©Something Different

Re: Error in declaring a bitmap as the .image of a picture box

25-Apr-09 22:57

Um.. with the code he gave you to do it ?

Christian Graus

Driven to the arms of OSX by Vista.

"I am new to programming world. I have been learning c# for about past four weeks. I am quite acquainted with the fundamentals of c#. Now I have to work on a project which converts given flat files to XML using the XML serialization method" - SK64 ( but the forums have stuff like this posted every day )

sebogawa25-Apr-09 23:03

sebogawa

25-Apr-09 23:03

he said that I can do what he told me too or convert the picturebox image to a bitmap...i still get the invalid parameters error when i click on the image ....how do i do the picturebox image to bitmap conversion...i think there is something wrong with my code that is causeing the error

Re: Error in declaring a bitmap as the .image of a picture box

Luc Pattyn26-Apr-09 0:48

26-Apr-09 0:48

Hi,

several comments:

1.

sebogawa wrote:
txtMouseX.Text = e.X.ToString();
int mouseX = int.Parse(txtMouseX.Text);

What a waste. You already have e.X as a number, why do you need to parse a string then. Just write

int mouseX = e.X;
txtMouseX.Text = mouseX.ToString();

2.
Bitmap refImage = new Bitmap(freezeFrame.Image);
You claim the problem is here, I doubt that. There are two ways this could fail:
a) freezeFrame.Image being null would result in a NullReferenceException
b) freezeFrame.Image being of some special ImageFormat (such as EMF) might cause problems, I'm not sure though.

3.
Color currentPixel = (refImage.GetPixel(mouseX, mouseY)); would throw an ArgumentOutOfRangeException when mouseX and/or mouseY fall outside the image.

4.
redMinUpDown.Value = currentPixel.R - rangeLimit; may cause problems since the lowest achievable value is negative (-rangeLimit). If Value is set outside [Minimum,Maximum] an ArgumentOutOfRangeException will be thrown.

Overall, your code is low-quality as it lacks a lot of checks.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

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[Message Deleted]

Mohamed Ibrahim Omar25-Apr-09 11:22

Mohamed Ibrahim Omar

25-Apr-09 11:22

[Message Deleted]

Christian Graus25-Apr-09 11:26

25-Apr-09 11:26

If you want 4 bits, you could store two values in each byte ?

Mohamed Ibrahim Omar25-Apr-09 12:05

Mohamed Ibrahim Omar

25-Apr-09 12:05

did you read my Question well,I doubt

what this means:
Driven to the arms of OSX by Vista.

"I am new to programming world. I have been learning c# for about past four weeks. I am quite acquainted with the fundamentals of c#. Now I have to work on a project which converts given flat files to XML using the XML serialization method" - SK64 ( but the forums have stuff like this posted every day )
!!!!!!

Mohammed Ibrahim

fly90425-Apr-09 12:37

fly904

25-Apr-09 12:37

Mohamed Ibrahim Omar wrote:
what this means:
Driven to the arms of OSX by Vista.

"I am new to programming world. I have been learning c# for about past four weeks. I am quite acquainted with the fundamentals of c#. Now I have to work on a project which converts given flat files to XML using the XML serialization method" - SK64 ( but the forums have stuff like this posted every day )
!!!!!!

Do you mean that you don't understand what it actually means or don't understand that it's his signiture?

Either way it's the funniest thing I've read all day!

My failometer is detecting vast quantities of FAIL!

Christian Graus25-Apr-09 13:23

Re: 4 bits Array [modified]

25-Apr-09 13:23

Mohamed Ibrahim Omar wrote:
what this means:

It means that you are not very good at English. Perhaps this is why your questions are confusing, and you don't get the answers you want.

Mohamed Ibrahim Omar25-Apr-09 12:10

Mohamed Ibrahim Omar

25-Apr-09 12:10

you always (Christian Graus)give me bad answer

Mohammed Ibrahim

modified on Saturday, April 25, 2009 6:17 PM

Christian Graus25-Apr-09 13:22

25-Apr-09 13:22

Your question is kind of stupid. You want to make a byte equal to four bits ? You can't. There's no type that is four bits.

fly90425-Apr-09 12:33

fly904

25-Apr-09 12:33

Mohamed Ibrahim Omar wrote:
byte[]

And you wonder why it's a byte?

Not sure if this will help or not but have a look at BitArray[^]

My failometer is detecting vast quantities of FAIL!

Re: [Message Deleted]

Christian Graus25-Apr-09 22:59

How to handle null values when reading array

25-Apr-09 22:59

Seriously, everyone here wants to help you, you should try to make your question more clear, not delete it. I wasn't being insulting, if English is not your first language, that's not meant as an insult, but, if we can't understand what you mean, we can't help, that's all I was trying to say. Provide more detail and perhaps when we can better understand your need, we can offer better help ?

onetreeup25-Apr-09 10:23

onetreeup

25-Apr-09 10:23

I have an array that I am converting values from. It is a comma delimited file, and has some null values in it. While I am reading the file to convert, how can I handle the null values?

