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I have a screen shot that I want to analyze. Rather than do it pixel by pixel I am cutting up the screen shot into different sections. I want to analyze the palette and if a certain range of colors exist then do some additional processing.
<br />
Bitmap test = new Bitmap(pictureBox1.Image).Clone(new Rectangle(0,0,100,50), System.Drawing.Imaging.PixelFormat.);<br />
Color[] Entries = test.Palette.Entries;<br />
foreach (Color colorSearch in Entries)<br />
{<br />
}<br />
However, with the above code the palette has no Palette.Entries. Is there a way to force palette creation on the bitmap or do I need to use a different image format(Something I hadn't thought until now).
I attempted to try and force the Format8bppIndexed enum from PixelFormat, but that failed with an out of memory error. I'm assuming because there are more than 256 colors in the rectangle.
Another idea I had, but have no clue how to implement, is to change all the colors that are similar to a single color. But I think that still won't work without a palette. I honestly have no idea here.
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I guess I answered my own question when I was writing. So just incase anyone else wants to know. Save the image as Gif and the Palette is created.
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Hi friends!
I have no idea that how I can convert the image into the sketch style? Using the C#.Net.
Please suggest to me or give the helpful hints…………I will be very thank full to all of you……….this image conversion is a part of my FYP……..i used many algorithms for conversion of image but these algorithms are not efficient ...I have been trying since last month but i fail.....please guide me
Thanks Again!!
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hi..
I downloaded a code from codeproject.com run the program, and when I click to find devices, it gives me PlatformNotSupportedException ... and Bluetooth.Net not supported on this device..
i looked everywhere and found out that bluetooth stack should be installed on my pc, well i looked for this bluetooth stack but found nothing, i'm using XP Home SP2 .. and C#.NET 2005 .. InTheHand.Net library for coding ... please help me out .. !
anyone worked on a bluetooth related project before .. ?
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Do you even have a BlueTooth interface in your machine?? If not, installing the drivers for it won't do you any good...
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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thanks for you reply ..
but what do you mean by bluetooth interface .. ?
i have a dongle bluetooth device, and its working perfectly using the application that came with it ... but using the C# application ... i got the above error ... !!
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NiZaR.TecH wrote: but what do you mean by bluetooth interface .. ?
This:
NiZaR.TecH wrote: i have a dongle bluetooth device, and its working perfectly using the application that came with it
OK. Does the interface show up under Start/Settings/Network Connections? If not, you're not going to be able to use it in your code. This could be why you're getting the error you are.
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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yes it does,
and guess what ... i've tested my application on another pc with another USB device, and it worked, it seems that the problem is in the dongle bluetooth device, but another problem came up ... when I click find devices, it shows nothing .. 
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Hello!
Hope you all are doing great! We were having clumsy sort of issue! details are as follows:
- We have c# windows application, which processes the data(simple text file, huge in size aprox. 40Gb).
- Doing so, it doesnot show any sort of items on the form, it looks as if its hanged/not responding
- Application consists of 1 form, which contains few performance indicators, few labels, few progress bars.
- But in reality it is working and processing the data(checked from the task manager, and also the output file is generated very accuratly).
- From start till end application utilizes 100% of the cpu.
- If we try to run any other program even notepad, system hangs n we have to restart it!
We are using Windows Server 2003, any sort of help, idea, suggestion, question will definitly be appreciated! !
Thanks in advance!
Adeel
--
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Processing 40GB file is very expensive for computer. The time it takes will depend on the computer you are running it on. Also use threads in your application
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Very right , but why it is not showing up the items(labels, progress bars...etc), and how can we make it show them and also do the processing as well!!?
The machine specs are 2.8E GHz HT Processor, 1 GB RAM, 160 GB SATA-II Drive!
Any suggestions how shall we implement threads, like processing in seperate thread? is this what you mean? and wil it solve the issue
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Have a look at Backgroundworker component. It has got a good example
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It sounds as if you are doing your file processing on the UI thread, and you are not allowing any time to any other threads.
1> do the data processing on a worker thread, use
2> do a small chunk of processing then call Thread.Sleep(ms) to allow other things to run for a few ms, that way you don't hog 100% of the CPU.
