C# Argument 'picture' must be a picture that can be used as an Icon

Question

I am having trouble importing an icon into my application. I have a main form and I am trying to import to it a new icon via the Icon field in Properties.

The image is already in .ico format: this is the link to the icon I'm trying to use.

Does anyone know why Microsoft Visual Studio would be displaying this error?

Any help would be great.

Solution 1

After a second restart and then opening and re-saving the .ico myself in Gimp, then I was able to import it without any errors. Not too sure what caused this problem but it was just a freak error.

Solution 2

I had this error recently. Some recommendations:

• make sure the icon is square (16x16, 32x32)
• try saving it to a PNG and using this free service for conversion : http://www.convertico.com/

Solution 3

We have an application that works fine on 99% of our computers, but in one laptop it pops out this error.

It looks like our issue is that the laptop user set the screen text/image size to 150%. This could cause otherwise working images no longer working. We will see whether this works.

UPDATE

A commenter seems to have the same problem. And yes, we resolved this problem by setting the screen text size to less than 150%.

Solution 4

Credits to Xiaohuan ZHOU for the answer in this question. This function losslessly converts PNG (including transparency) to .ICO file format.

public void ConvertToIco(Image img, string file, int size)
{
    Icon icon;
    using (var msImg = new MemoryStream())
    using (var msIco = new MemoryStream())
    {
        img.Save(msImg, ImageFormat.Png);
        using (var bw = new BinaryWriter(msIco))
        {
            bw.Write((short)0);           //0-1 reserved
            bw.Write((short)1);           //2-3 image type, 1 = icon, 2 = cursor
            bw.Write((short)1);           //4-5 number of images
            bw.Write((byte)size);         //6 image width
            bw.Write((byte)size);         //7 image height
            bw.Write((byte)0);            //8 number of colors
            bw.Write((byte)0);            //9 reserved
            bw.Write((short)0);           //10-11 color planes
            bw.Write((short)32);          //12-13 bits per pixel
            bw.Write((int)msImg.Length);  //14-17 size of image data
            bw.Write(22);                 //18-21 offset of image data
            bw.Write(msImg.ToArray());    // write image data
            bw.Flush();
            bw.Seek(0, SeekOrigin.Begin);
            icon = new Icon(msIco);
        }
    }
    using (var fs = new FileStream(file, FileMode.Create, FileAccess.Write))
    {
        icon.Save(fs);
    }
}

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Comments

[Charanraj Golla]

I used convertico to convert a png to ico but was still getting this error. Tried with a different icon and it worked.

[mbomb007]

No restart required for me. Simply open then save with Gimp.

[donutguy640]

restart had no effect here either, but saving in Gimp did it.

[Stefan Đorđević]

The error occurs if the .ICO file is corrupted, which may happen if, for example, apple.png is renamed to apple.ico. Therefore, it's not a valid .ICO file. Converters like the one you mentioned solve the problem because they don't change file format but convert it instead.

[Tim]

The code from the creation of icon and later can simply be replaced with File.WriteAllBytes(file, msIco.ToArray());. I basically did that, and was lazy and just dumped this into some code I was already working on. Note: I also instantiated bw slightly differently: using (var bw = new BinaryWriter(msIco, Encoding.ASCII, true)), because I was getting nulls elsewhere, but that may be specific to my code I spliced this into: the true at the end keeps the stream open when the binary writer disposes. Either way, this is helpful code, good reference.

[Tim]

msImg can also just be a byte array of a 32x32 pixel PNG and this still works.