如何使用Ghostscript将PostScript文件转换为PDF文件格式: 

/* Example of using GS DLL as a ps2pdf converter. */

#if defined(_WIN32) && !defined(_Windows)
# define _Windows
#endif
#ifdef _Windows
/* add this source to a project with gsdll32.dll, or compile it directly with:
 *   cl -D_Windows -Isrc -Febin\ps2pdf.exe ps2pdf.c bin\gsdll32.lib
 */
# include <windows.h>
# define GSDLLEXPORT __declspec(dllimport)
#endif

#include "ierrors.h"
#include "iapi.h"

void *minst = NULL;

int main(int argc, char *argv[])
{
    int code, code1;
    const char * gsargv[7];
    int gsargc;
    gsargv[0] = "";
    gsargv[1] = "-dNOPAUSE";
    gsargv[2] = "-dBATCH";
    gsargv[3] = "-dSAFER";
    gsargv[4] = "-sDEVICE=pdfwrite";
    gsargv[5] = "-sOutputFile=out.pdf";
    gsargv[6] = "input.ps";
    gsargc=7;

    code = gsapi_new_instance(&minst, NULL);
    if (code < 0)
        return 1;
    code = gsapi_set_arg_encoding(minst, GS_ARG_ENCODING_UTF8);
    if (code == 0)
        code = gsapi_init_with_args(minst, gsargc, gsargv);
    code1 = gsapi_exit(minst);
    if ((code == 0) || (code == gs_error_Quit))
        code = code1;

    gsapi_delete_instance(minst);

    if ((code == 0) || (code == gs_error_Quit))
        return 0;
    return 1;
}

参考:

API — Ghostscript 10.03.0 documentation