Gnuplot,来自windows.命令窗口打开和关闭

#ifdef WIN32
  gp = _popen("C:\Program Files (x86)\gnuplot\bin\pgnuplot.exe","w");
#else
  gp = popen("gnuplot -persist","w");
#endif


 if (gp == NULL)
       return -1;

  /* fprintf(gp,"unset border\n");
  fprintf(gp,"set clip\n");
  fprintf(gp,"set polar\n");
  fprintf(gp,"set xtics axis nomirror\n");
  fprintf(gp,"set ytics axis nomirror\n");
  fprintf(gp,"unset rtics\n");
  fprintf(gp,"set samples 160\n");
  fprintf(gp,"set zeroaxis");
    fprintf(gp,"  set trange [0:2*pi]");*/


  fprintf(gp,"set term png\n");
  fprintf(gp,"set output \"c:\\printme.png\"");
  fprintf(gp,"plot .5,1,1.5\n");
   fprintf(gp,"pause -1\n");

     fflush(gp);

以下程序已在Windows上使用Visual Studio和MinGW编译器以及使用gcc的GNU / Linux进行了测试. gnuplot二进制文件必须位于路径上,而在Windows上,必须使用二进制文件的管道pgnuplot版本.

我发现Windows管道比GNU / Linux上的相应管道慢得多.对于大型数据集,在Windows上通过管道将数据传输到gnuplot很慢并且通常不可靠.此外,按键等待代码在GNU / Linux上更有用,其中一旦调用pclose(),绘图窗口将关闭.

#include <iostream>
#include <stdio.h>
#include <stdlib.h>

// Tested on:
// 1. Visual Studio 2012 on Windows
// 2. Mingw gcc 4.7.1 on Windows
// 3. gcc 4.6.3 on GNU/Linux

// Note that gnuplot binary must be on the path
// and on Windows we need to use the piped version of gnuplot
#ifdef WIN32
    #define GNUPLOT_NAME "pgnuplot -persist"
#else 
    #define GNUPLOT_NAME "gnuplot"
#endif

int main() 
{
    #ifdef WIN32
        FILE *pipe = _popen(GNUPLOT_NAME,"w");
    #else
        FILE *pipe = popen(GNUPLOT_NAME,"w");
    #endif

    if (pipe != NULL)
    {
        fprintf(pipe,"set term wx\n");         // set the terminal
        fprintf(pipe,"plot '-' with lines\n"); // plot type
        for(int i = 0; i < 10; i++)             // loop over the data [0,...,9]
            fprintf(pipe,"%d\n",i);           // data terminated with \n
        fprintf(pipe,"%s\n","e");             // termination character
        fflush(pipe);                           // flush the pipe

        // wait for key press
        std::cin.clear();
        std::cin.ignore(std::cin.rdbuf()->in_avail());
        std::cin.get();

        #ifdef WIN32
                _pclose(pipe);
        #else
                pclose(pipe);
        #endif
    }
    else
        std::cout << "Could not open pipe" << std::endl; 
return 0;
}