In my case, I needed to call a powershell script from a c or c++ code source, found few links which were pretty clumsy and not good with c++, I simply want a roadmap if its possible invoking a powershell script which lists directory contents from a code snippet written in c or c++
C++ code :
#include<iostream>
#include <io.h> // For access().
#include <sys/types.h> // For stat().
#include <sys/stat.h> // For stat().
#include <string>
using namespace std;
void main()
{
string strPath = "d:\\callPowerShell.ps1";
//access function:
//The function returns 0 if the file has the given mode.
//The function returns –1 if the named file does not exist or does not have the given mode
if(access(strPath.c_str(),0) == 0)
{
system("start powershell.exe Set-ExecutionPolicy RemoteSigned \n");
system("start powershell.exe d:\\callPowerShell.ps1");
system("cls");
}
else
{
system("cls");
cout << "File is not exist";
system("pause");
}
}
First error :
#include <io.h> // For access().
access is in this lib:
#include <cstdlib>
Next :
error: 'system' was not declared in this scope
#include <unistd.h>
And finally :
The caractere '\' is a special caractere for C/C++ then you have to add another '\' like :
system("start powershell.exe C:\\users\\sqtk-mal\\script1.ps1");
In C++
#include <cstdlib>
std::system("command");
In c
#include <stdlib.h>
system("command");
Related
I am trying to parse a json file within my program:
#include <jsoncpp/json/value.h>
#include <jsoncpp/json/json.h>
#include <unistd.h>
#include <stdio.h>
int main(){
std::string plan { get_current_dir_name() };
plan += "directory/file.json";
read_json(plan); // A function that reads a json file using jsoncpp
}
Output:
Error: Json File not found!
However when I manually write the entire path:
#include <jsoncpp/json/value.h>
#include <jsoncpp/json/json.h>
#include <unistd.h>
#include <stdio.h>
int main(){
std::string plan { entire_file_path };
read_json(plan); // A function that reads a json file using jsoncpp
}
Output:
File found and read!
I thought maybe there is a spelling mistake but when I use std::cout on both of the paths, there is not a single difference. I'm not sure what is causing this issue.
Using std::filesystem built-in to C++17:
namespace fs = std::filesystem;
fs::path path = fs::current_path() / "directory" / "file.json";
read_json(path.string());
#include <iostream>
#include <time.h>
#include <string.h>
#include <stdio.h>
int main()
{
string msg;
printf("Enter the message that you wish to display as scroller: ");
getline(cin,msg);
msg=msg+". ";
int x=0;
while(1)
{
Scroll(msg);
wait(100);
system("cls");
x++;
}
cin.get();
return 0;
}
I Have this C code and all strings in the file say 'identifier "string" is undefined'. I tried including <string> instead of <string.h> but it didn't work. Why is it not working?
Add
using namespace std;
After includes (but before main). Or, better, use notion of:
std::string // instead of string
Update: I missed the point of this being C-question. I will leave this answer, but for the sake of formality, use it if you came from Google and you are working with C++.
This is C++ code, not C.
The compiler is probably getting confused because it cannot parse it, so then it finds C-like code and all identifiers do not exist.
The includes should be:
#include <iostream>
#include <ctime>
#include <string>
#include <cstdio>
You are also missing a:
using namespace std;
Plus the definitions for Scroll and wait etc.
...Am trying to load/capture the output of system(char* command) function to a variable, a vector. can i have any possible way to push the output to my vector? I don*t want to write the output to file and read it again.
Sample code:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fstream>
#include <iostream>
#include <string>
#include <cstring>
#include <sstream>
#include <vector>
using namespace std;
int main()
{
vector <string> dir;
system("pwd");//here i used this to print the current directory, and i want to store this out put to my vector. something like...(below )
output=output of system("pwd");//this is not a real code,just to notice i want to put the out put to other var and push.
dir.push_back(output);
return 0;
}
Can i have any scenario to do this task, thanks.
I'd recommend doing it like this:
FILE *fp = popen("fortune","r");
char line[200];
while(!feof(fp)) {
fgets(line,200,fp);
// process here
}
pclose(fp);
If it's really performance critical it's probably better to
create a child process using fork() and pipes for stdin/stdout of that child
process to write or read from.
An example of this could be found here (http://www.microhowto.info/howto/capture_the_output_of_a_child_process_in_c.html#idp21888) if you're intested. But the popen method is probably the most simple and straightforward one in your case.
I'm writing a batch emulator as a personal project. I'm trying to implement the cd command using chdir() from unistd.h. However, using this causes a segfault.
main.cpp:
#include <cstdlib>
#include <iostream>
#include <string>
#include <vector>
#include <stdio.h>
//Custom headers
#include "splitting_algorithm.hpp"
#include "lowercase.hpp"
#include "chdir.hpp"
//Used to get and print the current working directory
#define GetCurrentDir getcwd
using namespace std;
int main(int argc, char* argv[])
{
string command;
//Begin REPL code
while (true)
{
//Prints current working directory
cout<<cCurrentPath<<": ";
std::getline(std::cin, command);
vector<string> tempCommand = strSplitter(command, " ");
string lowerCommand = makeLowercase(string(strSplitter(command, " ")[0]));
//Help text
if(tempCommand.size()==2 && string(tempCommand[1])=="/?")
{
cout<<helpText(lowerCommand);
}
//Exit command
else if(lowerCommand=="exit")
{
return 0;
}
else if(lowerCommand=="chdir")
{
cout<<string(tempCommand[1])<<endl;
chdir(tempCommand[1]);
}
else
cout<<"Can't recognize \'"<<string(tempCommand[0])<<"\' as an internal or external command, or batch script."<<endl;
}
return 0;
}
chdir.cpp:
#include <cstdlib>
#include <string>
#include <unistd.h>
void chdir(std::string path)
{
//Changes the current working directory to path
chdir(path);
}
Strangely enough, using cout to get the path for chdir works perfectly fine. How do I fix this?
You have recursive, unterminated behaviour in Your code. This overflows the stack.
Try to insert breakpoint in void chdir(std::string path) and see what happens.
You will see that the function chdir calls itself, and in turn calls itself again, and again and... well, segmentation fault.
Also, try to see what "call stack" is in the debugger, this issue is very visible there.
You should invoke the underlying chdir function using
::chdir(path.c_str());
or you will just call your own method again.
In unistd.h, chdir is defined as:
int chdir(const char *);
So you must call it with a const char* argument or the compiler will search for another function called "chdir" which take a std::string argument and use that instead.
Hey just found a library i want to use called coni.h to change text colour. But im getting an error in one of the functions: textcolour(RED); It says that it is undefined.
#include <iostream>
#include <string>
#include <conio.h>
#include "Storyline.h"
using namespace std;
int main()
{
Storyline story;
story.Story("Title.txt");
textcolor(MAGENTA+BLINK);
cout << "Hello";
getchar();
getchar();
}
I simply used system("color 0a"); from the "Windows.h". And i now have what i needed.