w2olves w2olves - 2 months ago 46
C# Question

Saving a base64 string as an image into a folder on server using C# and Web Api

I am posting a Base64 string via Ajax to my Web Api controller. Code below

Code for converting string to Image

public static Image Base64ToImage(string base64String)
{
// Convert base 64 string to byte[]
byte[] imageBytes = Convert.FromBase64String(base64String);
// Convert byte[] to Image
using (var ms = new MemoryStream(imageBytes, 0, imageBytes.Length))
{
Image image = Image.FromStream(ms, true);
return image;
}
}


Controller Code

public bool SaveImage(string ImgStr, string ImgName)
{
Image image = SAWHelpers.Base64ToImage(ImgStr);
String path = HttpContext.Current.Server.MapPath("~/ImageStorage"); //Path

//Check if directory exist
if (!System.IO.Directory.Exists(path))
{
System.IO.Directory.CreateDirectory(path); //Create directory if it doesn't exist
}

string imageName = ImgName + ".jpg";

//set the image path
string imgPath = Path.Combine(path, imageName);

image.Save(imgPath, System.Drawing.Imaging.ImageFormat.Jpeg);

return true;
}


This is always failing with a generic GDI+ error. What am I missing ? Is there a better way to save a specific string as an image on a folder ?

BWA BWA
Answer

In Base64 string You have all bytes of image. You don't need create Image object. All what you need is decode from Bese64 and save this bytes as file.

Example

public bool SaveImage(string ImgStr, string ImgName)
{       
    String path = HttpContext.Current.Server.MapPath("~/ImageStorage"); //Path

    //Check if directory exist
    if (!System.IO.Directory.Exists(path))
    {
        System.IO.Directory.CreateDirectory(path); //Create directory if it doesn't exist
    }

    string imageName = ImgName + ".jpg";

    //set the image path
    string imgPath = Path.Combine(path, imageName);

    byte[] imageBytes = Convert.FromBase64String(base64String);

    File.WriteAllBytes(imgPath, imageBytes);

    return true;
}