in the Form design area and is not created dynamically.
Does anybody know what I can do to make it invisible?
I am the handsome one in the crowd.
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This is another way, "removing" it:
tabControl.TabPages.RemoveByKey("TapPage");
/j
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I think you have to remove the tab, that's the only way I can remember.
Ed
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Hi,
I need to distinguish progressive jpeg's from baseline jpeg's.
So far I retrieved all image properties using image.GetPropertyItem, and all properties are the same for these two kinds.
There is also function GetEncoderParameterList, but it can only (at least as far as I know) be used to set encoding properties when you want to save a file.
Do you know maybe how can I use GetEncoderParameterList for my purpose? Or, how can I distinguish these two types of JPEG's by reading and comparing bytes from image file.
Thanks
SW
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Progressive information is held in the JPEG compression header. You need to read in the jpeg file then access the fields by address. There are three single byte address fields (0xC2, 0xC6, 0xCA) that holds progressive information. Generally I think 0xC2 is always set if the jpeg is progressive.
So create a struct that contains the information you want and then read the file into that struct (fread, or the .NET equivlant), and then access the proper field.
Mike
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Mike,
Thank you for fast response. Could you post a sample code how I could access and retrieve that info using byte address fields (or a link to a website with similar code). I'm a kind of new to image processing and example would help me a lot.
Thank you again,
Sylvester
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Hey Sly,
Here is a link to some code samples to give you an idea on what to do. Don't follow exactly because the addressing doesn't line up, the BITMAPINFO struct doesn't break out the progressive address so you would have mask the information you need out of what it does hold.
http://www.experts-exchange.com/Programming/Q_21769844.html[^]
The last post might be a little better info. Also these snippets are written in C so you would have to translate that to C# .NET. Since I haven't done this type of stuff in .NET I can't tell where to head. 
-Mike
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Mike,
Unfortunately I don't have subscription on experts-exchange, but at least I know what to look for.
Thanks
Sly
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Sly,
You don't need a subscription (I don't) just scroll down far enough and you will see the whole post, you have to get past all the ads, and don't click on the "View Solution" button.
But just in case I am getting lucky:
Based on the info here:
http://www.fastgraph.com/help/jpeg_header_format.html
You can read in the necessary info, similarly to how I demonstrated with the above code (for bitmap).
Firstly, define a struct to store the JPEG header info in:
struct JPEGINFOHEADER
{
unsigned short id ;
unsigned short width ;
unsigned short height ;
unsigned char number_of_component ;
// etc etc
} ;
/**
* Return value:
* 0 - Successful
* -1 - Could not find/open the specified file
* -2 - Specified file is not a valid bitmap file
*/
int LoadJpegHeader( char *filename, JPEGINFOHEADER *jpegInfoHeader )
{
FILE *filePtr ;
filePtr = fopen( filename, "rb" ) ;
if ( filePtr == NULL )
{
return -1 ;
}
fread( JpegInfoHeader, sizeof(JPEGINFOHEADER), 1, filePtr ) ;
fclose( filePtr ) ;
return 0 ;
}
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Mike,
You are right, when I saw "View solution" I didn't even scroll down the page.
I also found a book which covers that topic very well. The title is:
"Compressed Image File Formats: jpeg, png, gif, xbm, bmp" by John Miano, 1999
It also has a CD with console application (jpegdump) written in c++ extracting all info from jpeg file.
Now, I only need to convert it to c#. Great!!! 
Thanks
Sylvester
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I have a web app and I would like to create Outlook contacts and assign them to groups in the Outlook address book. I'm using C# and Visual Studio 2005. Can someone help point me in the right direction? Thanks
paul
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Hi,
in a windows form I am trying to populate a datagrid from an arraylist. instead of getting the text value I am getting the length of each string in the array passed to the grid, in this case the number "5"
ArrayList list = new ArrayList();
list.Add("Test1");
list.Add("Test2");
dataGrid1.DataSource = list;
Any ideas?
thanks
brian
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Hi all,
I developing a windows application which will have login verification and other stuffs.
I want to lock the application when the user is idle (as like in windows ctrl+alt+del lock) for some time(say 1 hour - it should be confiurable parameter).
how can i do that in c#
I found one event in Application.idle but this event trigger once the UI get painted.
Regards,
Srini
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I use a class that implements IMessageFilter that is added as a message filter after the user has logged in (i.e. Application.AddMessageFilter). The filter contains a timer that gets reset everytime a mouse or keyboard message is received. If the timer ticks (i.e. no mouse or keyboard activity for a defined period of time - five minutes in my case) then my application becomes "inactive" (actually all it does is stop counting how much time the user has been using the program).
When a new keyboard or mouse event is received while the app is sleeping it will wake back up and start tracking time again.
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I am developing windows application to add "Outlook Contacts" to database. I need to provide option for choosing contacts folder.
I need sample code (or idea ) for displaying outlook contacts folders and extracting contacts from selected folder
Thanks in advance
Ram
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try entering acovado.com
once there you'll find various information on the subject !!!!!!!!!
(:
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We plan on purchasing the IP Works suite that nsoftware provides. We are going to spend around $8000
and just wanted to know if anyone has had any negative experience with them. I cant seem to find any reviews online so I am asking the CP community for help. 
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I created a custom control inherited from panel that will contain a collection of another custom control. I added an attribute 'Items' that startes the Collection Editor and adds however many instances of the the controls and add it to a collection class. All works fine, the control gets added to the collection, InitializeComponent gets modified, but for the new control to show up on the form I need to rebuild the parent form, THEN it shows up.
So my question is, does anyone have tips on what I need to do to get the control added to the collection to actually be displayed on the form upon adding it to the collection?
-Mike
(ps removal using the Collection Editor works fine)
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