I am getting "Value cannot be null.\r\nParameter name: encoder" error while saving a Bitmap image using RawFormat.
Sample code:
class Program
{
static void Main(string[] args)
{
try
{
var image = new System.Drawing.Bitmap(500, 400);
var stream = new MemoryStream();
image.Save(stream, image.RawFormat);
}
catch (Exception exp)
{
Console.WriteLine(exp.ToString());
}
}
}
The RawFormat doesn't exist in the existing list of ImageEncoders as below code returns null.
var imageCodecInfo = ImageCodecInfo.GetImageEncoders().FirstOrDefault(codec => codec.FormatID == image.RawFormat.Guid);
Note: The image could be any type(JPEG, BMP, PNG) etc. Image.Save() should work on image.RawFormat.
RawFormat is not Bitmap type. If I Change image.RawFormat to ImageFormat.Bmp, the save operation succeeds.
Referred below links but found nothing for making it independent of image type.
Image.Save crashing: {"Value cannot be null.\r\nParameter name: encoder"}
Why is Image.Save(Stream, ImageFormat) throwing an exception?
Any suggestions are welcome.
If you load an image from disk, you can use image.RawFormat to save that image using its original format. However there is no encoder associated with an in-memory bitmap (which is what you are creating in this sample application), so you'll have to specify an image format yourself (ie. ImageFormat.Bmp).
You can use this and it will be fixed:
image.Save(stream,ImageFormat.Jpeg);
I have method like this,
public static void Base64ToImageAndSave(string rawData, string path)
{
string parsedData;
parsedData = rawData.Contains(',')
? rawData.Substring(rawData.IndexOf(',') + 1)
: rawData;
byte[] imageBytes = Convert.FromBase64String(parsedData);
using (MemoryStream memoryStream = new MemoryStream(imageBytes))
{
using (Image image = Image.FromStream(memoryStream))
{
image.Save(path, ImageFormat.Jpeg);
}
}
}
I send base64 parameter for save the picture as a jpeg file. But I have this error
A generic error occurred in GDI+
on this line,
image.Save(path, ImageFormat.Jpeg);
I use using for dispose, but still have error. How can i solve this problem? thanks.
For future reference:
If you are getting the same error , then we can say that you don't have a write permission on some directory.
For example, if you are trying to save the Image from the memory stream to the file system , you may get that error.
Make sure to add write permission in folder or for the network service account.
Hope this helps!
I'm trying to save my Bitmap to MemoryStream - what wrong in this code? Why it gets me argumentnullexception ??
private void insertBarCodesToPDF(Bitmap barcode)
{
.......
MemoryStream ms = new MemoryStream();
barcode.Save(ms, System.Drawing.Imaging.ImageFormat.MemoryBmp); //<----
byte [] qwe = ms.ToArray();
.......
}
UPD: StackTrace
System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams)
in WordTest.FormTestWord.insertBarCodesToPDF(Bitmap barcode)
I believe that your problem is related to the type of image you are trying to save to the MemoryStream as. According to this Code Project article: Dynamically Generating Icons (safely), some of the ImageFormat types do not have the necessary encoder to allow the Save function to save as that type.
I ran the following to determine which types did and didn't work:
System.Drawing.Bitmap b = new Bitmap(10, 10);
foreach (ImageFormat format in new ImageFormat[]{
ImageFormat.Bmp,
ImageFormat.Emf,
ImageFormat.Exif,
ImageFormat.Gif,
ImageFormat.Icon,
ImageFormat.Jpeg,
ImageFormat.MemoryBmp,
ImageFormat.Png,
ImageFormat.Tiff,
ImageFormat.Wmf})
{
Console.Write("Trying {0}:", format);
MemoryStream ms = new MemoryStream();
bool success = true;
try
{
b.Save(ms, format);
}
catch (Exception)
{
success = false;
}
Console.WriteLine("\t{0}", (success ? "works" : "fails"));
}
This gave the results of:
Trying Bmp: works
Trying Emf: fails
Trying Exif: fails
Trying Gif: works
Trying Icon: fails
Trying Jpeg: works
Trying MemoryBMP: fails
Trying Png: works
Trying Tiff: works
Trying Wmf: fails
There is a Microsoft KB Article which states that some of the ImageFormat types are read-only.
I am getting "Value cannot be null.\r\nParameter name: encoder" error while saving a Bitmap image using RawFormat.
