使用PDFLib生成PDF文档,C代码实例--使用特色

本文通过一个C语言示例程序演示了如何使用PDFlib库创建包含特性颜色及叠印效果的PDF文档。该程序定义了不同的颜色模式,并通过控制叠印模式实现了多种颜色混合效果。

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注意:

览生成的PDF文件时,要看到特色的效果,需要设置 Acrobat或AcroReader的OverPrint 属性,大概位置在 编辑->高级 中,版本不同具体位置也不同。

#include <stdio.h>
int SpotColor()
{
     PDF *p;
     int i, font;
     int handle;
     int x, y;

     /* create a new PDFlib object */
     if ((p = PDF_new()) == (PDF *) 0)
     {
         printf("Couldn't create PDFlib object (out of memory)!/n");
         return(2);
     }

     PDF_TRY(p) {
         /* This means we must check return values of load_font() etc. */
         PDF_set_parameter(p, "errorpolicy", "return");

         if (PDF_begin_document(p, "d://hello.pdf", 0, "") == -1) {
              printf("Error: %s/n", PDF_get_errmsg(p));
              return(2);
         }

         /* This line is required to avoid problems on Japanese systems */
         PDF_set_parameter(p, "hypertextencoding", "host");
         PDF_set_parameter(p, "fakebold", "true");

         PDF_set_info(p, "Creator", "SpotColor.c");
         PDF_set_info(p, "Author", "");
         PDF_set_info(p, "Title", "");
         PDF_begin_page_ext(p, a4_width, a4_height, "");
       {
              PDF_setcolor(p, "stroke", "cmyk", 0, 0, 1, 0);
              PDF_moveto(p, 50, 620);
              PDF_lineto(p, 200, 620);
              PDF_stroke(p);

              handle = PDF_makespotcolor(p, "PANTONE 871 C", 0);
              PDF_setcolor(p, "stroke", "spot", handle, 0.5, 0, 0);
              PDF_setcolor(p, "stroke", "cmyk", 0, 1, 0, 0);
              PDF_moveto(p, 100, 620);
              PDF_lineto(p, 250, 620);

              PDF_stroke(p);

              PDF_setcolor(p, "stroke", "cmyk", 1, 0, 0, 0);
              PDF_moveto(p, 150, 620);
              PDF_lineto(p, 300, 620);

              PDF_stroke(p);


              PDF_setcolor(p, "fill", "cmyk", 0, 0, 1, 0);
              handle = PDF_makespotcolor(p, "PANTONE 871 C", 0);
              PDF_setcolor(p, "fill", "spot", handle, 0.4, 0, 0);

              PDF_moveto(p, 50, 600);
              PDF_lineto(p, 200, 600);
              PDF_lineto(p, 200, 550);
              PDF_lineto(p, 50, 550);

              PDF_fill(p);
              handle = PDF_makespotcolor(p, "PANTONE 871 C", 0);
              PDF_setcolor(p, "fill", "spot", handle, 0.5, 0, 0);
              PDF_setcolor(p, "fill", "cmyk", 0, 1, 0, 0);
              PDF_moveto(p, 100, 600);
              PDF_lineto(p, 250, 600);
              PDF_lineto(p, 250, 550);
              PDF_lineto(p, 100, 550);

              PDF_fill(p);


              PDF_setcolor(p, "fill", "cmyk", 1, 0, 0, 0);
              PDF_moveto(p, 150, 600);
              PDF_lineto(p, 300, 600);
              PDF_lineto(p, 300, 550);
              PDF_lineto(p, 150, 550);

              PDF_fill(p);

         }
        
         {
              handle = PDF_create_gstate(p, "overprintmode=1");
              PDF_set_gstate(p, handle);


              PDF_setcolor(p, "stroke", "cmyk", 0, 0, 1, 0);

              handle = PDF_makespotcolor(p, "PANTONE 871 C", 0);
              PDF_setcolor(p, "stroke", "spot", handle, 0.5, 0, 0);

              PDF_moveto(p, 50, 520);
              PDF_lineto(p, 200, 520);

              PDF_stroke(p);

              handle = PDF_makespotcolor(p, "PANTONE 871 C", 0);
              PDF_setcolor(p, "stroke", "spot", handle, 0.5, 0, 0);
              PDF_setcolor(p, "stroke", "cmyk", 0, 1, 0, 0);
              PDF_moveto(p, 100, 520);
              PDF_lineto(p, 250, 520);

              PDF_stroke(p);


              PDF_setcolor(p, "stroke", "cmyk", 1, 0, 0, 0);
              PDF_moveto(p, 150, 520);
              PDF_lineto(p, 300, 520);

