CODEWITHSUNDEEP
cwindowsnetwork-programmingfopen
Galaxy
Galaxy

Reputation: 2481

fopen is unable to open windows hosts file

I am having a FILE* target here which should open the windows hosts file and write to it:

FILE* target;
target = fopen("C:\\windows\\sysnative\\drivers\\etc\\hosts", "r+");
if (target != NULL) {
    printf("true\n");
} else {
    printf("false\n");
}

However, upon opening the windows hosts file, it fails to open it. Specifically, fopen() returns NULL and false is printed to the screen. I checked the directory. It is good. Removing the extra \s, I was able to open it with Notepad. However fopen() cannot open that file. It is able to open any file in the current working directory, or in a nested directory inside it, but it can't open the hosts file. Perhaps I have an issue with my path? Am I missing something?

Upvotes: 0

Views: 142

Answers (2)

doron
doron

Reputation: 28902

Whenever a file operation fails on Windows, you can call GetLastError() (errno` on Posix systems) to find out why the operation fails. This will return an error code you can look up to find out why it failed

Upvotes: 0

user9234737
user9234737

Reputation:

you need admin priv to open hosts file on windows, try running your script as admin.

Upvotes: 1

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