PDFLib学习

     由于开发的三维整形软件，需要提供整容的专业报告，所以要在虚拟整容之后提供一个PDF文档。在网上查询了许多，大家常用的就是PDFLib。如何使用Acrobat标准的简体中文字体呢？特转载收藏了一些PDF基本知识，希望以后软件开发能够用的上。

       PDF文件格式以其安全可靠，易于交换，及保真度高而成为电子文档的标准。PDFlib是一套在国际上非常流行的在服务器端批量生成PDF文档的功能强大的软件包。国外许多政府，税务，银行，水电，邮电部门用其在线生成PDF格式的单据及报表。

        对于国内用户来说，如何使用PDFlib输出简体中文会是我们最关心的问题。在这里我将于大家一起分享自己的一些心得体会，不对之处请指正，若我所说于PDFlib手册有冲突，请以手册为准。我的邮箱是 :[email protected] 。

       对于没有接触过PDFlib的朋友，如果你们感兴趣，可以从这个链接http://www.pdflib.com/products/pdflib/download/index.html 下载PDFlib软件包。(也可以到VC知识库工具与资源栏目下载) 在没有license的情况下，你仍可使用其所有功能，只是生成的PDF文档带有PDFlib的水印。

       PDFlib提供C,C++, Java, Perl, PHP, Python, Tcl 及RealBasic的语言接口。以下所有的例子将采用C。

如何使用Acrobat 标准的简体中文字体

       PDFlib自带STSong-Light，AdobeSongStd-Light-Acro，及STSongStd-Light-Acro三种简体中文字体。这三种字体同时也是Acrobat的简体中文标准字体。
以上三种字体均支持以下几种编码（Encoding）：UniGB-UCS2-H，UniGB-UCS2-V，UniGB-UTF16-H，UniGB-UTF16-V，GB-EUC-H，GB-EUC-V，GBpc-EUC-H，GBpc-EUC-V，GBK-EUC-H，GBK-EUC-V，GBKp-EUC-H，GBKp-EUC-V，GBK2K-H，及GBK2K-V。各编码的定义请见下表1.1:

表1.1

Encoding	Character set and text format
UniGB-UCS2-H UniGB-UCS2-V	Unicode (UCS-2) encoding for the Adobe-GB1 character collection
UniGB-UTF16-H UniGB-UTF16-V	Unicode (UTF-16BE) encoding for the Adobe-GB1 character collection.Contains mappings for all characters in the GB18030-2000 character set.
GB-EUC-H GB-EUC-V	Microsoft Code Page 936 (charset 134), GB 2312-80 character set, EUC-CN encoding
GBpc-EUC-H GBpc-EUC-V	Macintosh, GB 2312-80 character set, EUC-CN encoding, Script Managercode 2
GBK-EUC-H GBK-EUC-V	Microsoft Code Page 936 (charset 134), GBK character set, GBK encoding
GBKp-EUC-H GBKp-EUC-V	Same as GBK-EUC-H, but replaces half-width Latin characters withproportional forms and maps code 0x24 to dollar ($) instead of yuan (￥).
GBK2K-H GBK2K-V	GB 18030-2000 character set, mixed 1-, 2-, and 4-byte encoding

编码以-H结尾的，表示字体将会横向输出；以 –V结尾的，表示字体将会纵向输出。以Uni开头的是Unicode类编码，如果你的输入字符串是Unicode，则应选择此类编码。以GB开头的是CP936类编码，如果你的输入字符串是Code Page 936，则应选择此类编码。
在PDFlib中若想调用以上其中一种字体，可直接用字体名和相应的编码：

int  	 Font_CS;
Font_CS = PDF_load_font(p, " STSong-Light ", 0, " ", " UniGB-UTF16-H");

不久，你们将会发现，字体与编码间可有非常多的组合，而PDFlib的字体功能（function）并不支持所有的组合。最为保险的组合是PDFlib自带三种字体与Unicode类编码的组合。

