这是它的网站Index of Downloads (mupdf.com)
是开源的
下载这个文件， 还能当pdf阅读器使用
下载mupdf-1.18.0-source里面就是源代码
可以自己看看，里面有源代码，也有API帮助说明。自己研究一下
我这里就不多介绍了，直接上例子，
这个例子是我两年前百度找到的，一直在用，但是原文链接我已经找不到了。
1.新建个控制台项目
空项目，新建个main.cpp
2.设置
添加附加包含目录
附加库目录
附加依赖项.lib和.dll要自己拿源码去编译
编写hpp和cpp
#ifndef MY_MUPDF_CONVERT_PDF_PNG #define MY_MUPDF_CONVERT_PDF_PNG extern "C" { #include "mupdf/fitz.h" #include "mupdf/fitz-internal.h" } class CMuPDFConvert { public: CMuPDFConvert(void); ~CMuPDFConvert(void); bool Pdf2Png(const wchar_t* pdfFileName/*,const char* imageOutputPath*/,const char* imageName, int &pageNum); private: void drawpage(fz_context *ctx, fz_document *doc, int pagenum); private: static const fz_matrix fz_identity; static fz_colorspace k_device_rgb; fz_colorspace *fz_device_rgb; fz_document *m_doc; fz_stream *m_pStream; fz_context *m_ctx; int uselist; int alphabits; char output[1024]; float resolution; float rotation; int res_specified; int width; int height; int fit; fz_colorspace *colorspace; int savealpha; int invert; float gamma_value; char filename[1024]; }; #endif
#include "MuPDFConvert.h" void fz_free_colorspace_imp(fz_context *ctx, fz_storable *cs_) { fz_colorspace *cs = (fz_colorspace *)cs_; if (cs->free_data && cs->data) cs->free_data(ctx, cs); fz_free(ctx, cs); } static void rgb_to_rgb(fz_context *ctx, fz_colorspace *cs, float *rgb, float *xyz) { xyz[0] = rgb[0]; xyz[1] = rgb[1]; xyz[2] = rgb[2]; } const fz_matrix CMuPDFConvert::fz_identity = { 1, 0, 0, 1, 0, 0 }; fz_colorspace CMuPDFConvert::k_device_rgb = { {-1, fz_free_colorspace_imp}, 0, "DeviceRGB", 3, rgb_to_rgb, rgb_to_rgb }; CMuPDFConvert::CMuPDFConvert(void) { fz_device_rgb = &k_device_rgb; uselist = 1; alphabits = 8; //output = NULL; resolution = 72; rotation = 0; res_specified = 0; width = 0; height = 0; fit = 0; colorspace = NULL; savealpha = 0; invert = 0; gamma_value = 1; m_doc = NULL; m_ctx = NULL; } CMuPDFConvert::~CMuPDFConvert(void) { if (m_pStream) { fz_close(m_pStream); m_pStream = NULL; } if (m_doc) { fz_close_document(m_doc); m_doc = NULL; } if (m_ctx) { fz_free_context(m_ctx); m_ctx = NULL; } } bool CMuPDFConvert::Pdf2Png(const wchar_t* wcharPdfFile/*,const char* imageOutputPath*/,const char* imageName, int &pageNum) { char tempPath[1024]; //strcpy_s(tempPath, imageOutputPath); //strcat_s(tempPath, imageName); strcpy_s(tempPath, imageName); strcat_s(tempPath, "%d.png"); strcpy_s(output, (strlen(tempPath)+1)*sizeof(char), tempPath); m_ctx = fz_new_context(NULL, NULL, FZ_STORE_DEFAULT); if (!m_ctx) { #if _DEBUG fprintf(stderr, "mupdf cannot initialise context "); #endif return false; } fz_try(m_ctx) { fz_set_aa_level(m_ctx, alphabits); colorspace = fz_device_rgb; m_pStream = fz_open_file_w(m_ctx, wcharPdfFile); if (m_pStream) { m_doc = fz_open_document_with_stream(m_ctx, ".pdf", m_pStream); } if (!m_doc) { #if _DEBUG fprintf(stderr, "mupdf cannot open pdf "); #endif return false; } if (fz_needs_password(m_doc)) { #if _DEBUG fprintf(stderr, "mupdf cannot authenticate password "); fz_throw(m_ctx, "mupdf cannot authenticate password: %s", filename); #endif return false; } int pn = fz_count_pages(m_doc); pageNum = pn; for (int i=0; i<pn; ++i) { fz_page *page = fz_load_page(m_doc, i); fz_rect bound = fz_bound_page(m_doc, page); //PDF-->PNG drawpage(m_ctx, m_doc, i+1); fz_free_page(m_doc, page); page = NULL; } } fz_catch(m_ctx) { return false; } if (m_pStream) { fz_close(m_pStream); m_pStream = NULL; } if (m_doc) { fz_close_document(m_doc); m_doc = NULL; } if (m_ctx) { fz_free_context(m_ctx); m_ctx = NULL; } return true; } void CMuPDFConvert::drawpage(fz_context *ctx, fz_document *doc, int pagenum) { fz_page *page; fz_display_list *list = NULL; fz_device *dev = NULL; int start; fz_var(list); fz_var(dev); fz_try(ctx) { page = fz_load_page(doc, pagenum - 1); } fz_catch(ctx) { fz_throw(ctx, "cannot load page %d in file '%s'", pagenum, filename); } if (uselist) { fz_try(ctx) { list = fz_new_display_list(ctx); dev = fz_new_list_device(ctx, list); fz_run_page(doc, page, dev, fz_identity, NULL); } fz_catch(ctx) { fz_free_device(dev); fz_free_display_list(ctx, list); fz_free_page(doc, page); fz_throw(ctx, "cannot draw page %d in file '%s'", pagenum, filename); } fz_free_device(dev); dev = NULL; } if (output) { float zoom; fz_matrix ctm; fz_rect bounds, bounds2; fz_bbox bbox; fz_pixmap *pix = NULL; int w, h; fz_var(pix); bounds = fz_bound_page(doc, page); zoom = resolution / 72; ctm = fz_scale(zoom, zoom); ctm = fz_concat(ctm, fz_rotate(rotation)); bounds2 = fz_transform_rect(ctm, bounds); bbox = fz_round_rect(bounds2); /* Make local copies of our width/height */ w = width; h = height; /* If a resolution is specified, check to see whether w/h are * exceeded; if not, unset them. */ if (res_specified) { int t; t = bbox.x1 - bbox.x0; if (w && t <= w) w = 0; t = bbox.y1 - bbox.y0; if (h && t <= h) h = 0; } /* Now w or h will be 0 unless then need to be enforced. */ if (w || h) { float scalex = w/(bounds2.x1-bounds2.x0); float scaley = h/(bounds2.y1-bounds2.y0); if (fit) { if (w == 0) scalex = 1.0f; if (h == 0) scaley = 1.0f; } else { if (w == 0) scalex = scaley; if (h == 0) scaley = scalex; } if (!fit) { if (scalex > scaley) scalex = scaley; else scaley = scalex; } ctm = fz_concat(ctm, fz_scale(scalex, scaley)); bounds2 = fz_transform_rect(ctm, bounds); } bbox = fz_round_rect(bounds2); /* TODO: banded rendering and multi-page ppm */ fz_try(ctx) { pix = fz_new_pixmap_with_bbox(ctx, colorspace, bbox); if (savealpha) fz_clear_pixmap(ctx, pix); else fz_clear_pixmap_with_value(ctx, pix, 255); dev = fz_new_draw_device(ctx, pix); if (list) fz_run_display_list(list, dev, ctm, bbox, NULL); else fz_run_page(doc, page, dev, ctm, NULL); fz_free_device(dev); dev = NULL; if (invert) fz_invert_pixmap(ctx, pix); if (gamma_value != 1) fz_gamma_pixmap(ctx, pix, gamma_value); if (savealpha) fz_unmultiply_pixmap(ctx, pix); if (output) { char buf[512]; sprintf(buf, output, pagenum); if (strstr(output, ".png")) { fz_write_png(ctx, pix, buf, savealpha); } } fz_drop_pixmap(ctx, pix); } fz_catch(ctx) { fz_free_device(dev); fz_drop_pixmap(ctx, pix); fz_free_display_list(ctx, list); fz_free_page(doc, page); fz_rethrow(ctx); } } if (list) fz_free_display_list(ctx, list); fz_free_page(doc, page); fz_flush_warnings(ctx); }
// Pdf2Png.cpp : Defines the entry point for the console application. // #include "MuPDFConvert.h" int main() { //char*转wchar_t* char *CStr = "D:\1\test\test\test.pdf"; size_t len = strlen(CStr) + 1; size_t converted = 0; wchar_t *WStr; WStr=(wchar_t*)malloc(len*sizeof(wchar_t)); mbstowcs_s(&converted, WStr, len, CStr, _TRUNCATE); CMuPDFConvert pdfConvert; int nNum = 0; pdfConvert.Pdf2Png(WStr, "test", nNum); }
编译项目
将.dll动态链接库放到生成的exe目录里
执行演示
程序员阿飞
2021年4月29日
