Hiding CMD window using C++

[Shammikit]

im writing a QT window application and im using popen to use CMD to run a command, get its output and display it. when running it open the cmd window for like a second  and goes out. the code works and i get my output in the label . I do not like seeing that cmd window pop up so i want to know if there's a method to hide the window when its running. Thank you

#include <iostream>
#include <stdexcept>
#include <stdio.h>
#include <string>

std::string exec(const char* cmd) {
    char buffer[128];
    std::string result = "";
    FILE* pipe = popen(cmd, "r");
    if (!pipe) throw std::runtime_error("popen() failed!");
    try {
        while (!feof(pipe)) {
            if (fgets(buffer, 128, pipe) != NULL)
                result += buffer;
        }
    } catch (...) {
        pclose(pipe);
        throw;
    }
    pclose(pipe);
    return result;
}

 

[WereCatf]

I believe you should use QProcess instead, it apparently shouldn't open up a window. Doesn't look like there's a way of stopping that from happening when using popen().

[Shammikit]

28 minutes ago, WereCatf said:

I believe you should use QProcess instead, it apparently shouldn't open up a window. Doesn't look like there's a way of stopping that from happening when using popen().

hello i have got Qprocess working and in my case im getting 2 lines as output.If im accessing the second output only, how can i achieve this. is there a way to remove the first line of output or is there a way to tell to read the 2nd line only?

[WereCatf]

14 minutes ago, Shammikit said:

hello i have got Qprocess working and in my case im getting 2 lines as output.If im accessing the second output only, how can i achieve this. is there a way to remove the first line of output or is there a way to tell to read the 2nd line only?

It'd help, if you showed the output you're getting. That said, there are multiple ways of skinning the cat, like e.g. using strchr() or strtok(). Here's a quick example of how to do it using strchr():
 

#include <stdio.h>
#include <string.h>

int main ()
{
  char multiString[] ="First line of text.\nSecond line of text.";
  char *singleString = NULL; //Always initialize pointers!
  singleString = strchr(multiString, '\n'); //Look for newline-character
  if(singleString != NULL) singleString++; //Skip the newline-character
  if(strlen(singleString)) printf("Output: %s\n", singleString);
  return 0;
}

This example will produce:

Quote

Output: Second line of text.

 

[WereCatf]

Here's a link that may help you, if you want to do it using Qt-functions: https://stackoverflow.com/questions/36624730/how-to-split-qstring

 

I don't use Qt, so I can't really help with Qt-functionality.

[Shammikit]

14 minutes ago, WereCatf said:

It'd help, if you showed the output you're getting. That said, there are multiple ways of skinning the cat, like e.g. using strchr() or strtok(). Here's a quick example of how to do it using strchr():
 

#include <stdio.h>
#include <string.h>

int main ()
{
  char multiString[] ="First line of text.\nSecond line of text.";
  char *singleString = NULL; //Always initialize pointers!
  singleString = strchr(multiString, '\n'); //Look for newline-character
  if(singleString != NULL) singleString++; //Skip the newline-character
  if(strlen(singleString)) printf("Output: %s\n", singleString);
  return 0;
}

This example will produce:

 

Sorry for the late response. I was messing around with this code until i got it running the way i want it to be. Thank you for ur great help.