下面是一个使用PDFlib自带字体及编码的C 源程序

#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
#include "pdflib.h"  
  
int main(void)  
{  
    PDF             *p = NULL;  
    int         i = 0, j = 0, Left = 50, Top = 800;  
    int         Font_E = 0, Font_CS = 0;  
    char        TextUnicode[] = "\x80\x7B\x53\x4F\x2D\x4E\x87\x65";  
    char            TextCp936[] = "\xBC\xF2\xCC\xE5\xD6\xD0\xCE\xC4";  
    char            EncodingName[100];  
  
static const char *ChineseFont[] =   
{"STSong-Light",  "AdobeSongStd-Light-Acro",   "STSongStd-Light-Acro", };  
  
    static const char *Encoding[] =  
    {  
        "UniGB-UCS2-H",  
        "UniGB-UCS2-V",  
        "UniGB-UTF16-H",  
        "UniGB-UTF16-V",  
        "GB-EUC-H",  
        "GB-EUC-V",  
        "GBpc-EUC-H",  
        "GBpc-EUC-V",  
        "GBK-EUC-H",  
        "GBK-EUC-V",  
        "GBKp-EUC-H",  
        "GBKp-EUC-V",  
        "GBK2K-H",  
        "GBK2K-V",  
    };  
  
    const int   fsize = sizeof ChineseFont / sizeof (char *);  
    const int   esize = sizeof Encoding / sizeof (char *);          
  
    /* 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) {  
    if (PDF_begin_document(p, "pdflib_cs1.pdf", 0, "") == -1)   
             {  
        printf("Error: %s\n", PDF_get_errmsg(p));  
        return(2);  
    }  
  
        PDF_set_info(p, "Creator", "pdflib_cs1.c");  
        PDF_set_info(p, "Author", "[email protected]");  
        PDF_set_info(p, "Title", "Output Chinese Simplify with PDFlib builtin font");  
        Font_E = PDF_load_font(p, "Helvetica-Bold", 0, "winansi", "");  
  
        for (i = 0; i < fsize; i++)  
        {  
            /*Start a new page. */  
            Top = 800;  
            PDF_begin_page_ext(p, a4_width, a4_height, "");   
            PDF_setfont(p, Font_E, 24);  
            PDF_show_xy(p, ChineseFont[i] , Left + 50,  Top);  
            Top -= 30;  
  
            for (j = 0; j < esize; j++)  
            {  
                Font_CS = PDF_load_font(p, ChineseFont[i], 0, Encoding[j], "");  
       PDF_setfont(p, Font_E, 12);  
                strcpy(EncodingName, "");  
                strcat(EncodingName,  Encoding[j]);  
                strcat(EncodingName,  ":");  
                PDF_show_xy(p, EncodingName , Left,  Top);  
                PDF_setfont(p, Font_CS, 12);  
  
                if (strstr(Encoding[j], "-H") != NULL)  
                {  
                    /* It''s horizontal encoding. */  
                    Top -= 15;  
                }  
  
                if (strstr(Encoding[j], "UniGB") != NULL)  
                {  
                    /* It''s unicode encoding. */  
                    PDF_show_xy2(p, TextUnicode, 8, Left,  Top);  
                }  
                else  
                {  
                    /* It''s code page 936 encoding. */  
                    PDF_show_xy2(p, TextCp936, 8, Left,  Top);  
                }  
  
                if (strstr(Encoding[j], "-H") != NULL)  
                {  
                    /* It''s horizontal encoding. */  
                    Top -= 25;  
                }  
                else  
                {  
                    /* It''s vertical encoding. */  
                    Top -= 65;  
                }  
  
            } /* for */  
  
            /* End of page. */  
        PDF_end_page_ext(p, "");  
        } /* for */  
  
        PDF_end_document(p, "");  
    }  
  
    PDF_CATCH(p) {  
        printf("PDFlib exception occurred in pdflib_cs1 sample:\n");  
        printf("[%d] %s: %s\n",  
        PDF_get_errnum(p), PDF_get_apiname(p), PDF_get_errmsg(p));  
        PDF_delete(p);  
        return(2);  
    }  
  
