gmt-makemap/test/gmttest.cpp

#include <gmt.h>
#include <iostream>
#include <string>
#include <unistd.h>
#include <sys/wait.h>

int print_func(FILE* fd, const char* str)
{
 std::cout<<"PRINT: "<<str<<std::endl;
 return 0;
}
/*
int callgmtmodule(void *API, const char *module, int mode, void *args, std::string& res)
{
 int pipefd[2];
 int savefd;


}
*/

int main()
{
 char* text="GMT";
 //void* out;
 void* gmtapi;
 std::string args="-R130/160/40/60 -JM12c -Xa2c -Ya2c -B5/5/swNE --GMT_HISTORY=f --FONT_ANNOT_PRIMARY=14p,Times-Bold,red";
 struct GMT_OPTION* opts;
 int io,ret;
 char fname[16];
 int pipefd[2];
 std::string out;
 char buffer[4096];
 pid_t pid;

 gmtapi=GMT_Create_Session(text,2,0,print_func);
 //io=GMT_Register_IO(gmtapi,GMT_IS_TEXTSET,GMT_IS_DUPLICATE,GMT_IS_NONE,GMT_OUT,0,0);
 //GMT_Encode_ID(gmtapi,fname,io);
 pipe(pipefd);
 args+=" ->/dev/fd/"+std::to_string(pipefd[1]);
 opts=GMT_Create_Options(gmtapi,0,(void*)args.c_str());
 //ret=GMT_Init_IO(gmtapi,GMT_IS_TEXTSET,GMT_IS_NONE,GMT_OUT,5,0,opts);
 std::cout<<io<<" "<<GMT_NOTSET<<" "<<fname<<" "<<ret<<std::endl;


 pid=fork();
 if(0==pid)
 {
  //dup2(pipefd[1],1);
  GMT_Call_Module(gmtapi,"psbasemap",GMT_MODULE_OPT,opts);
  close(pipefd[1]);
  exit(0);
 }
 else
 {
  ssize_t br;
//  std::string s="CALL\n";
//  write(1,s.c_str(),s.length());
//  close(pipefd[1]);

  do
  {
   br=read(pipefd[0],buffer,4096);
   std::cout<<out.max_size()<<" "<<out.capacity()<<" "<<out.size()<<std::endl;
   out.append(buffer,br);
  } while(0!=br);
  wait(0);
//  close(pipefd[0]);

 }

 out.shrink_to_fit();
 std::cout<<out.max_size()<<" "<<out.capacity()<<" "<<out.size()<<std::endl;

 GMT_Destroy_Options(gmtapi,&opts);
 GMT_Destroy_Session(gmtapi);

 return 0;
}