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谈谈PDFlib 的几种文本输出函数

转帖|其它|编辑:郝浩|2011-01-28 11:39:24.000|阅读 1179 次

概述:本文主要介绍PDFlib 的几种文本输出函数,希望对大家有帮助。

# 界面/图表报表/文档/IDE等千款热门软控件火热销售中 >>

1.PDF_show

  void PDF_show(PDF *p, const char *text)

  void PDF_show2(PDF *p, const char *text, int len)

  在当前坐标用当前字体及字体大小输出文本。

  PDF_show将认为字符串是以空字符结尾(NULL);若字符串有可能含有空字符(如多字节字符串),用PDF_show2。

2.PDF_show_xy

  void PDF_show_xy(PDF *p, const char *text, double x, double y)

  void PDF_show_xy2(PDF *p, const char *text, int len, double x, double y)

  在给出的坐标用当前字体及字体大小输出文本。

  PDF_show_xy将认为字符串是以空字符结尾(NULL);若字符串有可能含有空字符(如多字节字符串),用PDF_show_xy2。

3.PDF_continue_text

  void PDF_continue_text(PDF *p, const char *text)

  void PDF_continue_text2(PDF *p, const char *text, int len)

  在下一行用当前字体及字体大小输出文本。

  PDF_continue_xy将认为字符串是以空字符结尾(NULL);若字符串有可能含有空字符(如多字节字符串),用PDF_continue_xy2。

4.PDF_fit_textline

  void PDF_fit_textline(PDF*p, const char *text, int len, double x, double y, const char *optlist)

  在给出的坐标根据选择项输出一行文本。

  若字符串是以空字符结尾(NULL),len为0;否则,给出具体字节数。

5.PDF_fit_textflow

  int PDF_create_textflow(PDF *p, const char *text, int len, const char *optlist)

  建立文本流对象,并预处理文本为下面的文本格式化做准备。

  若字符串是以空字符结尾(NULL),len为0;否则,给出具体字节数。

  const char *PDF_fit_textflow(PDF *p, int textflow, double llx, double lly, double urx, double ury, const char *optlist)

  将文本输出到相应的矩形块中。

  lly, llx, ury, urx, 分别是矩形块左下角及右上角的纵横坐标。

  void PDF_delete_textflow(PDF *p, int textflow)

  删除文本流对象及相关数据结构。

小结

  1,2, 3 组函数简洁,直观,易用。4,5组函数可通过对选择项的控制而输出更灵活的文本格式。尤其是第5组函数,是专门为多行文本设计的,可通过选项控制对齐,字间距,边框显示,旋转等。但4,5组函数有个局限,在字符串是多字节时,它们只能处理Unicode类编码。换而言之,他们不支持cp936编码。

  下面是一个相关的例子--C 源程序(下载源代码中包含了生成的pdf文件 –PDFlib_cs3.pdf)。

  /*******************************************************************/

  /* 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", "myi@pdflib.com");

  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;

  }

 

 


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