Develop Reference

How to detect when the image appears in PictureBox

I have a problem about System.Windows.Forms.PictureBox. I want to show a image on monitor and capture it on the camera. So I use Winform which include a picturebox. The picture box is:
PictureBox pb = new PictureBox();
pb.WaitOnLoad = true;
When I set a bitmap to PictureBox and capture the image from camera,
// Show bmp1
this.image.Image = bmp1;
this.image.Invalidate();
this.image.Refresh();
// Delay 1s
UseTimerToDelay1s();
// Show bmp2
this.image.Image = bmp2;
this.image.Invalidate();
this.image.Refresh();
// Capture
CaptureImageFromCamera();
It only capture the bmp1.
If I add a small delay like this,
this.image.Image = bmp2;
this.image.Invalidate();
this.image.Refresh();
UseTimerToDelay100ms();
CaptureImageFromCamera();
It capture bmp2. The Image set method seem to be a async method. Does any method to confirm the image is set? Thanks.

I'd use the first Paint event after assigning the new Image.
You can give it a try using a very large image url from this site.
The example uses google logo image url. Copy the following code and make sure you assign event handlers to the events:
bool newImageInstalled = true;
private void Form1_Load(object sender, EventArgs e)
{
pictureBox1.WaitOnLoad = true;
}
private void PictureBox1_Paint(object sender, PaintEventArgs e)
{
if (!newImageInstalled)
{
newImageInstalled = true;
BeginInvoke(new Action(() =>
{
//Capturing the new image
using (var bm = new Bitmap(pictureBox1.ClientSize.Width,
pictureBox1.ClientSize.Height))
{
pictureBox1.DrawToBitmap(bm, pictureBox1.ClientRectangle);
var tempFile = System.IO.Path.GetTempFileName() + ".png";
bm.Save(tempFile, System.Drawing.Imaging.ImageFormat.Png);
System.Diagnostics.Process.Start(tempFile);
}
}));
}
}
private void button1_Click(object sender, EventArgs e)
{
newImageInstalled = false;
pictureBox1.ImageLocation =
"https://www.google.com/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png";
}
private void button2_Click(object sender, EventArgs e)
{
newImageInstalled = false;
pictureBox1.Image = null;
}

Image move on button click

I want move an image in one picture box to another and vice versa on a button click, I'm pretty sure my code should work in theory, but it just won't execute for some reason. Any help would be much appreciated please!!
Here's my code:
int chicken_move = 0;
private void button_Chicken_Click(object sender, EventArgs e)
{
chicken_move++;
if (chicken_move > 1)
{
chicken_move = 0;
}
switch (chicken_move)
{
case 0:
pictureBox_Micro.Image = pictureBox_Uncooked.Image;
pictureBox_Uncooked.Image = null;
break;
case 1:
pictureBox_Uncooked.Image = pictureBox_Micro.Image;
pictureBox_Micro.Image = null;
break;
}

You need to use swap technique to change picture. Otherwise, you will lost it after first click.
public partial class Form1 : Form
{
private bool isFirstOne;
Image forSwap;
public Form1()
{
InitializeComponent();
string path1 = #"C:\Users\...\...\somePic.png";
pictureBox1.Image = Image.FromFile(path1);
forSwap = null;
isFirstOne = false;
}
private void button1_Click(object sender, EventArgs e)
{
switch (isFirstOne)
{
case true:
forSwap = pictureBox2.Image;
pictureBox1.Image = pictureBox2.Image;
pictureBox2.Image = null;
break;
case false:
forSwap = pictureBox1.Image;
pictureBox2.Image = pictureBox1.Image;
pictureBox1.Image = null;
break;
}
isFirstOne = !isFirstOne;
}
}

Try not setting the Image of one pictureBox to the Image of the other.
Try setting the Image to a reference to the actual image (file, etc.).
Or try using pictureBox.ImageLocation to set it.

