|
|
@@ -0,0 +1,147 @@
|
|
|
+#include "dwg_thumbnail.h"
|
|
|
+#include <stdio.h>
|
|
|
+#include <stdlib.h>
|
|
|
+#include <string.h>
|
|
|
+#include <regex>
|
|
|
+#include <string>
|
|
|
+#include <atlimage.h>
|
|
|
+
|
|
|
+using std::string;
|
|
|
+
|
|
|
+bool dwg_getbmp(const char *dwgfile, const char *thumb_bmpfile) {
|
|
|
+ FILE *fd = fopen(dwgfile, "rb");
|
|
|
+ if (fd == NULL) {
|
|
|
+// fprintf(stderr, "无法打开文件\n");
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+
|
|
|
+ fseek(fd, 13, SEEK_SET);
|
|
|
+ unsigned int sentinel_pos;
|
|
|
+ fread(&sentinel_pos, sizeof(unsigned int), 1, fd);
|
|
|
+ // printf("Hex: %X\n", sentinel_pos);
|
|
|
+
|
|
|
+ const int SIZE_SN = 39;
|
|
|
+
|
|
|
+ char buf[SIZE_SN] = {0};
|
|
|
+ unsigned char SN[] = {0x1F, 0x25, 0x6D, 0x07, 0xD4, 0x36, 0x28, 0x28,
|
|
|
+ 0x9D, 0x57, 0xCA, 0x3F, 0x9D, 0x44, 0x10, 0x2B};
|
|
|
+ fseek(fd, sentinel_pos, SEEK_SET);
|
|
|
+ fread(buf, SIZE_SN, 1, fd);
|
|
|
+
|
|
|
+ bool isdwg = true;
|
|
|
+ for (int i = 0; i != 16; i++) {
|
|
|
+ isdwg &= ((unsigned char)buf[i] == SN[i]);
|
|
|
+ }
|
|
|
+
|
|
|
+// if (isdwg && buf[20] == 2) {
|
|
|
+// for (int i = 0; i != sizeof(buf); i++)
|
|
|
+// printf("%0.2X ", buf[i] & 0xFF);
|
|
|
+// } else {
|
|
|
+// return false;
|
|
|
+// }
|
|
|
+
|
|
|
+ if (!isdwg && buf[20] != 2)
|
|
|
+ return false;
|
|
|
+
|
|
|
+ int data_size;
|
|
|
+ memcpy(&data_size, &buf[35], sizeof(int));
|
|
|
+
|
|
|
+ int pos;
|
|
|
+ memcpy(&pos, &buf[31], sizeof(int));
|
|
|
+
|
|
|
+ // printf("\ndata_size: 0x%0.4X", data_size);
|
|
|
+ // printf("\npos: 0x%0.4X\n", pos);
|
|
|
+
|
|
|
+ char *bmp_buf = new char[data_size];
|
|
|
+ memset(bmp_buf, 0, data_size);
|
|
|
+
|
|
|
+ fseek(fd, pos, SEEK_SET);
|
|
|
+ if (fread(bmp_buf, 1, data_size, fd) != data_size) {
|
|
|
+// fprintf(stderr, "读取失败\n");
|
|
|
+ delete[] bmp_buf;
|
|
|
+ fclose(fd);
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+
|
|
|
+ FILE *bmp_file = fopen(thumb_bmpfile, "wb");
|
|
|
+ if (bmp_file == NULL) {
|
|
|
+// fprintf(stderr, "无法创建文件\n");
|
|
|
+ delete[] bmp_buf;
|
|
|
+ fclose(fd);
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+ struct _BITMAP_HEADER {
|
|
|
+ char magic[2];
|
|
|
+ int file_size;
|
|
|
+ int reserved;
|
|
|
+ int offset;
|
|
|
+ } bmp_h;
|
|
|
+
|
|
|
+ /* Write bmp file header */
|
|
|
+ bmp_h.magic[0] = 'B';
|
|
|
+ bmp_h.magic[1] = 'M';
|
|
|
+ bmp_h.file_size = 14 + data_size; // file header + DIB data
|
|
|
+ bmp_h.reserved = 0;
|
|
|
+ bmp_h.offset = 14 + 40 + 4 * 256; // file header + DIB header + color table
|
|
|
+
|
|
|
+ // 写 BMP 文件头
|
|
|
+ fwrite(&bmp_h.magic[0], sizeof(char), 2, bmp_file);
|
|
|
+ fwrite(&bmp_h.file_size, 4, 3, bmp_file);
|
|
|
+
|
|
|
+ // 写bmp 图片数据
|
|
|
+ fwrite(bmp_buf, 1, data_size, bmp_file);
|
|
|
+
|
|
|
+ // printf ("Success. Written thumbnail image to '%s'\n", thumb_bmpfile);
|
|
|
+
|
|
|
+ delete[] bmp_buf;
|
|
|
+ fclose(fd);
|
|
|
+ fclose(bmp_file);
|
|
|
+ return true;
|
|
|
+}
|
|
|
+
|
|
|
+bool DWGThumbnail(const char* dwg_filename, const char* png_filename)
|
|
|
+{
|
|
|
+ string file_ext(dwg_filename);
|
|
|
+ string rs = "(.+)(\\.(?:dwg|DWG|Dwg|DWg|dWG))";
|
|
|
+ std::regex expression(rs);
|
|
|
+ bool ret = regex_match(file_ext, expression);
|
|
|
+ if (!ret) {
|
|
|
+ return ret ;
|
|
|
+ }
|
|
|
+
|
|
|
+ FILE* pfile = fopen(dwg_filename, "rb");
|
|
|
+ if(NULL == pfile){
|
|
|
+ // MessageBoxA(NULL, cdr_filename, "错误File", MB_OK);
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+
|
|
|
+ char temp_filename[128];
|
|
|
+ const char* tmpBmpFile = tmpnam(temp_filename);
|
|
|
+ strcat(temp_filename,".bmp");
|
|
|
+
|
|
|
+ ret = dwg_getbmp(dwg_filename , tmpBmpFile);
|
|
|
+
|
|
|
+ if (!ret)
|
|
|
+ return false ;
|
|
|
+
|
|
|
+ CImage image; // bmp 转换 png ，需要CImage类，头文件 atlimage.h
|
|
|
+ image.Load(tmpBmpFile);
|
|
|
+ image.Save(png_filename);
|
|
|
+
|
|
|
+ if (remove(tmpBmpFile) != 0)
|
|
|
+ perror("Error deleting file");
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+bool DWGThumbnail_W(const wchar_t* dwg_filename, const wchar_t* png_filename)
|
|
|
+{
|
|
|
+ char fromfile[MAX_PATH] = {0};
|
|
|
+ char tofile[MAX_PATH] = {0};
|
|
|
+ WCHARTochar(fromfile, dwg_filename);
|
|
|
+ WCHARTochar(tofile, png_filename);
|
|
|
+ bool ret = DWGThumbnail(fromfile, tofile);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+
|
