我想在C中以及在errno:2上的openFile
函数中进行错误检查:我想再次递归调用同一函数。
我没有正确的答案,如果我想在打开文件后执行fputs(),则会收到错误消息(错误的文件描述符)
这是我的代码:
void openFile(FILE **fstream, char* path, char* mode) {
*fstream = fopen(path, mode);
if(*fstream == NULL) {
printf("\nError number %2d : ",errno);
perror("Error opening file: ");
switch (errno) {
case 2:
printf("Creating file %s now...\n", path);
*fstream = fopen(path, "a+"); //Creating file in append-mode
if (fstream == NULL) {
perror("Couldn't open the file!\nError");
exit(EXIT_FAILURE);
}
fclose(*fstream); //Closing filestream
openFile(fstream, path, mode); //Recursive call of openFile() to re-open in read-mode
/* freopen(path,mode,fstream) */ //Doesn't work either
break;
default:
exit(EXIT_FAILURE);
break;
}
} else if (*fstream != NULL) {
printf("Successfully opened %s\n", path);
}
}
通话:
openFile(&fp, path,"r");
if (fputs("blabla\nblabla\n",fp) == EOF) {
perror("Unable to write file with fputs()");
}
我做错了什么?我认为这是在函数的递归调用时,但是我在这里要做的是什么?我不明白。
输出为:
> .\a
Content of path: test.txt
Error number 2 : Error opening file: : No such file or directory
Creating file test.txt now...
Successfully opened test.txt
Unable to write file with fputs(): Bad file descriptor
PS:我是C语言的初学者,我已经读过很多关于指针的YouTube,但我没有弄错。
提前谢谢
答案 0 :(得分:3)
您使用privkey.pem
打开了文件,但仍在尝试写入。您需要使用"r"
。