Considering you set the chicken_move variable as global, there is nothing wrong
with the code. Try providing image file location:
pictureBox_Micro.ImageLocation = "UncookedImage.jpg";
pictureBox_Uncooked.ImageLocation = "MicroImage.jpg";

C# - How to save a string entered in Form2 in Form1

I get the default path from the registry for the Steam installation. But if someone has their games installed to a different folder, the user has to enter it in the Configure form. When the form gets closed, that path entered(from the folder browser or by typing the path in manually) should get saved to a string in the main form and should enable a different Combobox which turns on different buttons. I somehow managed to do the save to the mainform string, but the 2nd combobox doesn't seem to turn on. How can I do it correctly?
** MAIN FORM **
public string NewPath { get; set; }
private ConfigForm otherForm;
string InstallPath = (string)Registry.GetValue(#"HKEY_CURRENT_USER\SOFTWARE\Valve\Steam", "SteamPath", null);
private void PortalHammerButton_Click(object sender, EventArgs e)
{
Process.Start(InstallPath + #"\SteamApps\common\Portal\bin\hammer.exe");
}
private void Gamedropdown_SelectedIndexChanged(object sender, EventArgs e)
{
if (Gamedropdown.Text == "Portal") // When Portal is selected
{
// Enable the Portal SDK buttons
PortalHammerButton.Visible = true;
PortalModelViewerButton.Visible = true;
PortalFacePoserButton.Visible = true;
// Disable the CS:GO SDK buttons
csgoFacePoserButton.Visible = false;
csgoHammerButton.Visible = false;
csgoModelViewerButton.Visible = false;
}
else if (Gamedropdown.Text == "CS:GO") // When CS:GO is selected
{
// Disable Portal SDK buttons
PortalHammerButton.Visible = false;
PortalModelViewerButton.Visible = false;
PortalFacePoserButton.Visible = false;
// Enable CS:GO SDK buttons
csgoFacePoserButton.Visible = true;
csgoHammerButton.Visible = true;
csgoModelViewerButton.Visible = true;
}
}
private void ConfigureButton_Click(object sender, EventArgs e)
{
var configdialog = new ConfigForm();
configdialog.Show();
}
private void PortalDifferentHammerButton_Click(object sender, EventArgs e)
{
Process.Start(NewPath + #"\SteamApps\common\Portal\bin\hammer.exe");
}
private void NewDropDown_SelectedIndexChanged(object sender, EventArgs e)
{
if (NewDropDown.Text == "Portal") // When Portal is selected
{
// Enable the Portal SDK buttons
PortalDifferentHammerButton.Visible = true;
PortalDifferentModelViewerButton.Visible = true;
PortalDifferentFacePoserButton.Visible = true;
// Disable the CS:GO SDK buttons
DifferentCSGOFaceposerButton.Visible = false;
DifferentCSGOHammerButton.Visible = false;
DifferentCSGOModelViewerButton.Visible = false;
}
else if (NewDropDown.Text == "CS:GO") // When CS:GO is selected
{
// Disable the Portal SDK buttons
PortalDifferentFacePoserButton.Visible = false;
PortalDifferentHammerButton.Visible = false;
PortalDifferentModelViewerButton.Visible = false;
// Enable the CS:GO SDK buttons
DifferentCSGOModelViewerButton.Visible = true;
DifferentCSGOHammerButton.Visible = true;
DifferentCSGOFaceposerButton.Visible = true;
}
}
private void button1_Click(object sender, EventArgs e)
{
this.Close();
ConfigForm cfgfrm = new ConfigForm();
cfgfrm.Close();
}
}
}
**CONFIGURE FORM**
public partial class ConfigForm : Form
{
public ConfigForm()
{
InitializeComponent();
Form1 frm1 = new Form1();
frm1.NewPath = NewPathBox.Text;
}
public void DifferentFolderBrowseButton_Click(object sender, EventArgs e)
{
FolderBrowserDialog fbd = new FolderBrowserDialog();
DialogResult result = fbd.ShowDialog();
string newpath = fbd.SelectedPath;
NewPathBox.Text = newpath;
Form1 frm1 = new Form1();
frm1.NewPath = NewPathBox.Text;
}
public void CloseButton_Click(object sender, EventArgs e)
{
this.Hide();
Form1 frm1 = new Form1();
frm1.Gamedropdown.Visible = false;
frm1.NewDropDown.Visible = true;
}
}
}
Any help would be appriciated.

