gnuplot.exe path not found for writing in c++

Question

I'm new to gnuplot and was trying to just make a plot of random numbers to visualize the distribution of the psuedo-random rand() function in c++. However, I came across a problem that appears common: the path was not found for gnuplot.exe.

Possible relevant information before I go on:

Running Windows 10 64-bit. Compiler: CLion. gnuplot.exe path: C:\Program Files (x86)\gnuplot\bin I have the latest version of gnuplot form sourceforge (as of 10/21/19: 5.2.7 I believe).

I have already checked these questions:

gnuplot-cpp cannot feed command to pipe

Gnuplot & C++: Can't find gnuplot neither in PATH nor in "

I've looked through many other questions but they weren't as relevant to the problem I have. I tried implementing the answers there and did not make any progress. I have the same gnuplot_i.hpp file and changed the problem line to:

#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__TOS_WIN__)
std::string Gnuplot::m_sGNUPlotFileName = "gnuplot.exe";
std::string Gnuplot::m_sGNUPlotPath = "C:/Program_Files(x86)/gnuplot/bin/";

I also have the correct PATH set for gnuplot as a environmental variable and can execute gnuplot from cmd.

The errors I've gotten were:

Cannot find gnuplot neither in PATH nor in "C:/Program_Files(x86)/gnuplot/bin"

and, when I removed the "_" from the path above and replaced it with a space:

'C:\Program' is not recognized as an internal or external command,
operable program or batch file.

This last one is the only one that appears now, even though I do not have the space anymore, as it's been mentioned that having spaces in the path is a known bug with gnuplot. I am aware that Program_Files(x86) is not a real path, I was just trying to get rid of the second error message.

My main.cpp, if it even matters:

#include <iostream>
#include "gnuplot_i.h"
#include <cstdlib>
#include <vector>

using namespace std;

int main(int argc, char* argv[]) {
    try {
        Gnuplot rand_plot("lines");
    }
    catch (GnuplotException ge) {
        cout << ge.what() << endl;
    }
    return 0;
}

Any help on solving these errors would be greatly appreciated.

Answer 1

Botje in the comments solved the issue. Changing lines 1714-1715 in gnuplot_i.h to std::string tmp = std::string("\"") + Gnuplot::m_sGNUPlotPath + "/" + Gnuplot::m_sGNUPlotFileName + std::string("\""); fixed the problem.