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一、使用PDFLib操作PDF文件
PDFLib是用于创建PDF文档的开发库，提供了简单易用的API，隐藏了创建PDF的复杂细节且不需要第3方软件的支持。PDFLib库对于个人是免费的，对于商业产品需要购买许可。
https://www.pdflib.com/
使用PDFLib库引用头文件和库文件
#include "PDFLib\PDFLib.hpp"
#pragma comment(lib, "PDFLib\\PDFLib.lib")
1.pdf常用操作
#define RADIUS 200.0f
#define MARGIN 20.0f
void CFilePdfDemoDlg::OnBtnPdfCreate()
{
PDFlib pdf;
//设置兼容参数
pdf.set_parameter("compatibility", "1.4");
//打开文档
if (-1 == pdf.open("PdfTest.pdf"))
{
MessageBox("打开文件出错！");
return;
}
//设置文档信息
pdf.set_info("Creator","PDF Creator");
pdf.set_info("Author","test");
pdf.set_info("Title","Convert to PDF");
pdf.set_info("Subject","PDF Creator");
pdf.set_info("Keywords","vckbase.com");
//开始A4页面
pdf.begin_page(a4_width,a4_height);
//设置字体为12号宋体
int font_song = pdf.findfont("STSong-Light","GB-EUC-H",0);
int font = pdf.findfont("Arial","host", 0);
pdf.setfont(font_song,12);
//设置起始点
pdf.set_text_pos(50,a4_height-50);
//设置颜色为蓝色
pdf.setcolor("fill","rgb",0,0,1,0);
//输出文字
pdf.show("pdf欢迎您!");
pdf.setcolor("fill","rgb",1,0,0,0);
pdf.setfont(font,24);
pdf.continue_text("this is just a test!");
//画两根绿线
pdf.setcolor("stroke", "rgb", 0.24f, 0.51f, 0.047f, 0);
pdf.moveto(50, a4_height - 80);
pdf.lineto(a4_width - 50, a4_height - 80);
pdf.moveto(50, a4_height - 78);
pdf.lineto(a4_width - 50, a4_height - 78);
pdf.stroke();
//填充一个蓝色方框
pdf.setcolor("fill", "rgb", 0.04f, 0.24f, 0.62f, 0);
pdf.rect(50, 50, a4_width - 100, 70);
pdf.fill();
//在指定位置输出文字
pdf.setcolor("fill", "rgb", 1, 1, 1, 0);
pdf.setfont(font_song, 16);
pdf.show_xy("啦啦啦", a4_width - 150, 60);
//打开并显示一个图像
int img = pdf.open_image_file("jpeg", "test.jpg", "", 0);
pdf.place_image(img, 200, 400, 1);
pdf.close_image(img);
//添加附件
//宽度 高度 x坐标 Y坐标 附件名称 描述 作者 后缀名 图标
pdf.attach_file(a4_width - 300, 0, 0, a4_height - 400, "test.rar", "description", "author", "zip", "paperclip");
//结束本页
pdf.end_page();
//关闭PDF文件
pdf.close();
MessageBox("PdfTest.pdf成功生成!");
}
2.去除水印
最简单也是最直接的方法下载破解版的PDFLib，下载PDFLib-9.1.2-win32。解压缩后，将pdflib中的pdflib.dll pdflib.lib pdflib.h拷贝到项目文件中。并且在VS项目属性->附加依赖项中加入pdflib.lib
3.显示中文字符
PDFlib-CMap为了用PDFlib创建中文，日文或韩文（CJK）文本输出并使用其中一个预定义的CMaps。下载PDFlib-CMap-3.0，并解压缩到任何路径，但是必须在使用时配置CMap文件路径，
p.set_option("SearchPath=/path/to/resource/cmap"); or PDF_set_option(p,"SearchPath=/path/to/resource/cmap")使用最常用的宋体STSong-Light（PDFLib自带的中文字体），解码方式是 GB-EUC-H（在cmap中）
#include <stdio.h>
#include<iostream>
#include "pdflib.h"
int main(int argc, char *argv[])
{
PDF *pdf = PDF_new();
// 打开文档
if (PDF_begin_document(pdf, "d://hello.pdf", 0, "") == -1)
{
printf("Error: %sn", PDF_get_errmsg(pdf));
return(0);
}
PDF_TRY(pdf)
{
PDF_set_option(pdf, "SearchPath=./PDFlib-CMap-3.0/resource/cmap");//配置cmap
PDF_set_info(pdf, "Creator", "PDF Creator");
