进门直接贴代码
- (void)log{
int fildes[2];
int fd = STDERR_FILENO;
pipe(fildes); // [0] is read end of pipe while [1] is write end
dup2(fildes[1], fd); // Duplicate write end of pipe "onto" fd (this closes fd)
close(fildes[1]); // Close original write end of pipe
fd = fildes[0]; // We can now monitor the read end of the pipe
char* buffer = malloc(1024);
NSMutableData* data = [[NSMutableData alloc] init];
fcntl(fd, F_SETFL, O_NONBLOCK);
self.source = dispatch_source_create(DISPATCH_SOURCE_TYPE_READ, fd, 0, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0));
dispatch_source_set_cancel_handler(self.source, ^{
free(buffer);
});
dispatch_source_set_event_handler(self.source, ^{
@autoreleasepool {
while (1) {
ssize_t size = read(fd, buffer, 1024);
if (size <= 0) {
break;
}
[data appendBytes:buffer length:size];
if (size < 1024) {
break;
}
}
NSString *aString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
// printf("aString = %s",[[aString substringFromIndex:30] UTF8String]);
// NSLog(@"aString = %@",aString);
//读到了日志,可以进行我们需要的各种操作了
}
});
dispatch_resume(self.source);
}
