I have one WPF application in which I am uploading autocad drawing files (.dwg), convert it to byte array and save to database. When I read back that file from byte array, I am getting following error :
No imaging component suitable to complete this operation was found.
My code to convert in byte array is below :
FileStream fs = new FileStream(dlg.FileName, FileMode.Open, FileAccess.Read);
byte[] data = new byte[fs.Length];
fs.Read(data, 0, System.Convert.ToInt32(fs.Length));
fs.Close();
I am trying to get image from byte array using below code :
BitmapImage bi = new BitmapImage();
bi.BeginInit();
bi.CreateOptions = BitmapCreateOptions.None;
bi.CacheOption = BitmapCacheOption.Default;
bi.StreamSource = new MemoryStream(data);
RenderOptions.SetBitmapScalingMode(bi, BitmapScalingMode.Linear);
bi.EndInit();
Above code works fine for other image files like jpg, png, bmp, gif. but not working for dwg file. Can anybody guide me what's wrong in my code ?
Thanks
Times ago I was searching for DWG library in C# and found this one:
http://www.woutware.com/cadlib.html, but after never used it.
You can not threat DWG files like ordinar image files, DWG is fairly complicated format for storing 2D and 3D data as well. And years ago also was a subject of frequent change and all licensing mess.
Hope this helps.
You have answered it yourself!
Above code works fine for other image files like jpg, png, bmp, gif.
but not working for dwg file.
For this to work correctly deserialise the byte array back to as "dwg file" itself and use some APIs to convert it to a bitmap and use that as the image source.
Try using a type converter
FileStream fs = new FileStream(dlg.FileName, FileMode.Open, FileAccess.Read);
byte[] data = new byte[fs.Length];
fs.Read(data, 0, System.Convert.ToInt32(fs.Length));
fs.Close();
TypeConverter tc = TypeDescriptor.GetConverter(typeof(BitmapImage));
BitmapImage bitmap1 = (BitmapImage)tc.ConvertFrom(data);
Try using strm.Seek(0, SeekOrigin.Begin); because it may be possible you must have gone past through the stream with read
One option is to use http://www.opendwg.org/
Although not free, it is non-profit.
But it will only parse the dwg file for you into collection of lines, circles, polygons etc.
You still need to piece together and render the image.
Related
I have uploaded a PDF file and I convert it to byte format and save it in the database. On fetching the PDF byte array, I need to convert them to image format so that I can insert the image into a new PDF report
SqlCommand objCmd = new SqlCommand(sTSQL, con);
objCmd.CommandType = CommandType.Text;
object result = objCmd.ExecuteScalar();
byte[] byteArray;
BinaryFormatter bf = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
bf.Serialize(ms, result);
byteArray = ms.ToArray(); // Byte Array
ms.Close();
ms = new MemoryStream(byteArray, 0, byteArray.Length);
ms.Seek(0, SeekOrigin.Begin);
System.Drawing.Image returnImage = System.Drawing.Image.FromStream(ms);`enter code here`
Error Statement : "Parameter is not valid"
The problem is the stream that you're trying to write to an image is the byte representation of an actual PDF, so that won't work.
You can use tools such as ImageMagick - that is a .NET wrapper for the library which will allow you to convert a PDF to image. That will actually figure out what the PDF looks like when rendered and will turn it into an image.
ImageMagick is a powerful image manipulation library that supports
over 100 major file formats (not including sub-formats). With
Magick.NET you can use ImageMagick without having to install
ImageMagick on your server or desktop. Visit
https://github.com/dlemstra/Magick.NET/tree/master/Documentation
before installing to help you decide the best version.
I have to create multiple thumbnails and save on amazon s3 in c#. I don't find library which can create thumbnail from memory stream only from source file. But can't have file source, I have only the stream from the upload and I don't want save localy the file.
Thx for ur help!
Simple c# code can do this for you. You can create a thumbnail from byte array.
First convert your memory stream object to byte array by following code
byte[] bytes = memoryStream.ToArray();
and then you can use below method
public byte[] MakeThumbnail(byte[] myImage, int thumbWidth, int thumbHeight)
{
using (MemoryStream ms = new MemoryStream())
using (Image thumbnail = Image.FromStream(new MemoryStream(myImage)).GetThumbnailImage(thumbWidth, thumbHeight, null, new IntPtr()))
{
thumbnail.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
return ms.ToArray();
}
}
I don't find library which can create thumbnail from memory stream only from
source file
Really? Because I do not need a library for that - I can do that with standard C#.