PDF_set_info(pdf, "Title", "Convert to PDF");
PDF_begin_page_ext(pdf, a4_width, a4_height, "");// 开始A4页面
int nHeight = a4_height;//当前高度
int font_song = PDF_load_font(pdf, "STSong-Light", 0, "GB-EUC-H", "");
PDF_setfont(pdf, font_song, 34);// 设置字体为34号宋体
// 设置起始点
nHeight -= 50;
PDF_set_text_pos(pdf, 50, nHeight);
// 设置颜色为蓝色
PDF_setcolor(pdf, "fill", "rgb", 0, 0, 1, 0);
static const char *DFTitle[] = { "你好!", "中国。" };
for (int i = 0; i < 2; i++)
{
PDF_set_text_pos(pdf, 100* i, nHeight-40*i);//字体坐标
PDF_show(pdf, DFTitle[i]);
}
}
PDF_CATCH(pdf)
{
printf("PDFlib exception occurred in sample:/n");
printf("[%d] %s: %s/n",
PDF_get_errnum(pdf), PDF_get_apiname(pdf), PDF_get_errmsg(pdf));
}
PDF_end_page_ext(pdf, "");// 结束本页
PDF_end_document(pdf, "");// 关闭PDF文件
PDF_delete(pdf);
return 0;
}
二、使用Libharu库操作PDF文件
Libharu库是使用c语言来生成pdf文件的库。在编译libharu需要用到zlib库和libpng库（libpng 依赖于zlib库）。
zlib 下载地址：http://www.zlib.net/
libpng下载地址：http://www.libpng.org/pub/png/libpng.html
libharu下载地址：https://github.com/libharu/libharu
//测试实例代码
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <setjmp.h>
#include "hpdf.h"
const char *text = "This PDF should have an attachment named attach.c";
jmp_buf env;
#if defined(WIN32) || defined(_WIN64)
#pragma warning (disable: 4996) //_s //declared deprecated ?
#endif
#ifdef HPDF_DLL
void __stdcall
#else
void
#endif
error_handler(HPDF_STATUS error_no,
HPDF_STATUS detail_no,
void *user_data)
{
printf("ERROR: error_no=%04X, detail_no=%u\n", (HPDF_UINT)error_no,
(HPDF_UINT)detail_no);
longjmp(env, 1);
}
int
main(int argc, char **argv)
{
HPDF_Doc pdf;
HPDF_Font font;
HPDF_Page page;
char fname[256];
HPDF_REAL tw;
strcpy(fname, argv[0]);
strcat(fname, ".pdf");
pdf = HPDF_New(error_handler, NULL);
if (!pdf) {
printf("error: cannot create PdfDoc object\n");
return 1;
}
if (setjmp(env)) {
HPDF_Free(pdf);
return 1;
}
/* create default-font */
font = HPDF_GetFont(pdf, "Helvetica", NULL);
/* add a new page object. */
page = HPDF_AddPage(pdf);
HPDF_Page_SetSize(page, HPDF_PAGE_SIZE_LETTER, HPDF_PAGE_PORTRAIT);
HPDF_Page_BeginText(page);
HPDF_Page_SetFontAndSize(page, font, 20);
tw = HPDF_Page_TextWidth(page, text);
HPDF_Page_MoveTextPos(page, (HPDF_Page_GetWidth(page) - tw) / 2,
(HPDF_Page_GetHeight(page) - 20) / 2);
HPDF_Page_ShowText(page, text);
HPDF_Page_EndText(page);
/* attach a file to the document */
//HPDF_AttachFile(pdf, "attach.c");
//HPDF_AttachFile(pdf, "jpeg_demo.c");
/* save the document to a file */
HPDF_SaveToFile(pdf, fname);
/* clean up */
HPDF_Free(pdf);
return 0;
}//pdf 中文字体生成，及字体旋转代码
/*
* << Haru Free PDF Library 2.0.0 >> -- text_demo.c
*
* Copyright (c) 1999-2006 Takeshi Kanno <[email protected]>
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation.
