【4.1.1例子】[83页] iOSREHookTweak能够作用于短函数

我写了个更加简单的例子，发现现在的 MSHookFunction 确实能够 Hook 到短函数了。

// App
// YTRootViewController.mm

#import "YTRootViewController.h"

extern "C" void ShortCFunction(const char * arg0) {
	NSLog(@"==== CShortFunction: %s", arg0);
}

@implementation YTRootViewController
- (void)loadView {
	[super loadView];
	ShortCFunction("This is a short C function!");
}
@end

// Tweak
// Tweak.xm

#import <substrate.h>
void (*old_ShortCFunction)  (const char *);
void new_ShortCFunction(const char *arg0) {
	old_ShortCFunction("This is a hijacked short C function!");
}

%ctor
{
	@autoreleasepool {
		MSImageRef image = MSGetImageByName("/Application/shortFunction.app/shortFunction");
		void *_ShortCFunction = MSFindSymbol(image, "_ShortCFunction");
		if (_ShortCFunction) {
			NSLog(@"====== Find Short C Function!");
		}
		MSHookFunction((void*)_ShortCFunction, (void*)&new_ShortCFunction, (void **)&old_ShortCFunction);

	}
}

结果打印出来为：

Jul 1 15:26:22 ChenSH shortFunction[1373]: ====== Find Short C Function!

Jul 1 15:26:23 ChenSH shortFunction[1373]: ==== CShortFunction: This is a hijacked short C function!

我想这应该可以说明确实可以Hook到短函数了吧？