pass struct variable of winform.cs into class

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i made structure into code behind of form1[Design].

C#

struct ImagedetailsStructure
{
   internal UInt32 Imagesize;
   internal UInt16 versionNum;
}

then create object of struct i the form1.cs(code behind of form1[Design]).

C#

ImageHeaderStructure IHS = new ImageHeaderStructure();

then i use this variable in the function that is also made in form1.cs.

C#

public void Imagedetails()
{
   try
   {
       openDialogueBox();
       using (StreamReader sr = new StreamReader(path))
       {
           string ReadImageData = sr.ReadToEnd();
           byte[] readImageDataIntoBytes = StringToByteArray(ReadImageData);
           calculateDataLength = Convert.ToUInt32(readImageDataIntoBytes.Length);
       }
       IHS.Imagesize = calculateDataLength - 16;
       IHS.versionNum = 0x00ff0f;
   }
   catch
   { }
}

the i called this function into class1.

and the variable of struct Imagedetailstructure is imagesize and versionnumber values i want to get.
but if i am creating object of structure and accessing the values of variable its coming 0.
but i want to get the values of IHS.ImageSize. that assigned in imagedetail function.

please help me.

Posted 20-Nov-13 2:17am

bunty swapnil

Updated 20-Nov-13 2:22am

Orcun Iyigun

v2

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Comments

BillWoodruff 20-Nov-13 14:07pm

"the i called this function into class1."

Without knowing how you exposed IHS to class1, I don't think we can help you.

bunty swapnil 21-Nov-13 0:06am

I class i inherit form 1.

class1: form1

then imagedetailsstructure is coming. and when i am writing IHS.Imagesize value is not coming.
i am getting 0.

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johannesnestler · Answer 1 · 2013-11-20T03:15:00

Quite shure you got traped by reference vs. value type problem. Had some discussions about it lately - my rule of thumb: never use struct when you can use class in C#. I see no reason for you using a struct (more likely you come from another "language" like I did...). If you want to pass the pointer to a valuetype arround use ref (or out) keyword in the parameter definition and on the call. But don't, just change to class and it will work as you expect - I assume (you did not show the relevant code - the code where you make the call "into class1").

Off-Topic: Funny, even for quick examples I name all my "objects" (Forms, Classes, ...) with meaningfull names, and for production I have a coding rule (FXCop) that a variable can't be named like the class name + number (like button1 and all the VS designer defaults), cause if someone didn't find the "time" to name the "button" chances are high the quality of the code behind (Click-handler whatever) isn't "good" too...

pass struct variable of winform.cs into class

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pass struct variable of winform.cs into class

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