* It is provided "as is" without express or implied warranty.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <setjmp.h>
#include "hpdf.h"
#include "grid_sheet.h"
jmp_buf env;
#ifdef HPDF_DLL
void __stdcall
#else
void
#endif
error_handler (HPDF_STATUS error_no,
HPDF_STATUS detail_no,
void *user_data)
{
printf ("ERROR: error_no=%04X, detail_no=%u\n", (HPDF_UINT)error_no,
(HPDF_UINT)detail_no);
longjmp(env, 1);
}
void
show_stripe_pattern (HPDF_Page page,
HPDF_REAL x,
HPDF_REAL y)
{
HPDF_UINT iy = 0;
while (iy < 50) {
HPDF_Page_SetRGBStroke (page, 0.0, 0.0, 0.5);
HPDF_Page_SetLineWidth (page, 1);
HPDF_Page_MoveTo (page, x, y + iy);
HPDF_Page_LineTo (page, x + HPDF_Page_TextWidth (page, "ABCabc123"),
y + iy);
HPDF_Page_Stroke (page);
iy += 3;
}
HPDF_Page_SetLineWidth (page, 2.5);
}
void
show_description (HPDF_Page page,
HPDF_REAL x,
HPDF_REAL y,
const char *text)
{
float fsize = HPDF_Page_GetCurrentFontSize (page);
HPDF_Font font = HPDF_Page_GetCurrentFont (page);
HPDF_RGBColor c = HPDF_Page_GetRGBFill (page);
HPDF_Page_BeginText (page);
HPDF_Page_SetRGBFill (page, 0, 0, 0);
HPDF_Page_SetTextRenderingMode (page, HPDF_FILL);
HPDF_Page_SetFontAndSize (page, font, 10);
HPDF_Page_TextOut (page, x, y - 12, text);
HPDF_Page_EndText (page);
HPDF_Page_SetFontAndSize (page, font, fsize);
HPDF_Page_SetRGBFill (page, c.r, c.g, c.b);
}
int main (int argc, char **argv)
{
const char *page_title = "Text Demo";
HPDF_Doc pdf;
HPDF_Font font;
HPDF_Page page;
char fname[256];
const char* samp_text = "abcdefgABCDEFG123!#$%&+-@?";
const char* samp_text2 = "The quick brown fox jumps over the lazy dog.";
float tw;
float fsize;
int i;
int len;
float angle1;
float angle2;
float rad1;
float rad2;
float ypos;
strcpy (fname, argv[0]);
strcat (fname, ".pdf");
pdf = HPDF_New (error_handler, NULL);
if (!pdf) {
printf ("error: cannot create PdfDoc object\n");
return 1;
}
if (setjmp(env)) {
HPDF_Free (pdf);
return 1;
}
/* set compression mode */
HPDF_SetCompressionMode (pdf, HPDF_COMP_ALL);
/* create default-font */
font = HPDF_GetFont (pdf, "Helvetica", NULL);
/* add a new page object. */
page = HPDF_AddPage (pdf);
/* draw grid to the page */
print_grid (pdf, page);
/* print the lines of the page.
HPDF_Page_SetLineWidth (page, 1);
HPDF_Page_Rectangle (page, 50, 50, HPDF_Page_GetWidth(page) - 100,
HPDF_Page_GetHeight (page) - 110);
HPDF_Page_Stroke (page);
*/
/* print the title of the page (with positioning center). */
HPDF_Page_SetFontAndSize (page, font, 24);
tw = HPDF_Page_TextWidth (page, page_title);
HPDF_Page_BeginText (page);
HPDF_Page_TextOut (page, (HPDF_Page_GetWidth(page) - tw) / 2,
HPDF_Page_GetHeight (page) - 50, page_title);
HPDF_Page_EndText (page);
HPDF_Page_BeginText (page);
HPDF_Page_MoveTextPos (page, 60, HPDF_Page_GetHeight(page) - 60);
/*
* font size
*/
fsize = 8;
while (fsize < 60) {
char buf[50];
int len;
/* set style and size of font. */
HPDF_Page_SetFontAndSize(page, font, fsize);
/* set the position of the text. */
HPDF_Page_MoveTextPos (page, 0, -5 - fsize);
/* measure the number of characters which included in the page. */
strcpy(buf, samp_text);
len = HPDF_Page_MeasureText (page, samp_text,
HPDF_Page_GetWidth(page) - 120, HPDF_FALSE, NULL);
/* truncate the text. */
buf[len] = 0x00;
HPDF_Page_ShowText (page, buf);
/* print the description. */
HPDF_Page_MoveTextPos (page, 0, -10);
HPDF_Page_SetFontAndSize(page, font, 8);
#ifdef __WIN32__
_snprintf(buf, 50, "Fontsize=%.0f", fsize);
#else
snprintf(buf, 50, "Fontsize=%.0f", fsize);
#endif
HPDF_Page_ShowText (page, buf);
fsize *= 1.5;
}
/*
* font color
*/
