private string DecodeImage(Bitmap image)

Question

1.00/5 (2 votes)

See more:

Hello i am beginner in C#
iam learning some project how to creat an application that can convert text to image and vice versa. my problem is how to use this method. iam stuck :(

i use this method

C#

private string DecodeImage(Bitmap image)
{
    string Result = null;
    if (image.Height > 0)
    {
        if (image.Height == image.Width)
        {
            for (int y = 0; y < image.Height; y++)
            {
                for (int x = 0; x < image.Width; x++)
                {
                    int bite = (image.GetPixel(x, y).R + image.GetPixel(x, y).G + image.GetPixel(x, y).B);
                    if (bite == 0) break;
                    else Result += (char)bite;
                }
            }
        }
    }
    return Result;
}

and iam tried to decodeimage to show the message in my textbox, but i found error when debug.

C#

private void button5_Click(object sender, EventArgs e)
{
    textBox1.Text = DecodeImage(pictureBox1.Image);
}

how tocall the method , so we can decodeimage to my textbox 1?

error message :

Argument 1: cannot convert from 'System.Drawing.Image' to 'System.Drawing.Bitmap'

Posted 15-Aug-13 3:19am

Gun Gun Febrianza

Updated 15-Aug-13 4:03am

v2

Add a Solution

Comments

Sergey Alexandrovich Kryukov 15-Aug-13 9:24am

Look at the type diagram! And don't use PictureBox (explain why, however), don't use GetPixel (prohibitively slow).
—SA

Gun Gun Febrianza 15-Aug-13 9:30am

sir can you help me i will upload my project

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2013-08-15T03:56:00

It's pretty simple: A Bitmap is an Image, but an Image isn't a Bitmap. In the same way that an Apple is a Fruit, but a Fruit isn't an Apple.

Your method is set to take a single parameter, which it declared as a Bitmap. You are calling it and trying to pass an Image, so it is trying to promote the Image to a Bitmap and (quite correctly) says it cannot do that, because it "does not know how to cannot convert from 'System.Drawing.Image' to 'System.Drawing.Bitmap'" any more than you can take a generic Fruit hidden in a paper bag labeled "Fruit" and make it into an Apple. You can cast down the inheritance chain, but it takes an explicit cast to go up.

There are two ways you could cure this:
1) Change your method to accept an Image instead of a Bitmap as it's parameter - you can then pass it either perfectly happily.

C#

private string DecodeImage(Image image)

2) Change your calling code to provide a Bitmap instead of an Image, if necessary by explicitly casting it:

C#

textBox1.Text = DecodeImage((Bitmap) pictureBox1.Image);

In this case, you want the second option, since Bitmap has the GetPixel method, and Image doesn't.