              PDF_stroke(p);


              handle = PDF_create_gstate(p, "overprintfill=true");
              PDF_set_gstate(p, handle);

              PDF_setcolor(p, "fill", "cmyk", 0, 0, 1, 0);
              handle = PDF_makespotcolor(p, "PANTONE 871 C", 0);
              PDF_setcolor(p, "fill", "spot", handle, 0.4, 0, 0);

              PDF_moveto(p, 50, 500);
              PDF_lineto(p, 200, 500);
              PDF_lineto(p, 200, 450);
              PDF_lineto(p, 50, 450);

              PDF_fill(p);


              handle = PDF_makespotcolor(p, "PANTONE 871 C", 0);
              PDF_setcolor(p, "fill", "spot", handle, 0.5, 0, 0);
              PDF_setcolor(p, "fill", "cmyk", 0, 1, 0, 0);
              PDF_moveto(p, 100, 500);
              PDF_lineto(p, 250, 500);
              PDF_lineto(p, 250, 450);
              PDF_lineto(p, 100, 450);

              PDF_fill(p);


              PDF_setcolor(p, "fill", "cmyk", 1, 0, 0, 0);
              PDF_moveto(p, 150, 500);
              PDF_lineto(p, 300, 500);
              PDF_lineto(p, 300, 450);
              PDF_lineto(p, 150, 450);

              PDF_fill(p);
         }
        

         {
              handle = PDF_create_gstate(p, "overprintstroke=true");
              PDF_set_gstate(p, handle);


              PDF_setcolor(p, "stroke", "cmyk", 0, 0, 1, 0);

              handle = PDF_makespotcolor(p, "PANTONE 871 C", 0);
              PDF_setcolor(p, "stroke", "spot", handle, 0.5, 0, 0);

              PDF_moveto(p, 50, 420);
              PDF_lineto(p, 200, 420);
              PDF_stroke(p);

              handle = PDF_makespotcolor(p, "PANTONE 871 C", 0);
              PDF_setcolor(p, "stroke", "spot", handle, 0.5, 0, 0);
              PDF_setcolor(p, "stroke", "cmyk", 0, 1, 0, 0);
              PDF_moveto(p, 100, 420);
              PDF_lineto(p, 250, 420);

              PDF_stroke(p);


              PDF_setcolor(p, "stroke", "cmyk", 1, 0, 0, 0);
              PDF_moveto(p, 150, 420);
              PDF_lineto(p, 300, 420);

              PDF_stroke(p);


              handle = PDF_create_gstate(p, "overprintfill=false");
              PDF_set_gstate(p, handle);

              PDF_setcolor(p, "fill", "cmyk", 0, 0, 1, 0);
              handle = PDF_makespotcolor(p, "PANTONE 871 C", 0);
              PDF_setcolor(p, "fill", "spot", handle, 0.4, 0, 0);

              PDF_moveto(p, 50, 400);
              PDF_lineto(p, 200, 400);
              PDF_lineto(p, 200, 350);
              PDF_lineto(p, 50, 350);

              PDF_fill(p);


              handle = PDF_makespotcolor(p, "PANTONE 871 C", 0);
              PDF_setcolor(p, "fill", "spot", handle, 0.5, 0, 0);
              PDF_setcolor(p, "fill", "cmyk", 0, 1, 0, 0);
              PDF_moveto(p, 100, 400);
              PDF_lineto(p, 250, 400);
              PDF_lineto(p, 250, 350);
              PDF_lineto(p, 100, 350);

              PDF_fill(p);


              PDF_setcolor(p, "fill", "cmyk", 1, 0, 0, 0);
              PDF_moveto(p, 150, 400);
              PDF_lineto(p, 300, 400);
              PDF_lineto(p, 300, 350);
              PDF_lineto(p, 150, 350);

              PDF_fill(p);
         }

         PDF_end_page_ext(p, "");
         PDF_end_document(p, "");
     }

     PDF_CATCH(p) {
         printf("PDFlib exception occurred in hello sample:/n");
         printf("[%d] %s: %s/n",
              PDF_get_errnum(p), PDF_get_apiname(p), PDF_get_errmsg(p));
         PDF_delete(p);
         getchar();
         return(2);
     }

     PDF_delete(p);

     execl("C://Program Files//Adobe//Acrobat 7.0//Acrobat//Acrobat.exe",
         "_execl",
         "d://hello.pdf", NULL, NULL);

     return 0;
}

#include <stdlib.h>
#include "pdflib.h"
#include <math.h>
#include <windows.h>
#include <WinBase.h>

Int main(void)
{
    SpotColor();
    return 0;
}
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