HPDF_Page_SetFontAndSize(page, font, 8);
HPDF_Page_MoveTextPos (page, 0, -30);
HPDF_Page_ShowText (page, "Font color");
HPDF_Page_SetFontAndSize (page, font, 18);
HPDF_Page_MoveTextPos (page, 0, -20);
len = strlen (samp_text);
for (i = 0; i < len; i++) {
char buf[2];
float r = (float)i / (float)len;
float g = 1 - ((float)i / (float)len);
buf[0] = samp_text[i];
buf[1] = 0x00;
HPDF_Page_SetRGBFill (page, r, g, 0.0);
HPDF_Page_ShowText (page, buf);
}
HPDF_Page_MoveTextPos (page, 0, -25);
for (i = 0; i < len; i++) {
char buf[2];
float r = (float)i / (float)len;
float b = 1 - ((float)i / (float)len);
buf[0] = samp_text[i];
buf[1] = 0x00;
HPDF_Page_SetRGBFill (page, r, 0.0, b);
HPDF_Page_ShowText (page, buf);
}
HPDF_Page_MoveTextPos (page, 0, -25);
for (i = 0; i < len; i++) {
char buf[2];
float b = (float)i / (float)len;
float g = 1 - ((float)i / (float)len);
buf[0] = samp_text[i];
buf[1] = 0x00;
HPDF_Page_SetRGBFill (page, 0.0, g, b);
HPDF_Page_ShowText (page, buf);
}
HPDF_Page_EndText (page);
ypos = 450;
/*
* Font rendering mode
*/
HPDF_Page_SetFontAndSize(page, font, 32);
HPDF_Page_SetRGBFill (page, 0.5, 0.5, 0.0);
HPDF_Page_SetLineWidth (page, 1.5);
/* PDF_FILL */
show_description (page, 60, ypos,
"RenderingMode=PDF_FILL");
HPDF_Page_SetTextRenderingMode (page, HPDF_FILL);
HPDF_Page_BeginText (page);
HPDF_Page_TextOut (page, 60, ypos, "ABCabc123");
HPDF_Page_EndText (page);
/* PDF_STROKE */
show_description (page, 60, ypos - 50,
"RenderingMode=PDF_STROKE");
HPDF_Page_SetTextRenderingMode (page, HPDF_STROKE);
HPDF_Page_BeginText (page);
HPDF_Page_TextOut (page, 60, ypos - 50, "ABCabc123");
HPDF_Page_EndText (page);
/* PDF_FILL_THEN_STROKE */
show_description (page, 60, ypos - 100,
"RenderingMode=PDF_FILL_THEN_STROKE");
HPDF_Page_SetTextRenderingMode (page, HPDF_FILL_THEN_STROKE);
HPDF_Page_BeginText (page);
HPDF_Page_TextOut (page, 60, ypos - 100, "ABCabc123");
HPDF_Page_EndText (page);
/* PDF_FILL_CLIPPING */
show_description (page, 60, ypos - 150,
"RenderingMode=PDF_FILL_CLIPPING");
HPDF_Page_GSave (page);
HPDF_Page_SetTextRenderingMode (page, HPDF_FILL_CLIPPING);
HPDF_Page_BeginText (page);
HPDF_Page_TextOut (page, 60, ypos - 150, "ABCabc123");
HPDF_Page_EndText (page);
show_stripe_pattern (page, 60, ypos - 150);
HPDF_Page_GRestore (page);
/* PDF_STROKE_CLIPPING */
show_description (page, 60, ypos - 200,
"RenderingMode=PDF_STROKE_CLIPPING");
HPDF_Page_GSave (page);
HPDF_Page_SetTextRenderingMode (page, HPDF_STROKE_CLIPPING);
HPDF_Page_BeginText (page);
HPDF_Page_TextOut (page, 60, ypos - 200, "ABCabc123");
HPDF_Page_EndText (page);
show_stripe_pattern (page, 60, ypos - 200);
HPDF_Page_GRestore (page);
/* PDF_FILL_STROKE_CLIPPING */
show_description (page, 60, ypos - 250,
"RenderingMode=PDF_FILL_STROKE_CLIPPING");
HPDF_Page_GSave (page);
HPDF_Page_SetTextRenderingMode (page, HPDF_FILL_STROKE_CLIPPING);
HPDF_Page_BeginText (page);
HPDF_Page_TextOut (page, 60, ypos - 250, "ABCabc123");
HPDF_Page_EndText (page);
show_stripe_pattern (page, 60, ypos - 250);
HPDF_Page_GRestore (page);
/* Reset text attributes */
HPDF_Page_SetTextRenderingMode (page, HPDF_FILL);
HPDF_Page_SetRGBFill (page, 0, 0, 0);
HPDF_Page_SetFontAndSize(page, font, 30);
/*
* Rotating text
*/
angle1 = 30; /* A rotation of 30 degrees. */
rad1 = angle1 / 180 * 3.141592; /* Calcurate the radian value. */
show_description (page, 320, ypos - 60, "Rotating text");
HPDF_Page_BeginText (page);
HPDF_Page_SetTextMatrix (page, cos(rad1), sin(rad1), -sin(rad1), cos(rad1),
330, ypos - 60);
HPDF_Page_ShowText (page, "ABCabc123");
HPDF_Page_EndText (page);
/*
* Skewing text.
