关于调用私有库的c函数的问题

技能讨论
1

我想调用MobileKeyBag库的MKBUnlockDevice函数.

先贴代码

extern "C" int MKBUnlockDevice(NSData* passcode, int flags);
%ctor{
    NSString *passcode = [NSString stringWithFormat:@"%04d",1234];
    NSData *data = [passcode dataUsingEncoding:NSUTF8StringEncoding];
    int ret = MKBUnlockDevice(data,0);
    NSLog(@"ret:%d",ret);
}

Marakfile文件:smile:

DataProtection_PRIVATEFRAMEWORKS = MobileKeyBag

这样编译的话会报错

Making all for tweak DataProtection...
 Preprocessing Tweak.xm...
 Compiling Tweak.xm...
 Linking tweak DataProtection...
Undefined symbols for architecture armv7:
  "_MKBUnlockDevice", referenced from:
      _logosLocalCtor_e8d54f5f() in Tweak.xm.770c41e6.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [obj/DataProtection.dylib.ba964c90.unsigned] Error 1
make[1]: *** [internal-library-all_] Error 2
make: *** [DataProtection.all.tweak.variables] Error 2

我目前的解决办法是这样

int (*_MKBUnlockDevice)(NSData*,int) = (int(*)(NSData*,int))MSFindSymbol(NULL, "_MKBUnlockDevice");

问题:
私有库的C函数不能声明了之后直接调用吗,我使用公开库的C函数的话,是可以直接声明了直接调用的,不需要MSFindSymbol

2

改成

extern "C" int _MKBUnlockDevice(NSData* passcode, int flags);

试试

3

改了依然编译不通过…

4

这个问题我也是一直没解决，然后一直都是用dlsym的方法来做