recover

问题 I am trying to make a photo extraction program stop when it detects it is at the end of the file to be extracted. I did this by placing an if condition: if (feof(file)) { return 2; } After a fread function: fread(array, 1, 512, file); So that if fread reads to the end of the file, then feof will trigger and thereby end the program. This is my code: #include <stdio.h> #include <stdlib.h> #include <stdbool.h> int main(int argc, char *argv[]) { if (argc != 2) { printf("Invalid entry.\n"); return

问题 So I'm trying CS50 Recover exercise (where you need to search for jpg files in a memory card and whenever you find one- you open a new file and write the jpg found to the new file). My code compiles but when I'm running the check50 command I'm receiving the following errors: :( recovers 000.jpg correctly recovered image does not match :( recovers middle images correctly recovered image does not match :( recovers 049.jpg correctly recovered image does not match Can somebody help me figure out

问题 So I'm trying CS50 Recover exercise (where you need to search for jpg files in a memory card and whenever you find one- you open a new file and write the jpg found to the new file). My code compiles but when I'm running the check50 command I'm receiving the following errors: :( recovers 000.jpg correctly recovered image does not match :( recovers middle images correctly recovered image does not match :( recovers 049.jpg correctly recovered image does not match Can somebody help me figure out

问题 I'm attempting the 'Recover' question on CS50's pset4. Though my code produced all 50 pictures, there is a bug as when I ran checkcs50, the first, middle, and 049 image doesn't match. To be clear, I was able to retrieve 000.jpg, followed immediately by files 002.jpg through 0050.jpg. Can anyone please tell me what I did wrong in my code? Thank you all very much in advance! Here's my code: #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <stdbool.h> bool magictag(int *); int

问题 I have written a dynamic programming algorithm that finds the total amount of subsets that sum up to a target value. However, I am having trouble developing a function to recover the solution (that is, print out the actual subsets). For example, let's take the set [1,3,5,7,9,10] with the target 13 . My algorithm calculates that there are 3 subsets. The output table is shown in the image below. Because this is a simple set, I can manually determine which three subsets make up the target. That

问题 gcc -L/root/Desktop - Wall -o prog3.c -pthread -lcopy /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.0: In function '_start': (.text+0x20): undefined reference to 'main' collect2: error: ld returned 1 exit status This is my error code. prog3.c is nowhere to be found, what on earth happened is there any way to get my file back?? The bold is the command I ran and the rest is the resultant console output 回答1: Your problem is here: -o prog3.c . gcc ’s -o option is used to tell

问题 gcc -L/root/Desktop - Wall -o prog3.c -pthread -lcopy /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.0: In function '_start': (.text+0x20): undefined reference to 'main' collect2: error: ld returned 1 exit status This is my error code. prog3.c is nowhere to be found, what on earth happened is there any way to get my file back?? The bold is the command I ran and the rest is the resultant console output 回答1: Your problem is here: -o prog3.c . gcc ’s -o option is used to tell

问题 I have .frm, ibdata and ib_logfile from my previous version of MySQl and now I have shifting to a newer version. Unfortunately, I donot have the previous version installed so I cannot take the dump and import into the new MySQl version. Please suggest some way to get these databases running in the newer MySQL version. I have all the required files from the previous MSQl. 回答1: It's really dangerous to do this, so just do it on a copy of the files (and try hard to use the exact same version of

问题 I have .frm, ibdata and ib_logfile from my previous version of MySQl and now I have shifting to a newer version. Unfortunately, I donot have the previous version installed so I cannot take the dump and import into the new MySQl version. Please suggest some way to get these databases running in the newer MySQL version. I have all the required files from the previous MSQl. 回答1: It's really dangerous to do this, so just do it on a copy of the files (and try hard to use the exact same version of

问题 So, I am (well... I was) running PostgreSQL within a container (Ubuntu 14.04LTS with all the recent updates, back-end storage is "dir" because of convince). To cut the long story short, the container folder got deleted. Following the use of extundelete and ext4magic, I have managed to extract some of the database physical files (it appears as if most of the files are there... but not 100% sure if and what is missing). I have two copies of the database files. One from 9.5.3 (which appears to