Stack Overflow
Stack Overflow

Questions tagged [unsigned-char]

321 questions
0
votes
1 answer

C++ unsigned char *{varName}; -> C#

I have DLL written in C++. I need to use it in my C# code I am trying to make such object of C++ in C#: typedef struct { int width; int height; int stride; unsigned char *pixels;} FIS_Image; Does unsigned char *pixels; in C++ will be byte pixels;…
Komiljon Aliyev
  • 89
  • 1
  • 7
0
votes
1 answer

How do I convert an unsigned char buffer to a double in C++?

I am trying to convert an unsigned char buffer array into a double. Why does this not copy the bytes into the double as they are in the array? #include #include int main() { unsigned char buffer[8] = {63, 240, 0, 0, 0, 0,…
Dylan Meiners
  • 31
  • 6
0
votes
2 answers

Get length of unsigned char*

Hi i am trying to get the length of unsigned char*, it is a pointer to a array witch means i cant use sizeof. I cant cast it to char* then do strlen() either, seeing as it contains null bytes in the middel of the string. What other way is there to…
raketmus
  • 48
  • 6
0
votes
3 answers

How do I prevent this infinite loop

When I run the following code, sometimes it will exit successfully and sometimes it will enter an infinite loop if highestNum is equal to 255. I understand that this happens because of rollover when 255 gets incremented and becomes 0. I understand…
Jacob Walters
  • 77
  • 2
  • 7
0
votes
1 answer

why is 00000000 - 00000001 = 11111111 in C unsigned char data type?

I observed that, when a unsigned char variable stores the value 0 (000000002) and it gets decremented by 1 (000000012), the variable value turns into 255 (111111112), which is the highest value that a unsigned char variable can hold. My question is:…
samuel
  • 3
  • 3
0
votes
1 answer

reverse a string using pointers (have to use unsigned *char) in C

I am currently working on an assignment for Uni. The task is to reverse a string in a separate function. The function-name is given like that: void string_rev(unsigned char *str); My Solution looks like this: void string_rev(unsigned char *str){ …
Easymoney_
  • 13
  • 2
0
votes
2 answers

Convert a string to and unsigned char []

I currently have a Packet set up like so: struct Packet { unsigned short sequenceNumber; unsigned short length; unsigned char control; unsigned char ack; unsigned short crc; unsigned char data[]; Packet copy(const Packet&…
Jeff Schmitz
  • 1,087
  • 1
  • 13
  • 28
0
votes
2 answers

Change uint8_t* to char*?

I have an API which requests a char*, this is my API function: CANMessage(unsigned _id, const char* _data, char _len = 8) More information available here: https://os.mbed.com/docs/mbed-os/v5.11/mbed-os-api-doxy/classmbed_1_1_c_a_n_message.html I…
Eskey Eski
  • 97
  • 6
0
votes
2 answers

Print/store n bytes of u_char pointer in c?

I am trying to make a function to print/store the first n bytes of an u_char pointer. This is what I currently have (just trying to print the first value), but it doesn't work. void print_first_value(const u_char * p) { printf("%d", p[0]); } I…
Citut
  • 847
  • 2
  • 10
  • 25
0
votes
1 answer

Difference between unsigned short and unsigned char in LoRa communication

I am working on establishing a lora communication between a gateway (RPI3 + LoRa hat) and a node (RPi3 + LoRa hat). As I would like to establish the communication channel without TTN, I tried the following example to setup communication between the…
Tina S
  • 1
0
votes
1 answer

How to load strings into elements of BYTE* array (C++)

I have a program that takes the contents of a file and convert it into a hex. I would like to take those hex values and store them as elements of an unsigned char array I've called hexData. How would I go about this? I've tried converting the hex…
Shayon Shakoorzadeh
  • 13
  • 3
0
votes
1 answer

Convert unsigned char to string then again to unsigned char

I want to convert: A simple unsigned char [] to string Then again to unsigned char This is my code: // This is the original char unsigned char data[14] = { 0x68,0x65,0x6c,0x6c,0x6f,0x20,0x63,0x6f,0x6d,0x70,0x75,0x74,0x65,0x72, }; // This…
user9411840
0
votes
1 answer

Convert System::String^ into unsigned char*

I have a C++-Dll which I am calling from a C# project. In a function I need a string as a parameter and then convert it to an unsigned char*. I am using System.String^ to convert the C#-String to a C++-String. How can I convert the String^ to an…
User987123
  • 97
  • 1
  • 11
0
votes
4 answers

unsigned char pointer in C#?

In the middle of translating some code from C++ to C#, I found this, unsigned char *p = m_pRecvBuffer + 5; unsigned int noncelen1 = *p * 256 + p[1]; How do I translate this into C#? m_pRecvBuffer is a char-array, however I store it as a byte-array.
Viktor Elofsson
  • 1,581
  • 2
  • 13
  • 20
0
votes
1 answer

Convertion from ByteArray to unsigned char*

i'm in Qt and i dhave the following problem: I'm storing a fingerprint template from a embedded system, after sending a command thru ftp, my system get fingerprint from scan and save the template (as unsigned char*) i do know the size of the…
user8057102
1 2 3
…
21 22