pdflib_pdflib 表单_acrobat pdf sdk(4)

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\x";        /* 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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