Hi everybody,
I am trying to learn visual C++ and this is my first problem in building a Widows application:
A textbox control can handle data of Text type only. For example, if I have a form with a TextBox named textBox1, and I have the following code under a button:
int x;
x = textBox1->text;
I woul get the followin error when compiling:
error C2440: '=' : cannot convert from 'System::String ^' to 'int'
Now, how can I change the data type of a textbox so that it can take numbers
Would appreciate any input.
Thank you in advance,
Making TextBox handle Numerica values?
Bil Click
Thanks a lot Oshah.
This is very useful.
SauravSen
The problem is textBox1->Text is a string. This string can contain any type of value.
there is a method that converts textr to integers. It is called Int32::Parse
It is a static method of the class Int32.
The following code would be
// Int32::Parse(textBox1->Text); // don't use this unless you know for a fact it will never be an invalid value otherwise it will throw an exception.
Int32 result;
if (Int32::TryParse(textBox1->Text, result)==true)
{ MessageBox::Show(result.ToString()); }
else
{
MessageBox::Show("Invalid number specified");
}
Sergey Barinov
Thanks a lot for your response, MakD.
I tryied your code and it worked fine.
woul you plesae help me figuring out the following
If we want to display an output of numiric vallue through a taxtbox (or a label), do we have to convert it to string first if yes, how
One more thing please, what if we are dealing with a float and not an integer
Thank you once again.
edwin220
To perform the reverse of converting a String^ to int (ie. convert an int to a string), use the ToString method of int.
textBox1->Text = x.ToString();
You can control the format of the output by using the second overload of ToString():
textBox1->Text = x.ToString("00");// pads single digit values with an extra zero: eg. 01 02
(the output format is similar to the format string MS Excel uses).