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Ok, will surely give it a try, and will let know of the result! Thanks both of you! !
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 ! Thanks Rob, shifted the processing part on the workerthread, and without calling Thread.Sleep, its working great!!! !
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Create a BackgroundThread for processing the file. If you are storing the data read from the file in memory, make sure it does not consume too much ( Check the return value of FileStream.Read which returns the number of bytes read and add them to a "long totalBytesRead = 0;" variable each time as "totalBytesRead += bytesRead" and check:
if(totalBytesRead <= (1024*1024*50)) // more than 50 MB
{
ReadMore();
}
else
{
ProcessCurrentData();
CleanMemory(); // reset the read buffer forexample
}
And don't forget Application.DoEvents(); method 
Hope this helps...
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I am trying to load a list of number in a combobox, it seems to be reading the xml file elements but it is reading my numbers as the index for the combobox
here is my xml file data that is is reading
<Days>21, "21"</Days>
<Days>20, "20"</Days>
<Days>19 19</Days>
<Days>18</Days>
<Days>17</Days>
<Days>16</Days>
<Days>15</Days>
<Days>14</Days>
<Days>13</Days>
<Days>12</Days>
<Days>11</Days>
<Days>10</Days>
all i get is a blank drop down list, if you want to see the code let me know but the code is working to read the other elements and filling text boxes
-- modified at 9:53 Saturday 5th May, 2007
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Well, as you guessed, posting relevant code will be helpful.
BTW your XML file doesn't seem very elegant, for instance, in:
<br />
<Days>21,"21"</Days><br />
you enclose two pieces of info inside a single item. Maybe it is not a good idea.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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xtr = new XmlTextReader(filename);
while (xtr.Read())
{
if (xtr.NodeType == XmlNodeType.Element)
{
if (xtr.LocalName.Equals("Days"))
{
this.cbodays.Items.Add(xtr.Value);
}
}
}
the <Days>21,"21"</Days> was just test data, I was trying to use the <Days>20</Days> but that gave me just the blank drop down box, so i was wondering if it just took my numbers and made them the index of the combobox so I put a few different data formats in the XML file to see if that made any difference
I have used a switch statement to check for XmlNodeType.Element and gives same results, if I change .equals("days") to an name that is not in the file I just get one blank drop down, currently it looks like it see that there are the right number of records but no data in the drop down
Rob
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Planker wrote: this.cbodays.Items.Add(xtr.Value);
Substitute xtr.Value with xtr.ReadElementString() in the above line.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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Thank you, that worked. is there a reason that xtr.Value works for text boxes and you need readelementstring for combobox?
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No, there isn't. I think that xtr.Value doesn't work for text boxes too. But I must test it...tomorrow...maybe!
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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thank you for your help, wondering if you could answer a question about writing back to the xml file.
I think you are right, I looked at my other code again and i was using ReadString
I am getting an error at run time on this line of code
newDayIndex.InnerXml = index.ToString();
here is how i'm doing all the xml code
XmlTextReader reader = new XmlTextReader(C_strFileName);
XmlDocument doc = new XmlDocument();
doc.Load(reader);
reader.Close();
XmlNode oldIndex;
XmlElement root = doc.DocumentElement;
oldIndex = root.SelectSingleNode("/config/Days_Index");
XmlElement newDayIndex = doc.CreateElement("Days_Index");
newDayIndex.InnerXml = index.ToString();
root.ReplaceChild(newDayIndex, oldIndex);
doc.Save(C_strFileName);
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1) You should first correct these:
<days>21, "21"
<days>20, "20"
2) Then check if it you are really reading the values from the XML file correctly.
3) Use Convert.ChangeType(...) to convert the values you read to a specific type if you want.
4) Update ComboBox.DataSource Property with the list of values you read ( check out MSDN Library for ComboBox.DataSource Property on how to add specific, custom data sources to ComboBox )
Hope this helps...
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Thanks for the info, i got the loading of the combobox working, i am not trying to figure out how to save the changes back to the xml file if the user changes the value.
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