所以我一直在寻找这段代码几个小时,我似乎无法理解发生了什么,尽管我努力用printf调试这个代码到处都是。以下功能是我的主要问题所在:
void drawFolders() {
printf("Going to call getSubFolder\n");
getSubFolders(".");
printf("DEBUG 1 - Return from getFolderName is: %s\n", getFolderName(3));
printf("DEBUG 2 - Return from getFolderName is: %s\n", getFolderName(5));
int k;
for(k = 0; k < getNumberFolders(); k++) {
printf("DEBUG INLOOP %d - Return from getFolderName is: %s\n",k, getFolderName(k));
draw_sprite(k*60 + 30, 50, folder);
//draw_string(temp[i].name,i*60 + 30, 50);
}
}
基本上,在DEBUG1和DEBUG2中,我的函数getFolderName()似乎工作正常,即返回一个没有问题的字符串。但是,当我尝试在for循环中调用此函数时,我从getFolderName获取的所有东西都是垃圾(除了第一个),即使k是3或5(我是这样的情况)在for循环之前测试并且工作正常)。 k也没错,因为我也打印它。 getFolderName对数组没有任何作用,这里是函数:
char* getFolderName(int index) {
printf("Values inside getFolderName() function : %s\n", currentFolders[index].name);
return currentFolders[index].name ;
}
显示currentFolders是非常重要的:
typedef struct Directories {
char* name;
int active;
} Directory;
Directory currentFolders[30];
输出
Dec 20 22:18:48 192 kernel: Vai chamar o getSubFolder
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: .
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: ..
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: usr
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: lab4
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: proj
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: bin
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: boot
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: dev
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: etc
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: home
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: mnt
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: root
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: sbin
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: tmp
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: var
Dec 20 22:18:48 192 kernel: DEBUG 0Values inside getFolderName() function : lab4
Dec 20 22:18:48 192 kernel: DEBUG 1 - Return from getFolderName is: lab4
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function : bin
Dec 20 22:18:48 192 kernel: DEBUG 2 - Return from getFolderName is: bin
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function : .
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 0 - Return from getFolderName is: .
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 1 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 2 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 3 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 4 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 5 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 6 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 7 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 8 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 9 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 10 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 11 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 12 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 13 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 14 - Return from getFolderName is:
我认为其他被称为问题的功能与此问题无关,但你可能想看一下,所以无论如何它都是:
int getSubFolders(char* foldername) {
num_folders = 0;
struct dirent *de=NULL;
DIR *d=NULL;
d=opendir(foldername);
if(d == NULL) {
perror("Couldn't open directory");
return(2);
}
int i = 0;
// Loop while not NULL
while(de = readdir(d)) {
num_folders++;
Directory temp;
currentFolders[i].name = de->d_name;
strcpy( currentFolders[i].name, de->d_name);
// printf("nome %s\n",de->d_name);
//printf("temp.name %s\n",temp.name);
// currentFolders[i] = temp;
printf("Values inside getSubFolders function: %s\n",currentFolders[i].name);
i++;
}
printCurrentFolders();
closedir(d);
return(0);
}
答案 0 :(得分:0)
以这种方式修复,结构声明它就像这个
typedef struct Directories {
char name[256];
int active;
} Directory;
并删除此行
currentFolders[i].name = de->d_name;
问题是由closedir(d);
清理opendir
使用的资源造成的,struct dirent *
是这些资源的一部分。