How can I print bytea data as a hexadecimal string in PostgreSQL / pgAdmin III?
Based on this answer, I found my solution to be SELECT encode(my_column::bytea, ‘hex’) FROM my_table;
hex
hexadecimal floating constant in C
0x0.3p10 is an example of a hexadecimal floating point literal, introduced in C99(1). The p separates the base number from the exponent. The 0x0.3 bit is called the significand part (whole with optional fraction) and the exponent is the power of two by which it is scaled. That particular value is calculated as 0.3 in … Read more
Converting hex color to RGB and vice-versa
In python: def hex_to_rgb(value): “””Return (red, green, blue) for the color given as #rrggbb.””” value = value.lstrip(‘#’) lv = len(value) return tuple(int(value[i:i + lv // 3], 16) for i in range(0, lv, lv // 3)) def rgb_to_hex(red, green, blue): “””Return color as #rrggbb for the given color values.””” return ‘#%02x%02x%02x’ % (red, green, blue) hex_to_rgb(“#ffffff”) … Read more
Literal Syntax For byte[] arrays using Hex notation..?
As the other answered already said, byte is a signed type in Java. The range is from -128 to 127 inclusive. So 0xff is equal to -0x01. You can use 0xff instead of -0x01 if you add a manual cast: byte[] rawbytes={0xa, 0x2, (byte) 0xff};
Use vim to search by hex code
Search (e.g. using /) for \%x1b. You can also type control characters, including escape, into the command line by preceding them with Ctrl–V. So type /, Ctrl-V, Esc, Enter.
Converting a hex string to a byte array
This implementation uses the built-in strtol function to handle the actual conversion from text to bytes, but will work for any even-length hex string. std::vector<char> HexToBytes(const std::string& hex) { std::vector<char> bytes; for (unsigned int i = 0; i < hex.length(); i += 2) { std::string byteString = hex.substr(i, 2); char byte = (char) strtol(byteString.c_str(), NULL, … Read more
What is the underlying type of a c++ enum?
The type of a C++ enum is the enum itself. Its range is rather arbitrary, but in practical terms, its underlying type is an int. It is implicitly cast to int wherever it’s used, though. C++11 changes This has changed since C++11, which introduced typed enums. An untyped enum now is defined as being at … Read more
How to convert hex string to Java string?
Using Hex in Apache Commons: String hexString = “fd00000aa8660b5b010006acdc0100000101000100010000”; byte[] bytes = Hex.decodeHex(hexString.toCharArray()); System.out.println(new String(bytes, “UTF-8”));
Python convert decimal to hex
What about this: hex(dec).split(‘x’)[-1] Example: >>> d = 30 >>> hex(d).split(‘x’)[-1] ‘1e’ By using -1 in the result of split(), this would work even if split returned a list of 1 element.
Convert int to hex with leading zeros
You can specify the minimum number of digits by appending the number of hex digits you want to the X format string. Since two hex digits correspond to one byte, your example with 4 bytes needs 8 hex digits. i.e. use i.ToString(“X8”). If you want lower case letters, use x instead of X. For example … Read more