I want to create multiple forms and when I click the back button it will back to form1. I tried this C++/CLI - how to open a new form and back but when I click the button in the form2 to go back to form1 it gets an error. " NullReferenceException was Unhandled"
Form1
private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) {
/* Form1::Hide();
Form2^ form2 = gcnew Form2();
form2->ShowDialog();*/
Form2 ^ frm2 = gcnew Form2();
frm2->Show();
this->Hide();
}
Form2
Form2(System::Windows::Forms::Form ^ frm1)
{
otherform = frm1;
InitializeComponent();
}
private: System::Windows::Forms::Form ^ otherform;
#pragma endregion
private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e
{
this->Hide();
otherform->Show();
}
You have created the second constructor of Form2 but you are not using it inside button1_Click.
Instead of this:
Form2 ^ frm2 = gcnew Form2();
Do this:
Form2 ^ frm2 = gcnew Form2(this);
Related
i have single tab page in form1 and a button is placed inside tab to open a childForm(Form2).... Form2 loads pefectly in tabpage1 on buttonclick ..... and now on ChildForm(Form2) i have another button to call For ChildForm(Form3) ...but somehow it doesn't Load..nor throw some error ....well here is my Code
public Form1//
private void LoadForm(object Form)
{
Form childForm = Form as Form;
childForm.TopLevel = false;
int curr = tabControl1.SelectedIndex;
TabPage tbp = tabControl1.TabPages[curr];
tabControl1.TabPages.Contains(tbp);
tbp.Controls.Add(childForm);
childForm.WindowState = FormWindowState.Maximized;
childForm.Show();
Refresh();
}
private void button1_Click(object sender, EventArgs e)
{
LoadForm(new Form2());
}
public void OpenForm();
{
LoadForm(new Form3());
}
Form2//
private void button1_Click(object sender, EventArgs e)
{
Form1 f = new Form1();
f.OpenForm(new Form3());
}
}enter image description here
}
public Form1//
private void LoadForm(object Form)
{
Form childForm = Form as Form;
childForm.TopLevel = false;
int curr = tabControl1.SelectedIndex;
TabPage tbp = tabControl1.TabPages[curr];
tabControl1.TabPages.Contains(tbp);
tbp.Controls.Add(childForm);
childForm.WindowState = FormWindowState.Maximized;
childForm.Show();
childForm.BringToFront();
Refresh();
}
private void button1_Click(object sender, EventArgs e)
{
LoadForm(new Form2());
}
public void OpenForm();
{
LoadForm(new Form3());
}
Form2//
static Form1 f1;
Public Form2( Form1 refer)
{ InitializeComponent();
f1 = refer;
}
private void button1_Click(object sender, EventArgs e)
{
f1.LoadForm();
}
I am developing windows form chat application and i am writing message in richtextbox but when i click on send button and every message show in webbrowser control. .i want to add webbrowser control dynamically for individual message is send.i am using following code:
namespace WindowsFormsApplication1
{
[ComVisible(true)]
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
// this.w1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(w1_DocumentCompleted);
}
WebBrowser w1 = new WebBrowser();
private void button1_Click(object sender, EventArgs e)
{
this.Controls.Add(w1);
HtmlElement div = w1.Document.GetElementById("abc");
div.InnerHtml = richTextBox1.Text;
}
private void Form1_Load(object sender, EventArgs e)
{
w1.Navigate(Path.Combine(Environment.CurrentDirectory, "HTMLPageForScripting.htm"));
}
}
}
Here is the case you asked for:
Add a Panel to form to put browser in and set its autoscroll property to true;
In button1 Click event, create browser, set its width and height, and navigate to the document you want.
In button1 Click event subscribe for DocumentCompleted event and add content there. We do add here because we should be sure all contents containing <div id="abc"></div>has been loaded.
Here is code:
private void button1_Click(object sender, EventArgs e)
{
var browser = new WebBrowser();
browser.Height = 100;
browser.Dock = DockStyle.Top;
browser.Navigate(#"D:\test.html");
browser.DocumentCompleted += browser_DocumentCompleted;
this.panel1.Controls.Add(browser);
//Just do it to put it at the end of list and scroll to it
browser.BringToFront();
this.panel1.ScrollControlIntoView(browser);
}
void browser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
var browser = (WebBrowser)sender;
HtmlElement div = browser.Document.GetElementById("abc");
div.InnerHtml = richTextBox1.Text;
}
Im pretty new to programming, but im very eager to get more into this stuff, and in particular, c#. I have a made some code for an autotyper (spam bot if i may), only to be used as a goal for me to create. Essentially, what i want the program to do, is as following:
When i start my Form1, the global variable "_timerValue" is set to
1000
When i hit Start button, the text from the textbox on will be sent at
the interval of "_timerValue"
When i hit the Speed button, Form2 will show.