    PDF_delete(p);  
    return 0;  
}  

下面是一个相关的例子--C 源程序

/*******************************************************************/  
/* This example demostrates the usage of host font and other fonts 
/* based on Chinese Simplifed Windows. 
/*******************************************************************/  
  
#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
  
#include "pdflib.h"  
  
int main(void)  
{  
    PDF         *p = NULL;  
    int             i = 0, j = 0, Left = 50, Top = 800;  
    int             Font_E = 0, Font_CS = 0;  
    char          fontfile[1024];  
    char          buf[1024];  
    char          TextUnicode[] = "\x80\x7B\x53\x4F\x2D\x4E\x87\x65";  
  
    /* 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) {  
    if (PDF_begin_document(p, "pdflib_cs2.pdf", 0, "") == -1)   
             {  
        printf("Error: %s\n", PDF_get_errmsg(p));  
        return(2);  
    }  
  
    PDF_set_info(p, "Creator", "pdflib_cs2.c");  
    PDF_set_info(p, "Author", "[email protected]");  
    PDF_set_info(p, "Title", "Output Chinese Simplify with host font and others");  
  
        /* Start a new page. */  
        PDF_begin_page_ext(p, a4_width, a4_height, "");  
        Font_E = PDF_load_font(p, "Helvetica-Bold", 0, "winansi", "");  
  
        /* Using host font -- C:\WINDOWS\Fonts\SimHei.ttf.  
           PDFlib is using BOM UTF8 string to calling multi-byte character string 
           SimHei.ttf font name is "黑体", its corresponding BOM UTF8 string is  
           "\xEF\xBB\xBF\xE9\xBB\x91\xE4\xBD\x93" */  
  
        Font_CS= PDF_load_font(p, "\xEF\xBB\xBF\xE9\xBB\x91\xE4\xBD\x93", 0, "unicode", "");  
        /* Font_CS= PDF_load_font(p, "SimHei", 0, "unicode", ""); */  
          
        PDF_setfont(p, Font_E, 20);  
        PDF_show_xy(p, "SimHei font:" , Left,  Top);  
        PDF_setfont(p, Font_CS, 24);  
        Top-=30;  
        PDF_show_xy(p, TextUnicode , Left,  Top);  
  
        /* Using other disk-based font file that is not installed in system directory --  
            C:\PSFONTS\CS\gkai00mp.ttf*/  
        Top-=50;  
        strcpy(fontfile, "C:\\PSFONTS\\CS\\gkai00mp.ttf");  
        sprintf(buf, "kai=%s", fontfile);  
        /* Defines kai as alias for ..\gkai00mp.ttf */  
        PDF_set_parameter(p, "FontOutline", buf);   
        Font_CS= PDF_load_font(p, "kai", 0, "unicode", "");  
        PDF_setfont(p, Font_E, 20);  
        PDF_show_xy(p, "AR PL KaitiM GB  font:" , Left,  Top);  
        PDF_setfont(p, Font_CS, 24);  
        Top-=30;  
        PDF_show_xy(p, TextUnicode , Left,  Top);  
  
        /* Using TrueType collection font with index -- C:\WINDOWS\Fonts\simsun.ttc*/  
        Top-=50;  
        strcpy(fontfile, "C:\\WINDOWS\\Fonts\\simsun.ttc");  
        sprintf(buf, "simsun=%s", fontfile);  
        /* Defines AdobeSongStd as alias for ..\AdobeSongStd-Light.otf  
        This only need to claim once will be sufficient to  
        configure all fonts in simsun.ttc*/  
        PDF_set_parameter(p, "FontOutline", buf);   
        /* TTC files contain multiple separate fonts. 
        Address 1st font by appending a colon character and 0 after alias simsun */  
        Font_CS= PDF_load_font(p, "simsun:0", 0, "unicode", "");  
        PDF_setfont(p, Font_E, 20);  
        PDF_show_xy(p, "simsun:0 font:", Left, Top);  
        PDF_setfont(p, Font_CS, 24);  
        Top-=30;  
        PDF_show_xy2(p, TextUnicode, 8, Left,  Top);  
  
