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Writing to memory in .NET and pick up data of process in labview


Writing to memory in .NET and pick up data of process in labview

By : Programer_Serbia
Date : November 17 2020, 11:55 AM
this one helps. Are those 2 separate processes? (2 separate exes). If so, you are not going to be able to share memory via direct allocation due to Process Isolation (1 process cannot see another process's memory).
Assuming that your answer is "yes" (2 separate processes), consider using Named Pipes to communicate cross process (or wrap it up with WCF)
code :

        public byte[] SerializeVectors(Vector3DF[][] vectors)
        {
            var formatter = new BinaryFormatter();
            // note: if you are using a stream to write to the memory mapped file, 
            // you could pass it in instead of using this memory stream as an intermediary
            using (var stream = new MemoryStream())
            {
                formatter.Serialize(stream, vectors);
                return stream.ToArray();
            }
        }

        public Vector3DF[][] DeserializeVectors(byte[] vectorBuffer)
        {
            var formatter = new BinaryFormatter();
            using (var stream = new MemoryStream(vectorBuffer, false))
            {
                return (Vector3DF[][])formatter.Deserialize(stream);
            }
        }


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C++/LabVIEW interop: error extracting data from LabVIEW array/ unexpected type conversion in function parameter

C++/LabVIEW interop: error extracting data from LabVIEW array/ unexpected type conversion in function parameter


By : chandrakanth
Date : March 29 2020, 07:55 AM
seems to work fine I'm using Cluebat-man's LabVIEW-C++ array interoperability class, and I'm getting an error extracting the data from from the array. Or, rather, the data extraction appears to succeed, but build fails when I try to use the data a line later. , I'm guessing the error is on this line:
code :
hueImageData = getHuePlane(LvImageData, width, height);
calcValue = int(double(HSLimage[x][y]) / 65536); //A-H-S-L; removes S-L
Writing memory of the traced process.

Writing memory of the traced process.


By : Gianlu
Date : March 29 2020, 07:55 AM
I wish this helpful for you You are opening the file in read-only mode (O_RDONLY). I'd suggest trying again with O_RDWR instead:
code :
  mem_fd = open(mem_file_name, O_RDWR);
   /proc/[pid]/mem
          This  file can be used to access the pages of a process's memory
          through open(2), read(2), and lseek(2).
#include <sys/ptrace.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

#define SHOW(call) ({ int _ret = (int)(call); printf("%s -> %d\n", #call, _ret); if (_ret < 0) { perror(NULL); }})

char changeme[] = "This is  a test";

int main (void)
{
  pid_t pid = fork();
  int ret;
  int i;
  union {
    char cdata[8];
    int64_t data;
  } u = { "Hijacked" };

  switch (pid) {
  case 0: /* child */
    sleep(1);
    printf("Message: %s\n", changeme);
    exit(0);

  case -1:
    perror("fork");
    exit(1);
    break;

  default: /* parent */
    SHOW(ptrace(PTRACE_ATTACH, pid, 0, 0));
    SHOW(ptrace(PTRACE_POKEDATA, pid, changeme, u.data));
    SHOW(ptrace(PTRACE_CONT, pid, 0, 0));
    wait(NULL);
    break;
  }

  return 0;
}
LabView: How to add a memory to a VI in labview?

LabView: How to add a memory to a VI in labview?


By : Falc0n
Date : March 29 2020, 07:55 AM
hope this fix your issue You can use a local variable and a feedback node to accomplish this.
Assuming this is in a while loop my solution is to create a local variable hasLit and a feedback node on the sensor input. When the feedback node output is true and the sensor input is false (the object just passed out of the sensor view) we change hasLit to true. The state of the light will then be true if the sensor is true and not hasLit.
I wanna read data from my binary file after the writing process complete and also read data without the writing process

I wanna read data from my binary file after the writing process complete and also read data without the writing process


By : Durga Prasad
Date : March 29 2020, 07:55 AM
To fix this issue Here is my part of the code from binary file writing. here I'm passing a 2d vector table that contains text format data or binary data. if the main table contains binary data I wanna read and load that data into one vector table. I already done that if the data is text file I can load that data from that file, but it's a binary data I don't know how can I load. I am also using index table. That means that table contains size of the each field in main table. , You made a mistake in your writing code
code :
fs.write(reinterpret_cast<char*> (&len),len);
fs.write(reinterpret_cast<char*>(&len), sizeof len);
vector<char> temp;
fs.read(reinterpret_cast<char*>(&len), sizeof len);
if (len > 0)
{
    temp.resize(len);
    fs.read(&temp[0], len);
}
mainTbl[i].at(j) = string(temp.begin(), temp.end());
How to process sensor data in LabVIEW? Every value is 255

How to process sensor data in LabVIEW? Every value is 255


By : Seba
Date : October 08 2020, 06:00 AM
will help you Quoting from Joe Friedrichsen in his comment: The express block that resets the sensor is not guaranteed to precede the loop because there is no data flow between them. The LabVIEW runtime can see two independent and parallel groups and may choose to execute them simultaneously (which on the wire might mean reset comes between loop commands) or in "reverse" order. Add a wire from reset block to create a terminal on the loop.
Here's a picture of the fix.
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