When i hit very fast, "_timerValue" is set to 5000 (testing purposes)
Form1 code:
public partial class Form1 : Form
{
static class TimerIntervalValue
{
Form2 f2 = new Form2();
TimerIntervalValue = f2._timerValue;
}
public Form1()
{
InitializeComponent();
f2._timerValue = "1000";
}
public void timer1_Tick(object sender, EventArgs e)
{
SendKeys.Send(textBox1.Text);
}
private void button1_Click(object sender, EventArgs e)
{
timer1.Enabled = true;
}
private void button1_MouseDown(object sender, MouseEventArgs e)
{
MessageBox.Show(f2._timerValue);
timer1.Interval = Convert.ToInt32(f2._timerValue);
if (timer1.Enabled == false)
{
timer1.Enabled = true;
textBox1.Enabled = false;
button1.Text = ("Stop");
}
else if (timer1.Enabled == true)
{
timer1.Enabled = false;
textBox1.Enabled = true;
button1.Text = ("Start");
}
}
private void button2_Click(object sender, EventArgs e)
{
Form2 form2 = new Form2();
form2.Show();
}
}
Form2 code:
public partial class Form2 : Form
{
public string TimerValue;
public string _timerValue
{
get { return TimerValue; }
set { TimerValue = value; }
}
public Form2()
{
InitializeComponent();
}
public void button1_Click(object sender, EventArgs e)
{
Form2 frm2 = new Form2();
frm2._timerValue = "5000";
}
}
I originally tried to create a Form2 instance just under "InitializeComponent();" in Form1, but that didnt seem to be accessible through the other funtions.
I just know its something very simple like im using the wrong class to create the Form2 instance or something like that ...
Anyway, thank you in advance
Just mark TimerValue and _timerValue as static. Then you don't need to use
Form2 f2 = new Form2(); or Form2 frm2 = new Form2();
anymore. In Form 1, just use Form2._timerValue instead of f2._timerValue. In Form 2, just change:
public void button1_Click(object sender, EventArgs e)
{
_timerValue = "5000";
}
Have two forms-Form1 & Form2.Form1 has a button(btnNew),which opens Form2 on click, and is disabled.I need to enable the button again, only when Form2 is closed.User needs to use Form1 also simultaneously.This code is not enabling the button again. Where am I missing.
In Form1:
private void btnNew_Click_1(object sender, EventArgs e)
{
Form2 f2 = new Form2();
f2.Show();
btnNew.Enabled = false;
}
public void EnableButton()
{
btnNew.Enabled = true;
}
In Form2:
private void Form2_FormClosing(object sender, FormClosingEventArgs e)
{
Form1 f1 = new Form1();
f1.EnableButton();
}
You code creates a new Form1 which will be different from the one already running in your application.
You could try adding a reference to Form1 in your Form2 and operate on it's controls that way.
Give form2 a property like:
public Form ParentForm {get; set;}
And assign it form1 in your button click:
Form2 f2 = new Form2()
f2.ParentForm = this;
f2.show();
Then in your closing you should be able to do something like:
this.ParentForm.EnableButton();
Subscribe to your Form2 closing event from within the class that is instantiating it (Form1).
private void btnNew_Click_1(object sender, EventArgs e)
{
Form2 f2 = new Form2();
f2.Closing += f2_Closing;
f2.Show();
btnNew.Enabled = false;
}
public void f2_Closing(object sender, FormClosingEventArgs e)
{
this.EnableButton();
}
public void EnableButton()
{
btnNew.Enabled = true;
}
I need to build an array to contain objects. However, it does not work and I could not find out the error myself. Please help
# include "CRegistration.h" //My object class
SKIP MANY LINES
public:
Form1(void)
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
array<CRegistration^> ^CregArray = gcnew array<CRegistration^>(100);
record_number = 0;
}
private: System::Void MyAdd_Click(System::Object^ sender, System::EventArgs^ e) {
Form2^ myForm2 = gcnew Form2();
if (myForm2->ShowDialog()==System::Windows::Forms::DialogResult::OK) {
record_number = record_number + 1;
CRegistration^ Creg = gcnew CRegistration(System::Convert::ToString(record_number),myForm2->TempReg[0],myForm2->TempReg[1],myForm2->TempReg[2],myForm2->TempReg[3]);
CregArray[record_number-1] = Creg;
}
}
};
change line
array<CRegistration^> ^CregArray = gcnew array<CRegistration^>(100);
to
CregArray = gcnew array<CRegistration^>(100);
add field declaration:
Form1(void)
{
..
}
array<CRegistration^> ^CregArray;
private: System::Void MyAdd_Click(System::Object^ sender, System::EventArgs^ e) {
..
}