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浅谈PDFlib中文输出（一）

敬业的IT人 互联网 佚名 2008-1-4 18:37:45
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 :bowriver2001@yahoo.ca 。

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
/*******************************************************************//* This example demostrates the usage of PDFlib builtin 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       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", "bowriver2001@yahoo.ca");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;}
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