背景: 测试人员没有Mac电脑, 需要看日志比较麻烦,所以好求歹求,就搞了这个。输出日志到沙盒文件,可以收集普通日志和崩溃日志
话不多说, 直接上代码!!!
+ (void)redirectNSlogToDocumentFolder {
NSString *documentDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSDateFormatter *dateformat = [[NSDateFormatter alloc]init];
[dateformat setDateFormat:@"yyyy-MM-dd-HH-mm-ss"];
NSString *fileName = [NSString stringWithFormat:@"LOG-%@.txt",[dateformat stringFromDate:[NSDate date]]];
NSString *logFilePath = [documentDirectory stringByAppendingPathComponent:@"LogFile"];
NSError *error;
NSFileManager *defaultManager = [NSFileManager defaultManager];
if (![defaultManager fileExistsAtPath:logFilePath]) {
[defaultManager createDirectoryAtPath:logFilePath withIntermediateDirectories:YES attributes:nil error:&error];
}
logFilePath = [logFilePath stringByAppendingPathComponent:fileName];
int dupValue = dup(STDERR_FILENO);
[[NSUserDefaults standardUserDefaults] setObject:[NSString stringWithFormat:@"%d", dupValue] forKey:@"dup"];
// 将log输入到文件
freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stdout);
freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stderr);
}
+ (void)stopLogCollection {
int dupValue = [[[NSUserDefaults standardUserDefaults] objectForKey:@"dup"] intValue];
dup2(dupValue, STDERR_FILENO);
dup2(dupValue, STDOUT_FILENO);
}
include <stdio.h>
include <unistd.h>
include <fcntl.h>
//STDIN_FILENO标准输入描述符(0)
//STDOUT_FILENO标准输出描述符(1)
//STDERR_FILENO标准错误描述符(2)
int main(void)
{
int n_fd;
int s_fd;
int fd = open("dup.txt", O_RDWR);
if(fd < 0) {
perror("open error");
exit(0);
}
s_fd = dup(STDOUT_FILENO);//文件描述符的赋值此时s_fd和STDOOUT_FILENO指向同一个内核文件表项
n_fd = dup2(fd, STDOUT_FILENO);//标准输出的重定向,此时进程文件表项中STDOUT_FILENO的文件指针发生变化,变为和fd的文件指针指向相同的一个内核文件表
//项,n_fd是新的文件描述符,STDOUT_FILENO(1)是对n_fd大小的设置
//注:n_fd和STDOUT_FIELNO是代表同一个进程文件表项
if(n_fd < 0) {
perror("dup2 error");
exit(0);
}
write(STDOUT_FILENO, "hello1", 6);//在dup.txt文件中写入六个字节
dup2(s_fd, STDOUT_FILENO);//对标准输出重定向,此时进程文件表项中STDOUT_FILENO的文件指针发生变化,和s_fd共享一个内核表项,即恢复为原来的标准输出
write(STDOUT_FILENO, "hello2", 6);//在终端输出6个字节
close(fd);
}
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