Look at your ConfigForm. Here's your problem:
public ConfigForm()
{
InitializeComponent();
Form1 frm1 = new Form1();
frm1.NewPath = NewPathBox.Text;
}
What you're doing on your Form1 (which I'm guessing is your Main form) is creating a new instance of your ConfigForm and showing it. What you're doing in your ConfigForm is creating a new main form and setting the NewPath = to the value entered on your config form. The problem is this new Form1 is NOT the Form1 that created the ConfigForm. The Form1 that created your config form is not the one getting updated by your code, some arbitrary new Form1 that you create is the one getting updated. This is why your code isn't working as you expected.
Here's the approach I would take. Add a NewPath variable to your ConfigForm just like you have in Form1. Then, add a FormClosing method to FormConfig. Do something like this:
private void ConfigForm_FormClosing(object sender, FormClosingEventArgs e)
{
NewPath = NewPathBox.Text;
}
Then, change your code on Form1 to this:
private void button1_Click(object sender, EventArgs e)
{
ConfigForm cfgfrm = new ConfigForm();
cfgfrm.ShowDialog();
this.NewPath = cfgfrm.NewPath;
}
What this code is doing is creating and showing a new ConfigForm on your Form1 when you click button1. Then, when your user closes the FormConfig, the form saves the textbox value to the NewPath variable on the FormConfig. Then, once the form is closed, the code on Form1 resumes. Form1 then looks at the NewPath value that was saved when the user closed the FormConfig. Form1 grabs this new NewPath value and puts it in its own NewPath variable.
EDIT
To show/hide comboboxes:
private void button1_Click(object sender, EventArgs e)
{
ConfigForm cfgfrm = new ConfigForm();
cfgfrm.ShowDialog();
this.NewPath = cfgfrm.NewPath;
Gamedropdown.Visible = false;
NewDropDown.Visible = true
}

I'm not sure why you are making the secondary form so complicated. You don't need a pointer to it after you use it and you should be closing instead of hiding. Try this:
class ConfigForm : Form
{
public string newPath = null;
public void CloseButton_Click(object sender, EventArgs e)
{
newPath = NewPathBox.Text;
}
public void CloseButton_Click(object sender, EventArgs e)
{
Close();
}
}
...and in your main form:
public partial class Form1 : Form
{
string steamPath = null; // set to starting path
private void ConfigureButton_Click(object sender, EventArgs e)
{
bool valueChanged = false;
using (ConfigForm form = new ConfigForm())
{
form.newPath = null;
form.ShowDialog();
if (form.newPath != null)
{
steamPath = form.newPath;
valueChanged = true;
}
}
if (valueChanged)
{
// here is where you would handle reloading and changing the ComboBoxes
}
}
}
This will more cleanly return the new string. Whatever you want to do as a result of having changed the path can be done after you have disposed of the config form (bringing it up with the "using" conditional automatically does the disposal for you)

Button Background Image Check?

