[bjones44]

Hello,

I have a double I would like to view in a textbox on button click, but i'm getting the following error "'void System::Windows::Forms::Control::Text::set(System::String ^)' : cannot convert parameter 1 from 'double' to 'System::String ^'"

Is there any easy way to convert double to System::string^?

This is the code in my button click event.

textBox->Text = MyDouble;

[JackOfAllTrades]

Doesn't ToString() work?

[bjones44]

Textboxes don't seem to be capable of holding normal strings.

'void System::Windows::Forms::Control::Text::set(System::String ^)' : cannot convert parameter 1 from 'std::string' to 'System::String ^'

[KYA]

I'm not all that familiar with Visual C++/managed, but how about:

//make a System::String pointer
System::String^ str;
str = MyDouble.ToString(); //may need a & here, not entirely sure about ^ pointers

//pass str to the function

This post has been edited by KYA: 08 April 2009 - 10:26 AM

[bjones44]

This works, thank you.

[skymoon7]

I have the reverse problem, meaning that I need to convert a System::String ^ to double. Anyone, has an idea what should I do? I appreciate it.

[JackOfAllTrades]

Double.TryParse() should help.

[fluke]

skymoon7, on 19 May, 2009 - 11:16 AM, said:

I have the reverse problem, meaning that I need to convert a System::String ^ to double. Anyone, has an idea what should I do? I appreciate it.

Example for a windows form, using one textBox and one label.
In the following, "huh" is a bool, "dubl" is a double:

// first check using TryParse if text converts to double from string
//true is returned if it converts
//also, it does the conversion and stores in variable "dubl".

  huh = double::TryParse(textBox1->Text, dubl);
               
            if(huh) // it converted sucessfully, use the value of "dubl"
	 { 
	   dubl *= 2.5; // mult dubl by 2.5 and store back in dubl
                     //display "dubl" in label1
	   label1->Text = dubl.ToString("###.00");  //2 dec points
	  }
	 else // "huh" not true, textbox was not a string convertible to double
                        // i.e. "1.23jkl"
	   {
                      label1->Text = "Not a number";
	    }

*** MOD EDIT: Added code tags. Please ***

This post has been edited by JackOfAllTrades: 12 December 2009 - 06:43 AM