Bitmap with nullexception argument save to memystream
I am trying to save my Bitmap to a MemoryStream - what is wrong with this code? Why does this give me reason?
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) to WordTest.FormTestWord.insertBarCodesToPDF (Bitmap Barcode)
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1 answer
I believe your problem is related to the type of image you are trying to store in the MemoryStream. According to this code project article: Dynamically generating icons (safe) , some ImageFormat types do not have the required encoder for the save function to be saved as that type.
I defined the following types 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 results:
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 that says that some ImageFormat types are read-only.
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