Sample code:
class Program
{
static void Main(string[] args)
{
try
{
var image = new System.Drawing.Bitmap(500, 400);
var stream = new MemoryStream();
image.Save(stream, image.RawFormat);
}
catch (Exception exp)
{
Console.WriteLine(exp.ToString());
}
}
}
The RawFormat doesn't exist in the existing list of ImageEncoders as below code returns null.
var imageCodecInfo = ImageCodecInfo.GetImageEncoders().FirstOrDefault(codec => codec.FormatID == image.RawFormat.Guid);
Note: The image could be any type(JPEG, BMP, PNG) etc. Image.Save() should work on image.RawFormat.
RawFormat is not Bitmap type. If I Change image.RawFormat to ImageFormat.Bmp, the save operation succeeds.
Referred below links but found nothing for making it independent of image type.
Image.Save crashing: {"Value cannot be null.\r\nParameter name: encoder"}
Why is Image.Save(Stream, ImageFormat) throwing an exception?
Any suggestions are welcome.
If you load an image from disk, you can use image.RawFormat to save that image using its original format. However there is no encoder associated with an in-memory bitmap (which is what you are creating in this sample application), so you'll have to specify an image format yourself (ie. ImageFormat.Bmp).
You can use this and it will be fixed:
image.Save(stream,ImageFormat.Jpeg);
i've got some binary data which i want to save as an image. When i try to save the image, it throws an exception if the memory stream used to create the image, was closed before the save. The reason i do this is because i'm dynamically creating images and as such .. i need to use a memory stream.
this is the code:
[TestMethod]
public void TestMethod1()
{
// Grab the binary data.
byte[] data = File.ReadAllBytes("Chick.jpg");
// Read in the data but do not close, before using the stream.
Stream originalBinaryDataStream = new MemoryStream(data);
Bitmap image = new Bitmap(originalBinaryDataStream);
image.Save(#"c:\test.jpg");
originalBinaryDataStream.Dispose();
// Now lets use a nice dispose, etc...
Bitmap2 image2;
using (Stream originalBinaryDataStream2 = new MemoryStream(data))
{
image2 = new Bitmap(originalBinaryDataStream2);
}
image2.Save(#"C:\temp\pewpew.jpg"); // This throws the GDI+ exception.
}
Does anyone have any suggestions to how i could save an image with the stream closed? I cannot rely on the developers to remember to close the stream after the image is saved. In fact, the developer would have NO IDEA that the image was generated using a memory stream (because it happens in some other code, elsewhere).
I'm really confused :(
As it's a MemoryStream, you really don't need to close the stream - nothing bad will happen if you don't, although obviously it's good practice to dispose anything that's disposable anyway. (See this question for more on this.)
However, you should be disposing the Bitmap - and that will close the stream for you. Basically once you give the Bitmap constructor a stream, it "owns" the stream and you shouldn't close it. As the docs for that constructor say:
You must keep the stream open for the
lifetime of the Bitmap.
I can't find any docs promising to close the stream when you dispose the bitmap, but you should be able to verify that fairly easily.
A generic error occurred in GDI+.
May also result from incorrect save path!
Took me half a day to notice that.
So make sure that you have double checked the path to save the image as well.
Perhaps it is worth mentioning that if the C:\Temp directory does not exist, it will also throw this exception even if your stream is still existent.
Copy the Bitmap. You have to keep the stream open for the lifetime of the bitmap.
When drawing an image: System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI
public static Image ToImage(this byte[] bytes)
{
using (var stream = new MemoryStream(bytes))
using (var image = Image.FromStream(stream, false, true))
{
return new Bitmap(image);
}
}
[Test]
public void ShouldCreateImageThatCanBeSavedWithoutOpenStream()
{
var imageBytes = File.ReadAllBytes("bitmap.bmp");
var image = imageBytes.ToImage();
image.Save("output.bmp");
}
I had the same problem but actually the cause was that the application didn't have permission to save files on C. When I changed to "D:\.." the picture has been saved.
You can try to create another copy of bitmap:
using (var memoryStream = new MemoryStream())
{
// write to memory stream here
memoryStream.Position = 0;
using (var bitmap = new Bitmap(memoryStream))
{
var bitmap2 = new Bitmap(bitmap);
return bitmap2;
}
}
This error occurred to me when I was trying from Citrix. The image folder was set to C:\ in the server, for which I do not have privilege. Once the image folder was moved to a shared drive, the error was gone.