Pls i have a problem with trying to check the background Image of a button. I want to delete the button if its image matches an Image in the Resource Folder. I have Tried
private void DeleteCard(Button btn)
{
if (btn.BackgroundImage.Equals( FunWaysInc.Properties.Resources.Card_1))
{
playersCards.Remove(Properties.Resources.Card_1);
MessageBox.Show(playersCards.Count.ToString());
}
else
{
MessageBox.Show("NO");
}
}
private void frmQuickSpark_Load(object sender, EventArgs e)
{
Button tstbtn = new Button();
tstbtn.BackgroundImage = Properties.Resources.Card_1;
DeleteCard(tstbtn);
}
but the message box displayed is the one that displays "NO"..
Pls what is happening????

when adding the button
button.Tag = "ToDelete";
then later
foreach (Button b in this.Controls.OfType<Button>())
{
if(b.Tag == "ToDelete")
{
//delete
}
}

Here what you have to do. You need to enumerate all your images and store pointer in Tag property of the button.
private Dictionary<string, Image> _table = new Dictionary<string, Image>();
private void frmQuickSpark_Load(object sender, EventArgs e)
{
_table.Add("Image1", Properties.Resources.Card_1);
_table.Add("Image2", Properties.Resources.Card_2);
Button btn = new Button();
SetButtonImage(btn);
DeleteCard(btn);
}
private void SetButtonImage(Button button)
{
button.BackgroundImage = _table["Image1"];
button.BackgroundImage.Tag = "Image1";
}
private void DeleteCard(Button btn)
{
if (btn.BackgroundImage.Tag == "Image1")
{
playersCards.Remove(btn); // not sure what your logic of removal
MessageBox.Show(playersCards.Count.ToString());
}
else
{
MessageBox.Show("NO");
}
}

I already found an answer to my question.. I just modified my code
private void DeleteCard(Image img)
{
playersCards.Add(Properties.Resources.Card_1);
if (img == playersCards[0])
{
playersCards.Remove(Properties.Resources.Card_1);
MessageBox.Show(playersCards.Count.ToString());
}
else
{
MessageBox.Show("NO");
}
}
private void frmQuickSpark_Load(object sender, EventArgs e)
{
Button tstbtn = new Button();
tstbtn.BackgroundImage = Properties.Resources.Card_1;
Image img = tstbtn.BackgroundImage;
DeleteCard(img);
}
It works perfectly.

Creating a new form, switching focus between the new and the old form with a button

I have a form and I want to get an instance of the same form as stated in the code below. And I have a button: every time I press this button, if a new form is created, I want it to focus to that window, if not, I want to create a new form.
I managed to create a new form but if I want to focus on it, the code did not work, any ideas?
private void btn_Click(object sender, EventArgs e)
{
if (opened == false)
{
Text = "form1";
var form = new myformapp();
form.Show();
opened = true;
form.Text = "form2";
}
else
{
if (Application.OpenForms[1].Focused)
{
Application.OpenForms[0].BringToFront();
Application.OpenForms[0].Focus();
}
if (Application.OpenForms[0].Focused)
{
Application.OpenForms[1].BringToFront();
Application.OpenForms[1].Focus();
}
}
}

You can try shortening your code without the need to introduce more variables with this example:
void button1_Click(object sender, EventArgs e) {
bool found = false;
for (int i = 0; i < Application.OpenForms.Count; ++i) {
if (Application.OpenForms[i].GetType() == typeof(myformapp) &&
Application.OpenForms[i] != this) {
Application.OpenForms[i].Select();
found = true;
}
}
if (!found) {
myformapp form = new myformapp();
form.Show();
}
}
Updated code from Francesco Baruchelli's comment.

If I understand correctly what you are trying to do, you can keep a static List with the opened forms. Everytime an instance of your Form is opened you add it to the List, and everytime it is closed you remove it. The when you press the button you can check the size of the List. If it is 1 you create a new Form, open it and set the focus on it. If the size is already 2, you look in the List for the instance which is different from the one executing the click event. The code could be something like this:
private static List<Form1> openForms = new List<Form1>();
private void button1_Click(object sender, EventArgs e)
{
Form1 frm = null;
if (openForms.Count == 2)
{
foreach (Form1 aForm in openForms)
if (aForm != this)
{
frm = aForm;
break;
}
}
else
{
frm = new Form1();
frm.Show();
}
frm.Focus();
}
private void Form1_Load(object sender, EventArgs e)
{
openForms.Add(this);
}
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
openForms.Remove(this);
}