System.Drawing.Bitmap has a constructor accepting a stream.
But can't have file source,
Actually you can - it is called a temporary file and there is a whole mechanism for that in .NET (and windows). Really.
But it is not needed. Read the manual, create a bitmap (by packing your byte array into a MemoryStream) and it should work.
I have copied some data in Clipboard using MS-Word Com API
Range.CopyAsPicture();
and when I am pasting(Ctrl + v) it on window's paint software its getting displayed.
Issue is while converting Clipboard data to image Using c#
I looked into various link on internet and tried following code which is not working
MemoryStream ms = Clipboard.GetData("DeviceIndependentBitmap") as MemoryStream;
above line returning null
clipboardData.GetDataPresent(System.Windows.Forms.DataFormats.Bitmap)
Above line returning false
Can anyone please suggest how can convert the clipboard data to image.
If all you are looking for is getting the bitmap of the image in the clipboard (or the underlying binary data), look into using GetImage.
Here is a code snippet you can try:
BitmapSource bmpSource = Clipboard.GetImage();
MemoryStream ms = new MemoryStream();
BitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bmpSource));
encoder.Save(ms);
ms.Seek(0, SeekOrigin.Begin);
In case that also doesn't seem to work, you can try looking into this workaround, it doesn't seem directly related, but it might be just what you need.
Apparently MS Office puts images on the clipboard as a stream of PNG bytes, which is actually a really sensible innovation. This image data simply uses the identifier "PNG".
So try this instead:
if (retrievedData.GetDataPresent("PNG"))
{
MemoryStream png_stream = retrievedData.GetData("PNG") as MemoryStream;
if (png_stream != null)
return new Bitmap(png_stream);
}
I have an image in PNG or BMP format. I would like to find out the filesize of that image after compressing it to a jpeg without saving the jpeg.
Up to now I did it the following way:
frameNormal.Save("temp.jpg", ImageFormat.Jpeg);
tempFile = new FileInfo("temp.jpg");
filesizeJPG = tempFile.Length;
But because of the slow disk access, the program takes too long.
Is there a way to calculate the filesize of the newly created jpeg? Like converting the PNG in memory and read the size...
Any help is very much appreciated :-)
You can write the image data to a Stream instead of supplying a filename:
using (MemoryStream mem = new MemoryStream())
{
frameNormal.Save(mem, ImageFormat.Jpeg);
filesizeJPG = mem.Length;
}
You can to something like this:
MemoryStream tmpMs = new MemoryStream();
frameNormal.Save(tmpMs, ImageFormat.Jpeg);
long fileSize = tmpMs.Length;
Try loading it into memory without saving to disk. Look up MemoryStream.
Also, this answer might help: How to get the file size of a "System.Drawing.Image"
I have a functioning application in c#/.net that currently accepts raw image data in a bayer format from a set of embedded cameras and converts them to jpeg images. To save transmission time, I have modified the embedded devices to encode the images as jpegs prior to transmission. I'm an experienced embedded programmer but a total c#/.net noob. I have managed to modify the application to save the arrays to file with a jpeg name using this snippet: ( the offset of 5 is to skip header data in the transmission frame)
FileStream stream = File.Create(fileName);
BinaryWriter writer = new BinaryWriter(stream);
writer.Write(multiBuff.msgData, 5, multiBuff.dataSize - 5);
writer.Close();
The files open up fine, but now I want to treat the data as a bitmap without having to save & load from file. I tried the following on the data array:
MemoryStream stream = new MemoryStream(data);
BinaryReader reader = new BinaryReader(stream);
byte[] headerData = reader.ReadBytes(5);
Bitmap bmpImage = new Bitmap(stream);
But this throws a parameter not valid exception. As a newbie, I'm a little overwhelmed with all the classes and methods for images and it seems like what I'm doing should be commonplace, but I can't find any examples in the usual places. Any ideas?
I think you are looking for Bitmap.FromStream() :
Bitmap bmpImage = (Bitmap)Bitmap.FromStream(stream);
Actually using new Bitmap(stream) should have worked as well - this means that the data in the stream does not constitute a valid image - are you sure the jpg is valid? Can you save it to disk and open it i.e. in Paint to test?
You use the Image class.
Image image;
using (MemoryStream stream = new MemoryStream(data))
{
image = Image.FromStream(stream);
}
FYI it didn't work because reader.ReadBytes(5) returns the 5 first bytes of stream not the bytes after position 5