How can I load an image in C#
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Hi at all. I made a program which is able to modify images. Now I want it like this: You choose an image in your explorer, click the right button of your mouse and click "open with" and select my program, which I called PhotoClient. Ok, so the PhotoClient is starting but the selected image is not in the picturebox1 of my PhotoClient. So how can I make this come true that I can load an image like this ?
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Hi at all. I made a program which is able to modify images. Now I want it like this: You choose an image in your explorer, click the right button of your mouse and click "open with" and select my program, which I called PhotoClient. Ok, so the PhotoClient is starting but the selected image is not in the picturebox1 of my PhotoClient. So how can I make this come true that I can load an image like this ?
The file path to the image file will be passed to your program's arguments inside your main method. Inside Program.cs, you probably have a method like this:
static void Main()
{
...
}Change that to
static void Main(string[] arguments)
{
...
}When your app is launched, look at the arguments parameter. It should contain the file path to the image that Windows Explorer passed to you.
Tech, life, family, faith: Give me a visit. I'm currently blogging about: The Lord Is So Good The apostle Paul, modernly speaking: Epistles of Paul Judah Himango
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The file path to the image file will be passed to your program's arguments inside your main method. Inside Program.cs, you probably have a method like this:
static void Main()
{
...
}Change that to
static void Main(string[] arguments)
{
...
}When your app is launched, look at the arguments parameter. It should contain the file path to the image that Windows Explorer passed to you.
Tech, life, family, faith: Give me a visit. I'm currently blogging about: The Lord Is So Good The apostle Paul, modernly speaking: Epistles of Paul Judah Himango
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Thanks for your help. I put the "string[] arguments" in the Main, and now ? What do you mean with "look at the arguments" ? How can I transfer the file path into my Form1 ?
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Change the default constructor to take a string array, then change the line "new Form1();" to "new Form1(arguments);". Then in your constructor, use a foreach to try and open the files specified. Jeff
sorry Jeff, I do not really understand, I am new in C#. So, this is my Program.CS using System; using System.Collections.Generic; using System.Windows.Forms; namespace PhotoClient { static class Program { /// /// Der Haupteinstiegspunkt für die Anwendung. /// [STAThread] static void Main(string[] arguments) { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); } } } And here comes the Form1 // Photo Client 20 // using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.IO; using System.Drawing.Imaging; namespace PhotoClient { public partial class Form1 : Form { string[] arguments; public Form1() { InitializeComponent(); } #region variables Bitmap original_image, rot_image, carry, image; bool fill = false; string extension = ""; float resize = 1; OpenFileDialog load = new OpenFileDialog(); BrightnessAdjuster ba = new BrightnessAdjuster(); Rotation rt = new Rotation(); Draw dr = new Draw(); Save_percent sav = new Save_percent(); #endregion variables #region load n initialize private void load_Click(object sender, EventArgs e) { load.Filter = " jpg files (*.jpg)|*.jpg| All files (*.*)|*.*| bmp files (*.bmp)|*.bmp| gif files (*.gif)|*.gif "; if (load.ShowDialog() == DialogResult.OK) { initialize(); } } public void initialize() { image = new Bitmap(load.FileName); FileInfo original = new FileInfo(load.FileName); extension = original.Name; trackBar1.Maximum = image.Width; trackBar2.Maximum = image.Width; ... ... ... So what is a "constructor" ?
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sorry Jeff, I do not really understand, I am new in C#. So, this is my Program.CS using System; using System.Collections.Generic; using System.Windows.Forms; namespace PhotoClient { static class Program { /// /// Der Haupteinstiegspunkt für die Anwendung. /// [STAThread] static void Main(string[] arguments) { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); } } } And here comes the Form1 // Photo Client 20 // using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.IO; using System.Drawing.Imaging; namespace PhotoClient { public partial class Form1 : Form { string[] arguments; public Form1() { InitializeComponent(); } #region variables Bitmap original_image, rot_image, carry, image; bool fill = false; string extension = ""; float resize = 1; OpenFileDialog load = new OpenFileDialog(); BrightnessAdjuster ba = new BrightnessAdjuster(); Rotation rt = new Rotation(); Draw dr = new Draw(); Save_percent sav = new Save_percent(); #endregion variables #region load n initialize private void load_Click(object sender, EventArgs e) { load.Filter = " jpg files (*.jpg)|*.jpg| All files (*.*)|*.*| bmp files (*.bmp)|*.bmp| gif files (*.gif)|*.gif "; if (load.ShowDialog() == DialogResult.OK) { initialize(); } } public void initialize() { image = new Bitmap(load.FileName); FileInfo original = new FileInfo(load.FileName); extension = original.Name; trackBar1.Maximum = image.Width; trackBar2.Maximum = image.Width; ... ... ... So what is a "constructor" ?
