手电筒使用(C++)

开发步骤

详细的API说明请参考OH_Camera。

1. 导入NDK接口。选择系统提供的NDK接口能力，导入NDK接口的方法如下。

   // 导入NDK接口头文件。
   #include "hilog/log.h"
   #include "ohcamera/camera.h"
   #include "ohcamera/camera_input.h"
   #include "ohcamera/capture_session.h"
   #include "ohcamera/camera_manager.h"

2. 在CMake脚本中链接相关动态库。

   target_link_libraries(entry PUBLIC
       libace_napi.z.so
       libohcamera.so
       libhilog_ndk.z.so
   )

3. 通过OH_CameraManager_IsTorchSupported()方法，检测当前设备是否支持手电筒。

   bool IsTorchSupported(Camera_Manager* cameraManager)
   {
       // 判断设备是否支持手电筒模式。
       bool isTorchSupported = false;
       if (cameraManager == nullptr) {
           OH_LOG_ERROR(LOG_APP, "cameraManager is nullptr.");
           return isTorchSupported;
       }
       Camera_ErrorCode ret = OH_CameraManager_IsTorchSupported(cameraManager, &isTorchSupported);
       if (ret != CAMERA_OK) {
           OH_LOG_ERROR(LOG_APP, "OH_CameraManager_IsTorchSupported failed.");
       }
       if (isTorchSupported) {
           OH_LOG_INFO(LOG_APP, "isTorchSupported success.");
       } else {
           OH_LOG_ERROR(LOG_APP, "isTorchSupported failed.");
       }
       return isTorchSupported;
   }

4. 通过OH_CameraManager_IsTorchSupportedByTorchMode()方法，检测当前设备是否支持指定的手电筒模式。

   bool IsTorchSupportedByTorchMode(Camera_Manager* cameraManager, Camera_TorchMode torchMode)
   {
       bool torchModeSupported = false;
       Camera_ErrorCode ret = OH_CameraManager_IsTorchSupportedByTorchMode(cameraManager, torchMode, &torchModeSupported);
       if (ret != CAMERA_OK) {
            OH_LOG_ERROR(LOG_APP, "OH_CameraManager_IsTorchSupportedByTorchMode failed.");
       }
       if (torchModeSupported) {
            OH_LOG_INFO(LOG_APP, "IsTorchSupportedByTorchMode success.");
       } else {
            OH_LOG_ERROR(LOG_APP, "IsTorchSupportedByTorchMode failed. %{public}d ", ret);
       }
       return torchModeSupported;
   }

5. 通过OH_CameraManager_SetTorchMode()方法，设置当前设备的手电筒模式。

   Camera_ErrorCode SetTorchMode(Camera_Manager* cameraManager, Camera_TorchMode torchMode)
   {
       // 在torchMode支持的情况下进行设置手电筒模式。
       Camera_ErrorCode ret = OH_CameraManager_SetTorchMode(cameraManager, torchMode);
       if (ret != CAMERA_OK) {
           OH_LOG_ERROR(LOG_APP, "OH_CameraManager_SetTorchMode failed. %{public}d ", ret);
       } else {
           OH_LOG_INFO(LOG_APP, "OH_CameraManager_SetTorchMode success.");
       }
       return ret;
   }

状态监听

在相机应用开发过程中，可以随时监听手电筒状态，包括手电筒打开、手电筒关闭、手电筒不可用、手电筒恢复可用。手电筒状态发生变化，可通过回调函数获取状态的变化。

注册torchStatus事件，回调会返回监听结果，callback返回Camera_TorchStatusInfo参数，参数的具体内容可参考相机管理器回调接口实例Camera_TorchStatusInfo。

void TorchStatusCallback(Camera_Manager *cameraManager, Camera_TorchStatusInfo* torchStatus)
{
   OH_LOG_INFO(LOG_APP, "TorchStatusCallback is called.");
}
Camera_ErrorCode RegisterTorchStatusCallback(Camera_Manager *cameraManager)
{
    Camera_ErrorCode ret = OH_CameraManager_RegisterTorchStatusCallback(cameraManager, TorchStatusCallback);
    if (ret != CAMERA_OK) {
       OH_LOG_ERROR(LOG_APP, "OH_CameraManager_RegisterTorchStatusCallback failed.");
    }
    return ret;
}