Christian Graus25-Apr-09 11:27

25-Apr-09 11:27

with code ? I don't see what the question is. If you are writing code to convert values, can't you check for null first ? It's up to you if you skip a null, or insert a default value in it's place.

onetreeup25-Apr-09 12:47

onetreeup

25-Apr-09 12:47

I apologize if my question seemed stupid. I am looking for assistance with the code, which is why I am in the C# message board. Cry | :((

Christian Graus25-Apr-09 13:24

25-Apr-09 13:24

If you posted some code, then perhaps we could assist you with your code. As it stands, we're struggling to understand what the hell you're talking about. If you have null values coming in ( we don't even know where from ), then you can check for them, surely ? Perhaps not, in your situation, but you've not come close to making that clear.

Luc Pattyn25-Apr-09 13:08

25-Apr-09 13:08

impossible to answer: you hardly described the input and didn't say a thing about the output.
explain more, AND give some examples.

Smile | :)

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Cannot read .xls file - microsoft jet database engine could not find the object error

Sibugathulla25-Apr-09 17:52

Sibugathulla

25-Apr-09 17:52

Please Don't Worry You can Solve NullException problem Using one of the two methods Smile | :)

.

1) If you create Your own Array Please Initalize it.

List<String> strArray= new List<String>();
 strArray.Add("Code Project");

Here new List<String>(); is important

2) If you get the list from any where else You can check for null as follows

if(strArray != null)
 if(strArray.Count >0)
    MessageBox.Show(strArray[0]);

SibGeth

Something Different™
www.SibGeth.net

dariusUK25-Apr-09 10:15

dariusUK

25-Apr-09 10:15

Hi there,

I'm trying to read .xls file using OleDb connection. I have two .xls files generated from SAP (actually these are Unicode text files saved as .xls) with two different names. When I execute my code I can only open one file, the second one gives an error:

System.Data.OleDb.OleDbException: The Microsoft Jet database engine could not find the object 'sheetName$'. Make sure the object exists and that you spell its name and the path name correctly.

Both files contains only one sheet which has the same name as the file itself. I've checked the spelling several times and even changed it manually but it doesn't work on one file. Even when I saved the file as proper Excel file. Here's the code I'm using:

//opens file and fills the DataGridView with data from file
string fileNameWithExt;
string fileNameWithoutExt;
int fileNameLength = 0;
int cutExtension = 4;
fileNameWithExt = openFileDialog1.SafeFileName;
fileNameLength = fileNameWithExt.Length;
fileNameWithoutExt = fileNameWithExt.Remove(fileNameLength - cutExtension);

OleDbConnection aConnection = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\" + fileNameWithExt + ";Extended Properties=Excel 8.0");
aConnection.Open();

DataTable sampleDataTable = new DataTable();

//clears data table and dataGridView before creating a new one
dataGridView1.DataSource = null;
sampleDataTable.Clear();
sampleDataTable.Columns.Clear();

                    
OleDbDataAdapter oleDbCommand = new OleDbDataAdapter("Select * from ["+fileNameWithoutExt+"$]", aConnection);
oleDbCommand.Fill(sampleDataTable);

I hope somebody can point me in the right direction as I checked plenty of posts and know that something is wrong with the sheet name but can find the issue.

Regards,

Re: Cannot read .xls file - microsoft jet database engine could not find the object error

Luc Pattyn25-Apr-09 10:29

Re: Cannot read .xls file - microsoft jet database engine could not find the object error

25-Apr-09 10:29

some questions:
1. are you having both xls files open at the same time?
2. are you closing aConnection when done with each file?
3. what is the full and exact content of fileNameWithExt in both cases?
4. in exactly which line does the exception occur?

Smile | :)

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dariusUK26-Apr-09 7:15

dariusUK

26-Apr-09 7:15

Hi,

1. No, just one file is being opened at the time
2. No, I'm not closing the connection Smile | :)

I am a newbie, so I'm just learning Smile | :)

but I think it's not the case as when I run my code for the first time and trying to open the "failing" file it can't be opened anyway
3. Full content of the fileNameWithExt contains a file name with extension i.e. someXlsFile.xls. As you can see in the code it use openFileDialog property SafeFileName:

fileNameWithExt = openFileDialog1.SafeFileName;

My files names are: wipasianew.xls (can be opened) and wipasia.xls (cannot be opened)

4. Exception occurs in this line:

oleDbCommand.Fill(sampleDataTable);

Hope you'll have any ideas. Thanks, Darius

Re: Cannot read .xls file - microsoft jet database engine could not find the object error

Luc Pattyn26-Apr-09 11:07