A generic error occurred in GDI+. It can occur because of image storing paths issues,I got this error because my storing path is too long, I fixed this by first storing the image in a shortest path and move it to the correct location with long path handling techniques.
I was getting this error, because the automated test I was executing, was trying to store snapshots into a folder that didn't exist. After I created the folder, the error resolved
One strange solution which made my code to work.
Open the image in paint and save it as a new file with same format(.jpg). Now try with this new file and it works. It clearly explains you that the file might be corrupted in someway.
This can help only if your code has every other bugs fixed
It has also appeared with me when I was trying to save an image into path
C:\Program Files (x86)\some_directory
and the .exe wasn't executed to run as administrator, I hope this may help someone who has same issue too.
For me the code below crashed with A generic error occurred in GDI+on the line which Saves to a MemoryStream. The code was running on a web server and I resolved it by stopping and starting the Application Pool that was running the site.
Must have been some internal error in GDI+
private static string GetThumbnailImageAsBase64String(string path)
{
if (path == null || !File.Exists(path))
{
var log = ContainerResolver.Container.GetInstance<ILog>();
log.Info($"No file was found at path: {path}");
return null;
}
var width = LibraryItemFileSettings.Instance.ThumbnailImageWidth;
using (var image = Image.FromFile(path))
{
using (var thumbnail = image.GetThumbnailImage(width, width * image.Height / image.Width, null, IntPtr.Zero))
{
using (var memoryStream = new MemoryStream())
{
thumbnail.Save(memoryStream, ImageFormat.Png); // <= crash here
var bytes = new byte[memoryStream.Length];
memoryStream.Position = 0;
memoryStream.Read(bytes, 0, bytes.Length);
return Convert.ToBase64String(bytes, 0, bytes.Length);
}
}
}
}
I came across this error when I was trying a simple image editing in a WPF app.
Setting an Image element's Source to the bitmap prevents file saving.
Even setting Source=null doesn't seem to release the file.
Now I just never use the image as the Source of Image element, so I can overwrite after editing!
EDIT
After hearing about the CacheOption property(Thanks to #Nyerguds) I found the solution:
So instead of using the Bitmap constructor I must set the Uri after setting CacheOption BitmapCacheOption.OnLoad.(Image1 below is the Wpf Image element)
Instead of
Image1.Source = new BitmapImage(new Uri(filepath));
Use:
var image = new BitmapImage();
image.BeginInit();
image.CreateOptions = BitmapCreateOptions.IgnoreImageCache;
image.CacheOption = BitmapCacheOption.OnLoad;
image.UriSource = new Uri(filepath);
image.EndInit();
Image1.Source = image;
See this: WPF Image Caching
Try this code:
static void Main(string[] args)
{
byte[] data = null;
string fullPath = #"c:\testimage.jpg";
using (MemoryStream ms = new MemoryStream())
using (Bitmap tmp = (Bitmap)Bitmap.FromFile(fullPath))
using (Bitmap bm = new Bitmap(tmp))
{
bm.SetResolution(96, 96);
using (EncoderParameters eps = new EncoderParameters(1))
{
eps.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
bm.Save(ms, GetEncoderInfo("image/jpeg"), eps);
}
data = ms.ToArray();
}
File.WriteAllBytes(fullPath, data);
}
private static ImageCodecInfo GetEncoderInfo(string mimeType)
{
ImageCodecInfo[] encoders = ImageCodecInfo.GetImageEncoders();
for (int j = 0; j < encoders.Length; ++j)
{
if (String.Equals(encoders[j].MimeType, mimeType, StringComparison.InvariantCultureIgnoreCase))
return encoders[j];
}
return null;
}
I used imageprocessor to resize images and one day I got "A generic error occurred in GDI+" exception.
After looked up a while I tried to recycle the application pool and bingo it works. So I note it here, hope it help ;)
Cheers
I was getting this error today on a server when the same code worked fine locally and on our DEV server but not on PRODUCTION. Rebooting the server resolved it.
public static byte[] SetImageToByte(Image img)
{
ImageConverter converter = new ImageConverter();
return (byte[])converter.ConvertTo(img, typeof(byte[]));
}
public static Bitmap SetByteToImage(byte[] blob)
{
MemoryStream mStream = new MemoryStream();
byte[] pData = blob;
mStream.Write(pData, 0, Convert.ToInt32(pData.Length));
Bitmap bm = new Bitmap(mStream, false);
mStream.Dispose();
return bm;
}