io_service_open_extended鏈接失敗

Question

我在使用xcode編譯代碼。由於IOKit已經被列入「鏈接二進制與圖書館」，但我仍然得到以下錯誤：

Undefined symbols for architecture x86_64:

"_io_connect_method_scalarI_scalarO"

"_io_service_open_extended"

_main in main.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)

雖然這兩個功能在程序中使用下面的代碼定義：

extern "C" kern_return_t io_service_open_extended 
(
    mach_port_t service, 
    task_t owningTask, 
    uint32_t connect_type, 
    NDR_record_t ndr, 
    io_buf_ptr_t properties, 
    mach_msg_type_number_t propertiesCnt, 
    kern_return_t *result, 
    mach_port_t *connection 
); 
extern "C" kern_return_t io_connect_method_scalarI_scalarO(
                  io_connect_t conn, uint32_t selector, 
                  io_scalar_inband64_t scalar_input, 
                  mach_msg_type_number_t scalar_inputCnt, 
                  io_struct_inband_t inband_output, 
                  mach_msg_type_number_t *inband_outputCnt 
                  ); 

但這些函數可以在Apple的API參考中找到，也可以用Google搜索。

Answer 1

試試這個：

將Build Active Architecture設置爲NO。