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I know pass by reference. The problem was to hold the reference and change it's value later on. It looks like as I thought it's only possible by wrapping a struct type inside a class and sending reference to that class and using it to access the struct inside or sending a reference to current class that this struct is a member of which is another way of saying same statement.
From kind help of others I conclude it this way: To store for later access to a state of another class, we need to have that class.
If I was using my brain before asking the question, it was obvious. C# keeps track of references to objects. If someone uses internal data of an object without accessing a reference to that object how can garbage collector find out that it has to keep an object alive even if no one has any reference to that object. No reference = removing it and now a reference to a type inside an object that does not exists is what we ended up. That maybe why we must use class to access it's members. Also as stated earlier it's absolutely a bad design.
Thanks for the help anyway.
"In the end it's a little boy expressing himself." Yanni
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Technically it is possible using boxing (http://www.csharphelp.com/archives/archive100.html[^]).
You can use an object for your local variable, and assign any value type to it. If you pass this object as a parameter, its reference (address) is passed, so the called method can change the local variable of your class.
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hi,
My goal is to create backup for a directory every 5 minutes.
But here is the trick, this backup needs to be done during my working with files on this directory.
which means that I would probebly have a word document open while the directory is beening backup.
so far every move that I've made I recived "cann't access file".
Please help...
tnx
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Correct, you can't copy a locked file. No way around it.
Christian Graus
Driven to the arms of OSX by Vista.
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yes, you can't access a locked file.
Christian Graus
Driven to the arms of OSX by Vista.
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tnx but my problem is bigger than this.
I need to buckup the whole folder including other files that might be in use (xls,spss & etc.)
it's a pain. but tnx anyway
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Hey uh, i have a project and its considered as a thesis project in our school. My project is an automatic controlling model for monitoring and triggering.
A webcam or any camera will be attached to monitor object in a two dimensional frame with x and y axis. My problem here is, for initial run of the program(the camera is already in front of the frame) the camera will monitor if there is a change in the plane, like for instance the frame is a white board and I put a dot in the white board, the program would determine the coordinates of that dot(.) in the x and y axis of the plane in front of the camera. And once that coordinates is located, a pointer like a laser pointer attached to stepper or servo motor that is connected to the (parallel) port of the computer, will point to that coordinates computed by the program.
my specific problems are:
1. how would the program know the coordinates of the interrupting object?
2. how would the pointer that is attached to the stepper motor point the coordinates of the plane in front of the camera?
these are my major problems.
My adviser told me that the camera will be used as an actuating device. But I would ask for a better actuating device to monitor an interrupting object on the frame. Please do advise or help me I'm just a 4th year student and I don't even have a background of device interface programming, and I am also a beginner in C#.Net or VB.Net language please do help me. I can't graduate without this. Please
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Tiunay wrote: I can't graduate without this. Please
Sorry, but if this is above your technical skills, you shouldn't graduate - simply because you don't fulfill the requirements. (Or maybe the requirements are not appropriate. Don't know and don't care...). Do your homework!
This is not a free-of-charge coaching place!
Thomas
www.thomas-weller.de
Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.
Programmer - an organism that turns coffee into software.
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hey sir uh, no offense please
but its not about the homework or unaccomplished material or something
maybe its not like your school but uh let me tell you that its not like any school in US that spoon feed students. I'm here in the Philippines and our school is a type of school that doesn't spoon feed students. It mean that, our challenge that is the point of our studies, just how we knew the language in C++ or Java is also the same. We were given a problem and they let us decide whatever we do just to show them that the program is working properly.
It is hard for me to use C or Java for that specific problem that is why we are obliged to study other language in just a short period of time. The strategy of our school is to guide the students only and this is not the same in US that trains even a simple logic to students.
What I'm trying to Please is Only a GUIDE and ADVISE.
Please if you don't like to help me or give me some guidance, please be advised to please don't comment anymore. You'll just waste you time.
What I'm seeking is help not a Sermon.
Thanks.
modified on Wednesday, November 26, 2008 4:32 AM
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Read my image processing articles for ideas on how to look through a bitmap to work out if an area is black instead of white.
Christian Graus
Driven to the arms of OSX by Vista.
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Christian thank you. I really appreciate it.
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Hi,
I'm trying to do this and am wondering if it is possible.
I have a DataGridView control. I would like the ToolTip message to show some data (on the DataGridView itself) when the cursor is over that particular row in the control. If the cursor is out side the data rows but within the control (i.e. in the parts that have no data), I would like it to show another message.
I have tried this.
private void grid_CellMouseEnter(object sender, DataGridViewCellEventArgs e)
{
if (e.RowIndex != -1 && ds.Information.Rows[e.RowIndex]["Value"] != null)
{
this.grid.CurrentCell.ToolTipText = ds.Information.Rows[e.RowIndex]["Value"].ToString();
}
else
{
toolTip.Show("Right-click to display menu", this.grid);
}
}
What do I have to do to get it working?
Thanks.
modified on Wednesday, November 26, 2008 8:55 PM
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what's the best way to implement an add-in to the explorer using C#?
WPF? Win Form?
thanks
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i need help
i nedd to create barcode report with customize size
mean the customer can change the size of the barcode report and the lables to print because i have many customers work on same soluation and need barcode report in different size so i don't need to create specific barcode for each one
i need 1 barcode report that print in custome parper soze and custome label size that user choose it
thanks alot
md_refay
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There's an article on CP on generating barcodes.
Christian Graus
Driven to the arms of OSX by Vista.
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CP means Code Project (this is the website you are on when reading this text...  .
www.thomas-weller.de
Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.
Programmer - an organism that turns coffee into software.
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Dlsoft (www.dlsoft.com) sells an adequate barcode tool. Their technical support is very helpful if you have problems.
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in my application i have some 4-5 tabs. what i need is on a button click the tab containing the ACtiveX control should be selected and the shared screen should be shown. the problem comes when i click on the button the corresponding tab is shown but gives an error of InvalidStateException. Maybe the ActiveX control needs some time to load .... becz if i am putting a message box there it works fine.
is there some way in which i can wait or check until the control has been loaded.
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i am unsing ADONET for my database. What's happening and how to solve it if i have error :
1.Database: Object reference not set to an instance of an object
2.Data type mismatch in criteria expression.
3.The field is too small to accept the amount of data you attempted to add. Try inserting or pasting less data
Thanks.
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1 - fix your code. This means an object is null. Can't say more without seeing code
2 - fix your code. You're trying to compare objects of different types. Perhaps missing quotes from a string ?
3 - Fix your code, specifically make your code not accept data that's longer than the DB column will accept, or make the DB column bigger.
Christian Graus
Driven to the arms of OSX by Vista.
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hi all I have a combo box with display member and value member
but all the value contain a unicode and all the unicode contain the character '\'
when i retrive the value from the combobox it's return to me the unicode with "\\" and it is't fell my requirment
who can i solve that.
KimoKono
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None of this makes any sense. All strings in C# are unicode. I think you need to post your code so we can see what you're doing wrong.
Christian Graus
Driven to the arms of OSX by Vista.
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