byte

Send image from memory

由 半城伤御伤魂 提交于 2020-05-15 07:45:59
问题 I am trying to implement a system for a Discord bot that dynamically modifies images and sends them to the bot users. To do that, I decided to use the Pillow (PIL) library, since it seemed simple and straightforward for my purposes. Here is an example of my working code. It loads an example image, as a test modification, draws two diagonal lines on it, and outputs the image as a Discord message: # Open source image img = Image.open('example_image.png') # Modify image draw = ImageDraw.Draw(img

Send image from memory

由 試著忘記壹切 提交于 2020-05-15 07:45:03
问题 I am trying to implement a system for a Discord bot that dynamically modifies images and sends them to the bot users. To do that, I decided to use the Pillow (PIL) library, since it seemed simple and straightforward for my purposes. Here is an example of my working code. It loads an example image, as a test modification, draws two diagonal lines on it, and outputs the image as a Discord message: # Open source image img = Image.open('example_image.png') # Modify image draw = ImageDraw.Draw(img

Char size 8 bit or 16 bit?

由 ≯℡__Kan透↙ 提交于 2020-05-11 04:13:06
问题 http://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html, char size is 16 bit i.e 2 byte. somehow i recalled its 8 bit i.e 1 byte. To clear my doubt, i created a text file with single character "a" and saved it. Then i inspected the size of file , its 1 byte i.e 8 bit. I am confused whats the size of character ? If its 2 byte , why file size is 1 byte and if it is 1 byte why link says 2 bytes? 回答1: A char in Java is a UTF-16 code unit. It's not necessarily a complete Unicode

How to map and collect primitive return type using Java 8 Stream

由 亡梦爱人 提交于 2020-05-10 20:08:20
问题 I am new in Java 8 streams and I am wondering if there is way to perform forEach/map call on method returning a byte and accepting an int as parameter. Example: public class Test { private byte[] byteArray; // example of byte array public byte getByte(int index) { return this.byteArray[index]; } public byte[] getBytes(int... indexes) { return Stream.of(indexes) .map(this::getByte) // should return byte .collect(byte[]::new); // should return byte[] } } As you may guess, the getBytes method

How to map and collect primitive return type using Java 8 Stream

由 六月ゝ 毕业季﹏ 提交于 2020-05-10 20:07:11
问题 I am new in Java 8 streams and I am wondering if there is way to perform forEach/map call on method returning a byte and accepting an int as parameter. Example: public class Test { private byte[] byteArray; // example of byte array public byte getByte(int index) { return this.byteArray[index]; } public byte[] getBytes(int... indexes) { return Stream.of(indexes) .map(this::getByte) // should return byte .collect(byte[]::new); // should return byte[] } } As you may guess, the getBytes method

C# how to get Byte[] from IntPtr

由 家住魔仙堡 提交于 2020-05-09 19:23:31
问题 I have a .dll(not my own) that has a delegate. This delegate Callback function is: "CallBackFN(ushort opCOde, IntPtr payload , uint size, uint localIP)" How can i convert IntPtr to Byte[]? I think that payload is actually Byte[]. If it's not Byte[] and it's something else would i lose some data? 回答1: Have you looked into Marshal.Copy? http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.marshal.copy.aspx 回答2: If it's a byte[] array: byte[] managedArray = new byte[size];

Why is 1 Byte equal to 8 Bits? [closed]

由 烂漫一生 提交于 2020-05-08 03:43:10
问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 3 years ago . Why not 4 bits, or 16 bits? I assume some hardware-related reasons and I'd like to know how 8bit 1byte became the standard. 回答1: I'ts been a minute since I took computer organization, but the relevant wiki on 'Byte' gives some context. The byte was originally the smallest

Why is 1 Byte equal to 8 Bits? [closed]

由 时光怂恿深爱的人放手 提交于 2020-05-08 03:42:05
问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 3 years ago . Why not 4 bits, or 16 bits? I assume some hardware-related reasons and I'd like to know how 8bit 1byte became the standard. 回答1: I'ts been a minute since I took computer organization, but the relevant wiki on 'Byte' gives some context. The byte was originally the smallest

JNI中jstring 与 const char* 相互转换函数

由 旧巷老猫 提交于 2020-05-06 09:49:12
在平时的工作，经常用到jni和const类型转换。 //将const char类型转换成jstring类型 jstring CStr2Jstring( JNIEnv* env, const char* pat ) { //定义java String类 strClass jclass strClass = (env)->FindClass("Ljava/lang/String;"); //获取java String类方法String(byte[],String)的构造器,用于将本地byte[]数组转换为一个新String jmethodID ctorID = (env)->GetMethodID(strClass, "<init>", "([BLjava/lang/String;)V"); //建立byte数组 jbyteArray bytes = (env)->NewByteArray((jsize)strlen(pat)); //将char* 转换为byte数组 (env)->SetByteArrayRegion(bytes, 0, (jsize)strlen(pat), (jbyte*)pat); //设置String, 保存语言类型,用于byte数组转换至String时的参数 jstring encoding = (env)->NewStringUTF("GB2312");

twisted Int16StringReceiver little endian byte order

由 雨燕双飞 提交于 2020-04-30 07:42:08
问题 I'm trying to use this class provided by twisted to frame my tcp stream. But the default format they have is in big endian byte order but I need to read in little endian. So I did: class Player(basic.Int16StringReceiver): structFormat = "<H" def stringReceived(self, packet): print ':'.join(x.encode('hex') for x in packet) But for some reason stringReceived seldom gets called. Both client and server is on the same machine and I am very sure the client did send the data. So why is
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