敬业的IT人 互联网 佚名 2008-1-4 18:37:27

PDFlib的textformat参数用以设定文本输入形式，其有效值如下:

bytes: 在字符串中每个字节对应于一个字符。主要应用于8位编码。
utf8：字符串是 UTF-8编码。
ebcdicutf8：字符串是EBCDIC的UTF-8编码，只应用于IBM iSeries和zSeries。
utf16：字符串是 UTF-16编码。如果字符串是以Unicode的标记字节顺序号(BOM)开始，PDFlib会接收BOM信息后将其从字符串首移去。如果字符串不带BOM，字符串的字节顺序将取决于主机的字节顺序。Intel x86系统是小尾（little-endian，0xFFFE ）, 而Sparc和PowerPC系统是大尾（big-endian, 0xFEFF)。
utf16be：字符串是大尾字节顺序的UTF-16编码。对BOM没有特殊处理。
utf16le：字符串是小尾字节顺序的UTF-16编码。对BOM没有特殊处理。
auto:对于8位编码，它相当于“bytes”, 对于宽字符字符串(Unicode, glyphid, UCS2 或UTF16 CMap)，它相当于“utf16”。

在编程语言里，我们将可以自动处理Unicode字符串的语言称为支持Unicode语言（Unicode-capable），它们是COM, .NET, Java, REALbasic及Tcl等。对于需对Unicode字符串进行特殊处理的语言称为不支持Unicode语言（non-Unicode-capable），它们是C, C , Cobol, Perl, PHP, Python 及RPG等。
在non-Unicode-capable语言里，“auto”设置将会正确处理大部分文本字符串。
对于Unicode-capable语言，textformat参数的缺省值是“utf16”；而non-Unicode-capable语言的缺省值是“auto”。
除此之外，PDFlib还支持在SGML和HTML经常使用的字符引用方法（Character Reference）。前提是将参数charref设成真, textformat设成“bytes”:

PDF_set_parameter(p, "charref", "true");PDF_set_parameter(p, "textformat", "bytes");

下面给出一些有效的Character Reference:
­ soft hyphen
­ soft hyphen
­ soft hyphen
€ Euro glyph (hexadecimal)
€ Euro glyph (decimal)
€ Euro glyph (entity name)
< less than sign
> greater than sign
& ampersand sign
Α Greek Alpha

