HarmonyOS鸿蒙Next中filePreview预览pdf,不显示pdf内容
HarmonyOS鸿蒙Next中filePreview预览pdf,不显示pdf内容
let uiContext = this.getHostContext() as Context
let pathDir = uiContext.filesDir + '/pdf123.pdf';
let uri = fileUri.getUriFromPath(pathDir);
let fileInfo: filePreview.PreviewInfo = {
// 该uri仅为参考,需要根据实际业务传入真实uri
uri: uri,
mimeType: 'application/pdf'
};
console.info("The uri " + uri);
//file://com.example.myapplication3/data/storage/el2/base/haps/entry/files/pdf123.pdf
filePreview.canPreview(uiContext, uri).then((result) => { // 文件存在且符合类型时,此处返回true
console.info(`Succeeded in obtaining the result of whether it can be previewed. result = ${result}`);
filePreview.openPreview(uiContext, fileInfo).then(() => {
console.info('Succeeded in opening preview');
}).catch((err: BusinessError) => {
console.error(`Failed to open preview, err.code = ${err.code}, err.message = ${err.message}`);
});
}).catch((err: BusinessError) => {
console.error(`Failed to obtain the result of whether it can be previewed, err.code = ${err.code}, err.message = ${err.message}`);
})
3 回复
在rawfile下预制文件,然后将rawfile文件导入沙箱中,确保需要预览的文件,沙箱中存在。
通过Preview Kit(文件预览服务)预览沙箱中的文件。 以下以预览pdf文件为例,示例代码:
import { BusinessError } from '@kit.BasicServicesKit';
import { fileUri, fileIo as fs } from '@kit.CoreFileKit';
import { filePreview } from '@kit.PreviewKit';
@Entry
@Component
struct Index {
private context = this;
private pdfPath = this.context.filesDir + "/123.pdf"
aboutToAppear(): void {
// 将rawfile目录下文件复制到沙箱目录
this.context.resourceManager.getRawFileContent('123.pdf', (_err, value) => {
let myBuffer: ArrayBufferLike = value.buffer
console.log("pdf path:" + this.pdfPath);
let file = fs.openSync(this.pdfPath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
fs.writeSync(file.fd, myBuffer);
console.info("write file success");
fs.closeSync(file);
})
}
build() {
Column() {
Button('预览pdf')
.id('stop')
.fontSize(20)
.fontWeight(FontWeight.Bold)
.onClick(() => {
let uri = fileUri.getUriFromPath(this.pdfPath);
let fileInfo: filePreview.PreviewInfo = {
uri: uri,
mimeType: 'application/pdf'
};
filePreview.canPreview(this.context, uri).then((result) => {
// 文件存在且符合类型时,此处返回true
console.info(`Succeeded in obtaining the result of whether it can be previewed. result = ${result}`);
if (result) {
// 预览文件
filePreview.openPreview(this.context, fileInfo).then(() => {
console.info('Succeeded in opening preview');
}).catch((err: BusinessError) => {
console.error(`Failed to open preview, err.code = ${err.code}, err.message = ${err.message}`);
});
}
}).catch((err: BusinessError) => {
console.error(`Failed to obtain the result of whether it can be previewed, err.code = ${err.code}, err.message = ${err.message}`);
})
})
}
.height('100%')
.width('100%')
.alignItems(HorizontalAlign.Center)
.justifyContent(FlexAlign.Center)
}
}
更多关于HarmonyOS鸿蒙Next中filePreview预览pdf,不显示pdf内容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中,filePreview
组件用于预览文件,包括PDF文件。如果PDF内容无法显示,可能的原因包括:
- 文件路径错误:确保提供的文件路径正确,文件存在于指定路径。
- 文件格式不支持:虽然
filePreview
支持PDF,但某些特殊格式或加密的PDF可能无法正常显示。 - 权限问题:检查应用是否具有读取文件的权限,确保在
config.json
中正确配置了权限。 - 组件配置错误:检查
filePreview
组件的配置,确保所有必要参数正确设置。 - 系统或API问题:可能是系统或API的bug,建议检查是否有相关更新或补丁。
示例代码:
import filePreview from '@ohos.file.preview';
let filePath = 'path/to/your/file.pdf';
filePreview.preview(filePath).then(() => {
console.log('PDF preview started');
}).catch((err) => {
console.error('Failed to preview PDF:', err);
});
如果问题仍然存在,建议检查日志以获取更多错误信息。