harmony 鸿蒙Native API Usage

2022-10-28
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Native API Usage

Is there a native API that provides functions similar to Canvas?

Applicable to: OpenHarmony SDK 3.2.5.3, stage model of API version 9

Yes. The native API Drawing provides similar functions. It can be used for 2D drawing.

When a native HAP is running, the error message “Obj is not a valid object” is displayed for the imported namespace. What should I do?

Applicable to: OpenHarmony SDK 3.2.5.3, stage model of API version 9

Check the abiFilters parameter value in the build-profile.json5 file in the root directory of the module (not the root directory of the project). If the device is 32-bit, the value must be armeabi-v7a. If the device is 64-bit, the value must be arm64-v8a.

What should I do when the error message “install parse profile prop check error” is displayed during the running of a native HAP?

Applicable to: OpenHarmony SDK 3.2.6.3, stage model of API version 9

What should I do when the error message “undefined symbol: OH_LOG_Print” is displayed during log printing by OH_LOG_Print?

Applicable to: OpenHarmony SDK 3.2.6.3, stage model of API version 9

Modify the CMakeLists.txt file by adding libhilog_ndk.z.so to the end of target_link_libraries.

How do I obtain the value of version in the package.json file of a module?

Applicable to: OpenHarmony SDK 3.2.5.3, stage model of API version 9

In the script file hvigorfile.js of Hvigor, use subModule.getPackageJsonPath to obtain the location of the package.json file in the module.
Use Node.js to read the version field in the package.json file and write the value to the buildOption.cppFlags field in the build-profile.json5 file.

Example

// Module-level hvigorfile.js
const subModule = require('@ohos/hvigor')(__filename)

const fs = require("fs-extra")
const path = require("path")

const packageJsonPath = subModule.getPackageJsonPath()
const buildProfilePath = path.resolve(packageJsonPath, '../build-profile.json5')
const packageJsonData = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8'))
let buildProfileData = fs.readFileSync(buildProfilePath, 'utf8')
buildProfileData = buildProfileData.replace(/\"cppFlags\"\:(.*)\,/, `"cppFlags": "-D NWEBEX_VERSION=${packageJsonData.version}",`)
fs.writeFileSync(buildProfilePath, buildProfileData, 'utf8')

const ohosPlugin = require('@ohos/hvigor-ohos-plugin').hapTasks(subModule) // The plug-in executes the C++ build task and reads the build-profile.json5 file.

module.exports = {
  ohos: ohosPlugin
}

// Read the hello.cpp file.
#define _NWEBEX_VERSION(v) #v
#define _NWEBEX_VER2STR(v) _NWEBEX_VERSION(v)

static napi_value Add(napi_env env, napi_callback_info info)
{

    napi_value fixed_version_value = nullptr;
    napi_create_string_utf8(env, _NWEBEX_VER2STR(NWEBEX_VERSION), NAPI_AUTO_LENGTH, &fixed_version_value);

    return fixed_version_value;
}