C++同步调ArkTS里面的方法

napi_get_cb_info
napi_get_value_double
napi_create_double
napi_call_function
1.
2.
3.
4.

import hilog from '@ohos.hilog'; 
import testNapi from 'libentry.so'; 
 
@Entry 
@Component 
struct Index { 
  @State message: string = 'Hello World'; 
  //private resmgr = getContext().resourceManager;  // 获取js的资源对象 
 
  build() { 
    Row() { 
      Column() { 
        Text(this.message) 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold) 
          .onClick(() => { 
            hilog.info(0x0000, 'testTag', 'Test NAPI 2 + 3 = %{public}d', testNapi.add(2, 3)); 
            testNapi.addSync(3, 4, (result:number)=>{ 
              this.message = 'result is ' + result.toString(); 
            }); 
          }) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.

static napi_value AddSync(napi_env env, napi_callback_info info) { 
    size_t requireArgc = 3; 
    size_t argc = 3; 
    napi_value args[3] = {nullptr}; 
napi_value context = nullptr; 
 
napi_get_cb_info(env, info, &argc, args, &context, nullptr); 
 
napi_valuetype valuetype0; 
napi_typeof(env, args[0], &valuetype0); 
 
napi_valuetype valuetype1; 
napi_typeof(env, args[1], &valuetype1); 
 
double value0; 
napi_get_value_double(env, args[0], &value0); 
 
double value1; 
napi_get_value_double(env, args[1], &value1); 
 
napi_value callBackArg[1] = {nullptr}; 
napi_create_double(env, value0 + value1, &callBackArg[0]); 
 
napi_value sum; 
napi_call_function(env, context, args[2], 1, callBackArg, &sum); 
 
return sum; 
} 
EXTERN_C_START 
static napi_value Init(napi_env env, napi_value exports) 
{ 
    napi_property_descriptor desc[] = { 
        {"add", nullptr, Add, nullptr, nullptr, nullptr, napi_default, nullptr}, 
{"addSync", nullptr, AddSync, nullptr, nullptr, nullptr, napi_default, nullptr} 
}; 
napi_define_properties(env, exports, sizeof(desc) / sizeof(desc[0]), desc); 
return exports; 
} 
EXTERN_C_END
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.

export const addSync: (a: number, b: number, callback:(result:number)=>void) => number;
1.