How to redirects to the sandbox use "printf" in iOS?

Question

In iOS development, I would like to test the output of the log to the local file. Use the redirection can be done to "NSLog" output to the file, but if I use the "printf" output when the use freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stdout); can not do. Is there any way to make "printf" output is also redirected to the log ?

Answer 1

i had fine the answer.

you can use dup2 instand of freopen,just do like this:

//将缓冲区禁止

setvbuf(stdout,NULL,_IONBF,0);

//用创建的文件描述符替换掉 标准输出和错误输出

//ignore logFilePath(just a file address).

int fd = open([logFilePath cStringUsingEncoding:NSASCIIStringEncoding],(O_RDWR | O_CREAT), 0644);

dup2(fd,STDOUT_FILENO);

dup2(fd, STDERR_FILENO)

then between NSLog and printf will redirected to your local.