        /*Address 2nd font by appending a colon character and 1 after alias simsun */  
        Top-=50;  
        Font_CS= PDF_load_font(p, "simsun:1", 0, "unicode", "");  
        PDF_setfont(p, Font_E, 20);  
        PDF_show_xy(p, "simsun:1 font:", Left, Top);  
        PDF_setfont(p, Font_CS, 24);  
        Top-=30;  
        PDF_show_xy2(p, TextUnicode, 8, Left,  Top);  
  
        /* End of page. */  
        PDF_end_page_ext(p, "");  
        PDF_end_document(p, "");  
    }  
  
    PDF_CATCH(p) {  
        printf("PDFlib exception occurred in pdflib_cs2 sample:\n");  
        printf("[%d] %s: %s\n",  
        PDF_get_errnum(p), PDF_get_apiname(p), PDF_get_errmsg(p));  
        PDF_delete(p);  
        return(2);  
    }  
  
    PDF_delete(p);  
    return 0;  
}  

/*******************************************************************/  
/* This example demostrates different ways to output Chinese Simplified text 
/* under Chinese Simplifed Windows. 
/*******************************************************************/  
  
#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
#include "pdflib.h"  
  
int main(void)  
{  
    PDF         *p = NULL;  
    int         i = 0, j = 0, Left = 50, Top = 800, Right = 545;  
    int         Font_E = 0, Font_CS = 0, Font_CS2 = 0, TextFlow = 0;  
    char        TextUnicode[] = "\x80\x7B\x53\x4F\x2D\x4E\x87\x65";  
    char        TextCp936[] = "\xBC\xF2\xCC\xE5\xD6\xD0\xCE\xC4";  
  
    /* 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) {  
    if (PDF_begin_document(p, "pdflib_cs3.pdf", 0, "") == -1)   
            {  
        printf("Error: %s\n", PDF_get_errmsg(p));  
        return(2);  
    }  
  
       PDF_set_info(p, "Creator", "pdflib_cs3.c");  
       PDF_set_info(p, "Author", "[email protected]");  
       PDF_set_info(p, "Title", "Different Ways To Output Chinese Simplify");  
  
        /* Start a new page. */  
        PDF_begin_page_ext(p, a4_width, a4_height, "");  
        Font_E = PDF_load_font(p, "Helvetica-Bold", 0, "winansi", "");  
        Font_CS = PDF_load_font(p, "STSong-Light", 0, "UniGB-UCS2-H", "");  
        Font_CS2 = PDF_load_font(p, "STSong-Light", 0, "GB-EUC-H", "");  
  
        /* Using PDF_set_text_pos and PDF_show functions. */  
        PDF_setfont(p, Font_E, 20);  
        PDF_set_text_pos(p, Left, Top);  
        PDF_show(p, "Using PDF_set_text_pos and PDF_show to output text:");  
        Top-=30;  
        PDF_set_text_pos(p, Left+20, Top);  
        PDF_show(p, "UniGB-UCS2-H encoding:");  
        PDF_setfont(p, Font_CS, 24);  
        Top-=30;  
        PDF_set_text_pos(p, Left+20, Top);  
        PDF_show2(p, TextUnicode, 8);  
        Top-=30;  
        PDF_setfont(p, Font_E, 20);  
        PDF_set_text_pos(p, Left+20, Top);  
        PDF_show(p, "GB-EUC-H encoding:");  
        PDF_setfont(p, Font_CS2, 24);  
        Top-=30;  
        PDF_set_text_pos(p, Left+20, Top);  
        PDF_show2(p, TextCp936, 8);  
  