Apoll The contructor is run when the a class is instantiated. A constructor has the same name as the class. In your code the constructor is
public Form1(){ InitializeComponent(); }What you will want to do is pass in the file name from the arguments list into this constructor. Modify the constructor to accept the path as a string like so:public Form1(string ImagePath){ InitializeComponent(); }Then in the main method pass the path to the new form like so:static void Main(string[] arguments) { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1(arguments[0])); }I have assumed that the path is stored as the first item in the array. You can then call the initialize method and pass in the path to the file (you will of course have to modify your initialize method to accept the file path as a parameter. Hope this helps. :) -
Apoll The contructor is run when the a class is instantiated. A constructor has the same name as the class. In your code the constructor is
public Form1(){ InitializeComponent(); }What you will want to do is pass in the file name from the arguments list into this constructor. Modify the constructor to accept the path as a string like so:public Form1(string ImagePath){ InitializeComponent(); }Then in the main method pass the path to the new form like so:static void Main(string[] arguments) { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1(arguments[0])); }I have assumed that the path is stored as the first item in the array. You can then call the initialize method and pass in the path to the file (you will of course have to modify your initialize method to accept the file path as a parameter. Hope this helps. :) -
Be careful with that, because it REQUIRES at least one argument, and ignores all others. If you want to be able to run from the command line OR open the application through explorer, you need to either... 1. Send the entire argument array into the constructor, or 2. Put an if, else in your static main method to determine whether to call the initializer with parameters or without If you only want this to run when you double click a file (or specify a file at the command line) then ignore this post. Jeff
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Be careful with that, because it REQUIRES at least one argument, and ignores all others. If you want to be able to run from the command line OR open the application through explorer, you need to either... 1. Send the entire argument array into the constructor, or 2. Put an if, else in your static main method to determine whether to call the initializer with parameters or without If you only want this to run when you double click a file (or specify a file at the command line) then ignore this post. Jeff
oh, yeprs, this is exactly my problem now. The thing is, when I make it with if else like this: public partial class Form1 : Form { Bitmap original_image; string path; public Form1(string[] ImagePath) { InitializeComponent(); if (ImagePath[0] != null) { path = ImagePath[0]; original_image = new Bitmap(path); pictureBox1.Image = original_image; } } it says that "if (ImagePath[0] != null)" is outside the bounds of the array
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oh, yeprs, this is exactly my problem now. The thing is, when I make it with if else like this: public partial class Form1 : Form { Bitmap original_image; string path; public Form1(string[] ImagePath) { InitializeComponent(); if (ImagePath[0] != null) { path = ImagePath[0]; original_image = new Bitmap(path); pictureBox1.Image = original_image; } } it says that "if (ImagePath[0] != null)" is outside the bounds of the array
Just do this... static class Program { [STAThread] static void Main(string[] arguments) { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1(arguments)); } } public partial class Form1 : Form { Bitmap m_Img null; public Form1(string[] arguments) { InitializeComponent(); if (arguments != null) { foreach (string filePath in arguments) { if (File.Exists(filePath)) { try { m_Img = new Bitmap(filePath); } catch { // Do something if error reading file as bitmap } } } } } } Jeff
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Just do this... static class Program { [STAThread] static void Main(string[] arguments) { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1(arguments)); } } public partial class Form1 : Form { Bitmap m_Img null; public Form1(string[] arguments) { InitializeComponent(); if (arguments != null) { foreach (string filePath in arguments) { if (File.Exists(filePath)) { try { m_Img = new Bitmap(filePath); } catch { // Do something if error reading file as bitmap } } } } } } Jeff