*/
show_description (page, 320, ypos - 120, "Skewing text");
HPDF_Page_BeginText (page);
angle1 = 10;
angle2 = 20;
rad1 = angle1 / 180 * 3.141592;
rad2 = angle2 / 180 * 3.141592;
HPDF_Page_SetTextMatrix (page, 1, tan(rad1), tan(rad2), 1, 320, ypos - 120);
HPDF_Page_ShowText (page, "ABCabc123");
HPDF_Page_EndText (page);
/*
* scaling text (X direction)
*/
show_description (page, 320, ypos - 175, "Scaling text (X direction)");
HPDF_Page_BeginText (page);
HPDF_Page_SetTextMatrix (page, 1.5, 0, 0, 1, 320, ypos - 175);
HPDF_Page_ShowText (page, "ABCabc12");
HPDF_Page_EndText (page);
/*
* scaling text (Y direction)
*/
show_description (page, 320, ypos - 250, "Scaling text (Y direction)");
HPDF_Page_BeginText (page);
HPDF_Page_SetTextMatrix (page, 1, 0, 0, 2, 320, ypos - 250);
HPDF_Page_ShowText (page, "ABCabc123");
HPDF_Page_EndText (page);
/*
* char spacing, word spacing
*/
show_description (page, 60, 140, "char-spacing 0");
show_description (page, 60, 100, "char-spacing 1.5");
show_description (page, 60, 60, "char-spacing 1.5, word-spacing 2.5");
HPDF_Page_SetFontAndSize (page, font, 20);
HPDF_Page_SetRGBFill (page, 0.1, 0.3, 0.1);
/* char-spacing 0 */
HPDF_Page_BeginText (page);
HPDF_Page_TextOut (page, 60, 140, samp_text2);
HPDF_Page_EndText (page);
/* char-spacing 1.5 */
HPDF_Page_SetCharSpace (page, 1.5);
HPDF_Page_BeginText (page);
HPDF_Page_TextOut (page, 60, 100, samp_text2);
HPDF_Page_EndText (page);
/* char-spacing 1.5, word-spacing 3.5 */
HPDF_Page_SetWordSpace (page, 2.5);
HPDF_Page_BeginText (page);
HPDF_Page_TextOut (page, 60, 60, samp_text2);
HPDF_Page_EndText (page);
/* save the document to a file */
HPDF_SaveToFile (pdf, fname);
/* clean up */
HPDF_Free (pdf);
return 0;
}libHaru在windows下的编译，参考https://www.cnblogs.com/nightnine/p/8947379.html
libHaru的坐标系统、图形模式介绍，参考：https://blog.csdn.net/anobodykey/article/details/63683843
三、libharu和pdflib 两种写pdf库文件比较
pdflib 8.0版本使用后发现存在如下问题：
1.只能在第一页中进行操作，不能生产后续页面；
2.使用中文有问题，在4.0的版本下能使用，但是在8.0版本下中文无法正常使用；
3.最大的问题，由于需要收费，生成的pdf页面背景有水印，这是无法忍受的。
前面2个问题，可能有办法解决，由于时间关系没有更多去研究。
libharu版本可以解决上述的问题。具体使用时需要注意如下几点：
1.在使用中文时，一定要先申明使用的字体和编码为中文，及需要加上HPDF_UseCNSFonts();HPDF_UseCNTFonts();HPDF_UseCNTEncodings();HPDF_UseCNSEncodings()这四句话。
2.用HPDF_GetFont来使用中文字体时，第二个参数发现只能使用"SimSun"和"SimHei"这2种字体，即宋体和黑体两种字体，而且还只能是这种写法，其它像"SIMSUN"、"SIMHEI"这些写法都会抛出异常。不知道是不是老外没有将更多通用的字体加到库中，不过也知足了，总算能将中文正常显示出来了。
3.可以使用HPDF_AddPage()来生成后续页面，HPDF_Page_MoveToNextLine()来换行。
4.对于具体内容的输出，输出的字符一定要是带\x00结尾的字符，不然pdf中会有很多的乱字符出现。
5.HPDF_Page_MoveTextPos()将输出光标移动到某个位置，需要注意的地方，纵坐标是从页面的最下方开始算的，这点和一般的坐标起始点不一样。