        /* Using PDF_show_xy function. */  
        Top-=50;  
        PDF_setfont(p, Font_E, 20);  
        PDF_show_xy(p, "Using PDF_show_xy to output text:" , Left,  Top);  
        Top-=30;  
        PDF_show_xy(p, "UniGB-UCS2-H encoding:" , Left+20,  Top);  
        PDF_setfont(p, Font_CS, 24);  
        Top-=30;  
        PDF_show_xy2(p, TextUnicode, 8, Left+20,  Top);  
        Top-=30;  
        PDF_setfont(p, Font_E, 20);  
        PDF_show_xy(p, "GB-EUC-H encoding:", Left+20,  Top);  
        Top-=30;  
        PDF_setfont(p, Font_CS2, 24);  
        PDF_show_xy2(p, TextCp936, 8, Left+20,  Top);  
  
        /* Using PDF_continue_text function. */  
        Top-=30;  
        PDF_setfont(p, Font_E, 20);  
        PDF_set_text_pos(p, Left, Top);  
        PDF_continue_text(p, "Using PDF_continue_text to output text:");  
        Top-=30;  
        PDF_set_text_pos(p, Left+20, Top);  
        PDF_continue_text(p, "UniGB-UCS2-H encoding:");  
        PDF_setfont(p, Font_CS, 24);  
        PDF_continue_text2(p, TextUnicode, 8);  
        PDF_setfont(p, Font_E, 20);  
        PDF_continue_text(p, "GB-EUC-H encoding:");  
        PDF_setfont(p, Font_CS2, 24);  
        PDF_continue_text2(p, TextCp936, 8);  
  
        /* Using PDF_fit_textline function. */  
        Top-=140;  
        PDF_setfont(p, Font_E, 20);  
        PDF_fit_textline(p, "Using PDF_fit_textline to output text:", 0, Left, Top, "");  
        Top-=30;  
        PDF_fit_textline(p, "UniGB-UCS2-H encoding:", 0, Left+20, Top, "");  
        PDF_setfont(p, Font_CS, 24);  
        Top-=30;  
        PDF_fit_textline(p, TextUnicode, 8, Left+20, Top, "");  
  
        /* Using PDF_create_textflow, PDF_fit_textflow and PDF_delete_textflow function. */  
        Top-=30;  
        PDF_setfont(p, Font_E, 20);  
        TextFlow = PDF_create_textflow(p,   
            "Using PDF_create_textflow, PDF_fit_textflow and PDF_delete_textflow to output text:",   
            0, "fontname=Helvetica-Bold fontsize=20 encoding=winansi");  
        PDF_fit_textflow(p, TextFlow, Left, Top, Right, Top-60, "");  
        Top-=60;  
        TextFlow = PDF_create_textflow(p, "UniGB-UCS2-H encoding:", 0,    
            "fontname=Helvetica-Bold fontsize=20 encoding=winansi");  
        PDF_fit_textflow(p, TextFlow, Left+20, Top, Right, Top-30, "");  
        Top-=30;  
        TextFlow = PDF_create_textflow(p, TextUnicode, 8, "fontname=STSong-Light   
            fontsize=24 encoding=UniGB-UCS2-H textlen=8");  
        PDF_fit_textflow(p, TextFlow, Left+20, Top, Right, Top-30, "");  
        PDF_delete_textflow(p, TextFlow);  
  
        /* End of page. */  
    PDF_end_page_ext(p, "");  
        PDF_end_document(p, "");  
    }  
  
    PDF_CATCH(p) {  
        printf("PDFlib exception occurred in pdflib_cs3 sample:\n");  
        printf("[%d] %s: %s\n",  
        PDF_get_errnum(p), PDF_get_apiname(p), PDF_get_errmsg(p));  
        PDF_delete(p);  
        return(2);  
    }  
  
    PDF_delete(p);  
    return 0;  
}