下面是一个相关的例子--C 源程序(附上生成的pdf文件 –PDFlib_cs4.pdf)。

/*******************************************************************//* This example demostrates output Chinese Simplified text with different/* 'textformat' option under Chinese Simplifed Windows./*******************************************************************/#include <stdio.h>#include <stdlib.h>#include <string.h>#include "pdflib.h"int main(void){PDF             *p = NULL;int                 Font_E = 0, Font_H = 0, Font_CS = 0, Left = 50, y = 800, i = 0;const int       INCRY = 25;char              text[128], buf[128];/* 1 byte text (English: "Simplified Chinese") */static const char byte_text[] ="\123\151\155\160\154\151\146\151\145\144\040\103\150\151\156\145\163\145";static const int byte_len = 18;static const char byte2_text[] = {0x53,0x69,0x6D,0x70,0x6C,0x69,0x66,0x69,0x65,0x64,0x20,0x43,0x68,0x69,0x6E,0x65,0x73,0x65};static const int byte2_len = 18;/* 2 byte text (Simplified Chinese) */static const unsigned short utf16_text[] = {0x7B80,0x4F53,0x4E2D,0x6587};static const int utf16_len = 8;static const unsigned char utf16be_text[] ="\173\200\117\123\116\055\145\207";static const int utf16be_len = 8;static const unsigned char utf16be_bom_text[] = "\376\377\173\200\117\123\116\055\145\207";static const int utf16be_bom_len = 10;static const unsigned char utf16le_text[] ="\200\173\123\117\055\116\207\145";static const int utf16le_len = 8;static const unsigned char utf16le_bom_text[] = "\377\376\200\173\123\117\055\116\207\145";static const int utf16le_bom_len = 10;static const unsigned char utf8_text[] = "\347\256\200\344\275\223\344\270\255\346\226\207";static const int utf8_len = 12;static const unsigned char utf8_bom_text[] = "\xEF\xBB\xBF\xE7\xAE\x80\xE4\xBD\x93\xE4\xB8\xAD\xE6\x96\x87";static const int utf8_bom_len = 15;static const char htmlutf16_text[] = "简体中文";static const int htmlutf16_len = sizeof(htmlutf16_text) - 1;typedef struct{char *textformat;char *encname;const char *textstring;const int  *textlength;const char *bomkind;} TestCase;static const TestCase table_8[] = {{ "bytes",      "winansi",  (const char *)byte_text,         &byte_len,      ""},{ "auto",        "winansi",  (const char *)byte_text,         &byte_len,      ""},{ "bytes",      "winansi",  (const char *)byte2_text,       &byte2_len,     ""}, };static const TestCase table_16[] =  {{ "auto",  "unicode",  (const char *)utf16_text,       &utf16_len,      ""},{ "utf16", "unicode",  (const char *)utf16_text,       &utf16_len,      ""},{ "auto",  "unicode",  (const char *)utf16be_bom_text, &utf16be_bom_len, ", UTF-16 BE-BOM"},{ "auto",     "unicode",     (const char *)utf16le_bom_text, &utf16le_bom_len, ", UTF-16 LE-BOM"},{ "utf16be", "unicode",    (const char *)utf16be_text,         &utf16be_len,    ""},{ "utf16le",   "unicode",   (const char *)utf16le_text,           &utf16le_len,    ""},{ "utf8",       "unicode",    (const char *)utf8_text,               &utf8_len,       ""},{ "auto",       "unicode",   (const char *)utf8_bom_text,      &utf8_bom_len, ", UTF-8 BOM"},{ "bytes", "unicode",   (const char *)htmlutf16_text, &htmlutf16_len, ", HTML unicode character"}, };const int   tsize_8 = sizeof table_8 / sizeof (TestCase);const int   tsize_16 = sizeof table_16 / sizeof (TestCase);/* 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_cs4.pdf", 0, "") == -1){printf("Error: %s\n", PDF_get_errmsg(p));return(2);}PDF_set_info(p, "Creator", "pdflib_cs4.c");PDF_set_info(p, "Author", "myi@pdflib.com");PDF_set_info(p, "Title", "Output Chinese Simplify with Different textformat");/* Start a new page. */PDF_begin_page_ext(p, a4_width, a4_height, "");Font_H = PDF_load_font(p, "Helvetica-Bold", 0, "winansi", "");/* 8-bit encoding */Font_E = PDF_load_font(p, "Times", 0, "winansi", "");PDF_setfont(p, Font_H, 24);PDF_show_xy(p, "8-bit encoding", Left 40,  y);y -= 2*INCRY;for (i = 0; i < tsize_8;   i){PDF_setfont(p, Font_H, 14);sprintf(text, "%s encoding, %s textformat %s: ", table_8[i].encname,table_8[i].textformat, table_8[i].bomkind);PDF_show_xy(p, text, Left,  y);y -= INCRY;PDF_set_parameter(p, "textformat", table_8[i].textformat);PDF_setfont(p, Font_E, 14);PDF_show_xy(p, table_8[i].textstring, Left,  y);y -= INCRY;} /* for *//* 16-bit encoding */PDF_setfont(p, Font_H, 24);y -= 2*INCRY;PDF_show_xy(p, "16-bit encoding", Left 40,  y);y -= 2*INCRY;PDF_set_parameter(p, "charref", "true");Font_CS = PDF_load_font(p, "STSong-Light", 0, "UniGB-UCS2-H", "");for (i = 0; i < tsize_16; i  ){PDF_setfont(p, Font_H, 14);sprintf(text, "%s encoding, %s textformat %s: ", table_16[i].encname,table_16[i].textformat, table_16[i].bomkind);PDF_show_xy(p, text, Left,  y);y -= INCRY;PDF_setfont(p, Font_CS, 14);sprintf(buf, "textformat %s",table_16[i].textformat);PDF_fit_textline(p, table_16[i].textstring, *table_16[i].textlength,Left, y, buf);y -= INCRY;} /* for *//* End of page. */PDF_end_page_ext(p, "");PDF_end_document(p, "");}PDF_CATCH(p) {printf("PDFlib exception occurred in pdflib_cs4 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;}

相关链接:

PDFLIB官方网站: http://www.pdflib.com
PDFLIB官方下载专页:http://www.pdflib.com/products/pdflib/download/index.html
VC知识库PDFLIB下载:http://www.vckbase.com/tools

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