如何在 Objective-C 中钩住 Apple 的"os_log_with_type"方法

Question

我想挂起"React Native"；RCTLog记录方法_RCTLogJavaScriptInternal，源代码为：

void _RCTLogJavaScriptInternal(RCTLogLevel level, NSString *message)
{
RCTLogFunction logFunction = RCTGetLocalLogFunction();
BOOL log = RCT_DEBUG || (logFunction != nil);
if (log && level >= RCTGetLogThreshold()) {
if (logFunction) {
logFunction(level, RCTLogSourceJavaScript, nil, nil, message);
}
}
}
RCTLogFunction RCTDefaultLogFunction =
^(RCTLogLevel level,
RCTLogSource source,
__unused NSString *fileName,
__unused NSNumber *lineNumber,
NSString *message) {
os_log_with_type(RCTLogForLogSource(source), RCTLogTypeForLogLevel(level), "%{public}s", message.UTF8String);
};

因此，如果我只是挂接苹果的os_log_with_type，我就会得到RCTLog日志。这是我的代码，但不起作用。请帮帮我。谢谢！！！！

#import <os/log.h>
#import "fishhook.h"
static void (*original_oslog)((os_log_t log, os_log_type_t type, const char *format, ...));
void hook_oslog(os_log_t log, os_log_type_t type, const char *format, ...) {
NSLog(@"hook success!");
}
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
struct rebinding oslog_rebinding = { "os_log_with_type", hook_oslog, (void *)&original_oslog };
rebind_symbols((struct rebinding[1]){oslog_rebinding}, 1);
});
}

Answer 1

最终，我找到了解决方案。不需要挂钩，React Native已经提供了相关的API。

RCTSetLogFunction(^(RCTLogLevel level, RCTLogSource source, NSString *fileName, NSNumber *lineNumber, NSString *message) {
NSLog(@"%@", message);
});