As mentioned, MIME magic is the only way to do this. Many platforms provide up-to-date and robust MIME magic files and code to do this efficiently. The only way to do this in .NET without any 3rd party code is to use FindMimeFromData from urlmon.dll. Here’s how: public static int MimeSampleSize = 256; public static … Read more
Something like this: using System; public static class Parser { static void Main() { string hex = “0xBAC893CAB8B7FE03C927417A2A3F6A6” + “0BD30FF35E250011CB25507EBFCD5223B”; byte[] parsed = ParseHex(hex); // Just for confirmation… Console.WriteLine(BitConverter.ToString(parsed)); } public static byte[] ParseHex(string hex) { int offset = hex.StartsWith(“0x”) ? 2 : 0; if ((hex.Length % 2) != 0) { throw new ArgumentException(“Invalid length: … Read more
The following method can rotate a YUV420 byte array by 90 degree. private byte[] rotateYUV420Degree90(byte[] data, int imageWidth, int imageHeight) { byte [] yuv = new byte[imageWidth*imageHeight*3/2]; // Rotate the Y luma int i = 0; for(int x = 0;x < imageWidth;x++) { for(int y = imageHeight-1;y >= 0;y–) { yuv[i] = data[y*imageWidth+x]; i++; } … Read more
The problem here is that the imbedded image was not a simple BMP or JPEG. It was a Microsoft Word Picture and the OLE header information was considerably larger than the 300 byte window of the original GetImageBytesFromOLEField() code. (That is, after scanning 300 bytes it just gave up with “Unable to determine header size…”.) … Read more
Here is a good example of base64 encoding byte arrays. It gets more complicated when you throw unicode characters in the mix to send things like PDF documents. After encoding a byte array the encoded string can be used as a JSON property value. Apache commons offers good utilities: byte[] bytes = getByteArr(); String base64String … Read more
You can use copyPixelsToBuffer() to move the pixel data to a Buffer, or you can use getPixels() and then convert the integers to bytes with bit-shifting. copyPixelsToBuffer() is probably what you’ll want to use, so here is an example on how you can use it: //b is the Bitmap //calculate how many bytes our image … Read more
Simply replace the whole thing with: return File.ReadAllBytes(fileName); However, if you are concerned about the memory consumption, you should not read the whole file into memory all at once at all. You should do that in chunks.
I had a lot of problems with downloading and showing content of PDF, I probably wasted a day or two to fix it, so I’ll post working example of how to successfully download PDF or open it in new tab: myService.ts downloadPDF(): any { return this._http.get(url, { responseType: ResponseContentType.Blob }).map( (res) => { return new … Read more
public static byte[] serialize(Object obj) throws IOException { ByteArrayOutputStream out = new ByteArrayOutputStream(); ObjectOutputStream os = new ObjectOutputStream(out); os.writeObject(obj); return out.toByteArray(); } public static Object deserialize(byte[] data) throws IOException, ClassNotFoundException { ByteArrayInputStream in = new ByteArrayInputStream(data); ObjectInputStream is = new ObjectInputStream(in); return is.readObject(); }