C++遍历目录与图片格式识别-优快云博客

本文介绍了一个使用C++实现的目录结构遍历程序，能够识别并列出特定图片格式（如jpg、png、bmp）的文件。程序利用了标准输入输出流、文件系统类型、目录读取及文件状态等API，展示了如何在文件系统中查找指定类型的文件。

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 1 #include <iostream>
 2 #include <sys/types.h>
 3 #include <dirent.h>
 4 #include <sys/stat.h>
 5 #include <string.h>
 6 
 7 using namespace std;
 8 char *s1="jpg";
 9 char *s2="png";
10 char *s3="bmp";
11 /***************************
12  * 函数功能: 遍历文件夹
13  * return: void
14  * @para folderPath: 文件夹路径
15 ***************************/
16 void showDirStructure(char *folderPath)
17 {
18     /********** BEGIN **********/
19     static int begins = 1;
20     if(begins){
21         cout<<"+--";
22         int spoint = -1;
23         int n = strlen(folderPath);
24         for(int i=0;i<n;i++){
25             if(folderPath[i]=='/')
26                 spoint = i;
27         }
28         spoint += 1;
29         cout<<(folderPath+spoint)<<endl;
30         begins = 0;
31     }
32     static int gs = 2;
33     DIR* point = opendir(folderPath);
34     dirent* readdirs = readdir(point);
35     while(readdirs!=NULL){
36         if(readdirs->d_name[0]=='.'&&readdirs->d_name[1]==0){
37             readdirs = readdir(point);
38             continue;
39         }
40         if(readdirs->d_name[0]=='.'&&readdirs->d_name[1]=='.'&&readdirs->d_name[2]==0){
41             readdirs = readdir(point);
42             continue;
43         }
44         int check = 1;
45         int pointd = -1;
46         int n = strlen(readdirs->d_name);
47         for(int i=0;i<n;i++){
48             if(readdirs->d_name[i]=='.')
49                 pointd = i;
50         }
51         pointd+=1;
52         int okk = 0;
53         if(pointd!=0){
54             if(strcmp((readdirs->d_name+pointd),s1)==0)
55                 okk = 1;
56             if(strcmp((readdirs->d_name+pointd),s2)==0)
57                 okk = 1;
58             if(strcmp((readdirs->d_name+pointd),s3)==0)
59                 okk = 1;
60         }
61         struct stat buf;
62         char *s = new char[266];
63         int i = 0;
64         while(folderPath[i]!=0) {s[i] = folderPath[i];i+=1;}
65         s[i]='/';i+=1;
66         int j = 0;
67         while(readdirs->d_name[j]!=0){s[i] = readdirs->d_name[j];i+=1;j+=1;}
68         s[i] = 0;
69         stat(s,&buf);
70         if(S_ISDIR(buf.st_mode)){
71             for(int i=0;i<gs;i++) cout<<' ';
72             cout<<"+--";
73             cout<<readdirs->d_name<<endl;
74             gs+=2;
75             showDirStructure(s);
76             gs-=2;
77         }
78         else if(okk){
79             for(int i=0;i<gs;i++) cout<<' ';
80             cout<<"--";
81             cout<<readdirs->d_name<<endl;
82         }
83         readdirs = readdir(point);
84     }
85     closedir(point);
86     /********** END **********/
87 }