有人可以告诉我如何将 Stdout 重定向到 NSTextView 吗?
NSLog打印的信息是否属于std?
谢谢
最佳答案
下面的代码使用 dup2
将标准输出插入到 NSPipe
对象的写入端。使用 GCD 调度源观察读取端,它从管道读取数据并将其附加到 TextView 。
NSPipe* pipe = [NSPipe pipe];
NSFileHandle* pipeReadHandle = [pipe fileHandleForReading];
dup2([[pipe fileHandleForWriting] fileDescriptor], fileno(stdout));
dispatch_source_t source = dispatch_source_create(DISPATCH_SOURCE_TYPE_READ, [pipeReadHandle fileDescriptor], 0, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0));
dispatch_source_set_event_handler(source, ^{
void* data = malloc(4096);
ssize_t readResult = 0;
do
{
errno = 0;
readResult = read([pipeReadHandle fileDescriptor], data, 4096);
} while (readResult == -1 && errno == EINTR);
if (readResult > 0)
{
//AppKit UI should only be updated from the main thread
dispatch_async(dispatch_get_main_queue(),^{
NSString* stdOutString = [[NSString alloc] initWithBytesNoCopy:data length:readResult encoding:NSUTF8StringEncoding freeWhenDone:YES];
NSAttributedString* stdOutAttributedString = [[NSAttributedString alloc] initWithString:stdOutString];
[self.logView.textStorage appendAttributedString:stdOutAttributedString];
});
}
else{free(data);}
});
dispatch_resume(source);
NSLog(@"...")
虽然不会输出到 stdout
- 它会打印到 stderr
。如果您想将其重定向到您的 TextView ,请更改
dup2([[pipe fileHandleForWriting] fileDescriptor], fileno(stdout));
到
dup2([[pipe fileHandleForWriting] fileDescriptor], fileno(stderr));
关于objective-c - 如何将 STDOUT 重定向到 NSTextView?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16391279/