HarmonyOS 鸿蒙Next 控制台所有日志输出到文件如何实现
HarmonyOS 鸿蒙Next 控制台所有日志输出到文件如何实现
//demo
import picker from '@ohos.file.picker';
import { BusinessError } from '@kit.BasicServicesKit';
import fs from '@ohos.file.fs';
import { hilog } from '@kit.PerformanceAnalysisKit';
let uiContext = getContext(this);
//将文件从沙箱目录复制到文档
@Entry
@Component
struct Index {
@State message: string = ‘Hello World’;
build() {
Column() {
Button(‘保存’)
.onClick(async ()=>{
try {
try {
let documentSaveOptions = new picker.DocumentSaveOptions();
documentSaveOptions.newFileNames = [‘test.pdf’];
//文档目录
documentSaveOptions.defaultFilePathUri = ‘file://docs/storage/Users/currentUser/Documents’
let documentPicker = new picker.DocumentViewPicker(uiContext);
documentPicker.<span class="hljs-title function_">save</span>(documentSaveOptions).<span class="hljs-title function_">then</span>(<span class="hljs-function">(<span class="hljs-params">documentSaveResult: <span class="hljs-built_in">Array</span><string></span>) =></span> {
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">info</span>(<span class="hljs-string">'DocumentViewPicker.save successfully, documentSaveResult uri: '</span> + <span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">stringify</span>(documentSaveResult));
<span class="hljs-keyword">let</span> uri = documentSaveResult[<span class="hljs-number">0</span>];
<span class="hljs-keyword">let</span> file = fs.<span class="hljs-title function_">openSync</span>(uiContext.<span class="hljs-property">filesDir</span>+<span class="hljs-string">"/test.pdf"</span>)
<span class="hljs-keyword">let</span> file2 = fs.<span class="hljs-title function_">openSync</span>(uri,fs.<span class="hljs-property">OpenMode</span>.<span class="hljs-property">READ_WRITE</span>)
fs.<span class="hljs-title function_">copyFileSync</span>(file.<span class="hljs-property">fd</span>,file2.<span class="hljs-property">fd</span>)
fs.<span class="hljs-title function_">closeSync</span>(file)
fs.<span class="hljs-title function_">closeSync</span>(file2)
}).<span class="hljs-title function_">catch</span>(<span class="hljs-function">(<span class="hljs-params">err: BusinessError</span>) =></span> {
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">error</span>(<span class="hljs-string">'DocumentViewPicker.save failed with err: '</span> + <span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">stringify</span>(err));
});
} <span class="hljs-keyword">catch</span> (error) {
<span class="hljs-keyword">let</span> <span class="hljs-attr">err</span>: <span class="hljs-title class_">BusinessError</span> = error <span class="hljs-keyword">as</span> <span class="hljs-title class_">BusinessError</span>;
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">info</span>(<span class="hljs-string">"[picker] photoViewPickerSave error = "</span> + <span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">stringify</span>(err));
}
} <span class="hljs-keyword">catch</span> (error) {
<span class="hljs-keyword">let</span> <span class="hljs-attr">err</span>: <span class="hljs-title class_">BusinessError</span> = error <span class="hljs-keyword">as</span> <span class="hljs-title class_">BusinessError</span>;
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">error</span>(err.<span class="hljs-property">message</span>);
}
})
}.<span class="hljs-title function_">height</span>(<span class="hljs-string">'100%'</span>).<span class="hljs-title function_">width</span>(<span class="hljs-string">'100%'</span>)
}
}
更多关于HarmonyOS 鸿蒙Next 控制台所有日志输出到文件如何实现的实战系列教程也可以访问 https://www.itying.com/category-93-b0.html
在HarmonyOS鸿蒙Next系统中,将控制台的所有日志输出到文件,可以通过配置日志系统来实现。具体步骤如下:
-
配置日志级别和输出目标:
- 编辑项目中的日志配置文件(通常是
log_config.json
或类似文件)。 - 设置日志级别(如DEBUG、INFO、WARN、ERROR等)以确保所需级别的日志被捕获。
- 指定输出目标为文件,配置文件路径和文件名。
- 编辑项目中的日志配置文件(通常是
-
初始化日志系统:
- 在应用程序启动时,调用日志系统的初始化接口,传入配置文件路径。
- 确保日志系统正确加载配置并开始记录日志到指定文件。
-
日志记录:
- 在代码中通过日志接口记录日志,日志系统将根据配置自动将日志输出到文件。
-
验证日志输出:
- 运行应用程序并触发日志记录操作。
- 检查指定的日志文件,确认日志内容正确写入。
示例配置(假设配置文件为log_config.json
):
{
"level": "DEBUG",
"output": {
"type": "file",
"path": "/path/to/logfile.txt"
}
}
请确保路径有效且具有写权限。如果配置路径无效或权限不足,日志可能无法正确输出。
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