harmony 鸿蒙Compiler and Runtime
Compiler and Runtime
What should I do if a crash occurs when I obtain a string in JSON format from rawfile, convert the string into an object, and call the instance method? (API version 9)
Symptom
“jscrash happened in xxxxxxxxx” is displayed, and the crash log contains “Error message: Unexpected Object in JSON”.
Solution
The prototype of the object obtained by parsing the string in JSON format is object. The prototype chain does not contain the instance method. Therefore, the object cannot be called.
To solve this problem, use either of the following methods:
Add the prototype to the parsed object.
Change the instance method to a static method and call it through the class name.
What should I do to prevent unexpected error behavior when napi_call_function is called again after a pending exception is captured in it? (API version 10)
Symptom
When napi_call_function is called to invoke an ArkTs function, a pending exception is captured. If security check is not performed upon a pending exception, an error will occur when napi_call_function is called next time and the error behavior is unpredictable.
Solution
If an error occurs when a native method using napi_call_function is called by ArkTS, throw jscrash. Then, try…catch on ArkTS will fail. If an exception occurs when napi_call_function is called, return a response in time.
Are there any other exception scenarios besides the pending exception in napi_call_function? (API version 10)
Solution
Theoretically, an exception may occur when a Node-API interface is called. For critical service processes, you need to add the processing logic to check the return value and determine whether an exception occurs. The following is an example:
napi_status status = napi_create_object(env, &object);
if (status != napi_ok) {
napi_throw_error(env, ...);
return;
}
What should I do if cppcrash is logged with error “resolveBufferCallback get buffer failed” when multiple HSPs are loaded?
Solution
This problem is caused by a failure in parsing the HSP. Generally, a loading failure is caused when the HSP fails to be installed, the file to load does not exist, the application does not have the required permission, or the secure memory verification fails. Locate and resolve the problem based on the error information. Generally, the fault can be rectified by reinstalling the application.
| Error Log | Fault Analysis | Handling Suggestion |
|---|---|---|
| realHapPath is empty | Failed to obtain information about the installation package. | Reinstall the application. |
| transform real path error: ERROR, pathName: PATH | Failed to parse the path using realpath() function.ERROR indicates the error information, and PATH indicates the path of the HSP. | Reinstall the application. |
| CreateFileMapper, mmap failed, errno ERROR. fileName: FILENAME | Failed to map the secure memory by using mmap() function. ERROR indicates the error information, and FILENAME indicates the file name. | The system memory is insufficient or the file is not signed. |
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