| 接口名 | 描述 |
|---|---|
| getPagePixelMap(): image.PixelMap | 获取当前页的图片。 |
| getCustomPagePixelMap(matrix: PdfMatrix, isGray: boolean, drawAnnotations: boolean): image.PixelMap | 获取指定PdfPage区域的图片内容。 |
| getAreaPixelMap(matrix: PdfMatrix, bitmapwidth: number, bitmapHeight: number, isGray: boolean, drawAnnotations: boolean): image.PixelMap | 获取指定PdfPage区域的图片内容，并指定图片的宽和高。 |
| getAreaPixelMapWithOptions(matrix: PdfMatrix, bitmapwidth: number, bitmapHeight: number, options?: PixelOptions): image.PixelMap | 获取指定PdfPage区域的图片内容，并指定图片的宽和高等参数。 |
| getPixelMapWithPages(pageIndices: number[], matrices: PdfMatrix[], bitmapWidth: number, bitmapHeight: number, pixelOptions?: PixelOptions): image.PixelMap | 获取多个页面合并后的pixelMap。 |
调用loadDocument方法加载PDF文档。
调用getPage方法获取某个页面。
调用getPagePixelMap、getAreaPixelMapWithOptions、getCustomPagePixelMap或getPixelMapWithPages方法获取当前页面、页面区域或指定多个页面，返回值均为image.PixelMap图像类型。
将image.PixelMap图像类型转化为二进制图片文件并保存，参考以下方法pixelMap2Buffer。
import { pdfService } from '@kit.PDFKit';
import { image } from '@kit.ImageKit';
import { fileIo } from '@kit.CoreFileKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
// ...
@Entry
@Component
struct PdfPage {
private pdfDocument: pdfService.PdfDocument = new pdfService.PdfDocument();
private context = this.getUIContext().getHostContext() as Context;
private loadResult: pdfService.ParseResult = pdfService.ParseResult.PARSE_ERROR_FORMAT;
aboutToAppear(): void {
// 确保在工程目录src/main/resources/resfile里有input.pdf文档
let filePath = this.context.resourceDir + '/input.pdf';
this.loadResult = this.pdfDocument.loadDocument(filePath);
}
// 将 pixelMap 转成图片格式
pixelMap2Buffer(pixelMap: image.PixelMap): Promise<ArrayBuffer> {
return new Promise((resolve, reject) => {
/**
设置打包参数
format：图片打包格式
quality：JPEG 编码输出图片质量
bufferSize：图片大小
*/
let packOpts: image.PackingOption = { format: 'image/jpeg', quality: 98 }
// 创建ImagePacker实例
const imagePackerApi = image.createImagePacker()
imagePackerApi.packToData(pixelMap, packOpts).then((buffer: ArrayBuffer) => {
resolve(buffer)
}).catch((err: BusinessError) => {
reject()
})
})
}
build() {
Column() {
// ...
// 获取为图片并保存到应用沙箱
Button('getPagePixelMap').onClick(async () => {
if (this.loadResult === pdfService.ParseResult.PARSE_SUCCESS) {
let page = this.pdfDocument.getPage(0)
let pixmap: image.PixelMap = page.getPagePixelMap();
if (!pixmap) {
return
}
const imgBuffer = await this.pixelMap2Buffer(pixmap)
try {
const file =
fileIo.openSync(this.context.filesDir + `/${Date.now()}.png`, fileIo.OpenMode.READ_WRITE | fileIo.OpenMode.CREATE);
await fileIo.write(file.fd, imgBuffer)
// 关闭文档
await fileIo.close(file.fd)
} catch (e) {
let error: BusinessError = e as BusinessError;
hilog.error(0x0000, 'PdfPage', `Code: ${error.code}, message: ${error.message} `);
}
}
})
// 获取指定PdfPage区域的图片内容
Button('getCustomPagePixelMap').onClick(async () => {
if (this.loadResult === pdfService.ParseResult.PARSE_SUCCESS) {
let page = this.pdfDocument.getPage(0);
let matrix = new pdfService.PdfMatrix();
matrix.x = 100;
matrix.y = 100;
matrix.width = 500;
matrix.height = 500;
matrix.rotate = 0;
let pixmap: image.PixelMap = page.getCustomPagePixelMap(matrix, false, false);
if (!pixmap) {
return;
}
const imgBuffer = await this.pixelMap2Buffer(pixmap);
try {
const file =
fileIo.openSync(this.context.filesDir + `/${Date.now()}.jpeg`, fileIo.OpenMode.READ_WRITE | fileIo.OpenMode.CREATE);
await fileIo.write(file.fd, imgBuffer);
await fileIo.close(file.fd);
} catch (e) {
let error: BusinessError = e as BusinessError;
hilog.error(0x0000, 'PdfPage', `Code: ${error.code}, message: ${error.message} `);
}
}
})
// 获取指定PdfPage区域的图片内容
Button('getAreaPixelMap').onClick(async () => {
if (this.loadResult === pdfService.ParseResult.PARSE_SUCCESS) {
// 获取对应的page
let page = this.pdfDocument.getPage(0);
let matrix = new pdfService.PdfMatrix();
// 设置matrix来控制需要获取的区域
matrix.x = 100;
matrix.y = 100;
matrix.width = 500;
matrix.height = 500;
matrix.rotate = 0;
let pixmap: image.PixelMap = page.getAreaPixelMap(matrix, 400, 400, true, false);
if (!pixmap) {
return
}
const imgBuffer = await this.pixelMap2Buffer(pixmap)
try {
const file =
fileIo.openSync(this.context.filesDir + `/${Date.now()}.bmp`, fileIo.OpenMode.READ_WRITE | fileIo.OpenMode.CREATE);
await fileIo.write(file.fd, imgBuffer)
await fileIo.close(file.fd);
} catch (e) {
let error: BusinessError = e as BusinessError;
hilog.error(0x0000, 'PdfPage', `Code: ${error.code}, message: ${error.message} `);
}
}
})
Button('getAreaPixelMapWithOptions').onClick(async () => {
if (this.loadResult === pdfService.ParseResult.PARSE_SUCCESS) {
let page = this.pdfDocument.getPage(0);
let matrix = new pdfService.PdfMatrix();
matrix.x = 100;
matrix.y = 100;
matrix.width = 500;
matrix.height = 500;
matrix.rotate = 0;
// 设置pixelmap是否黑白，背景是否透明等参数
let options = new pdfService.PixelOptions();
options.isGray = false;
options.drawAnnotations = true;
options.isTransparent = true;
let pixmap: image.PixelMap = page.getAreaPixelMapWithOptions(matrix, 400, 400, options);
if (!pixmap) {
return
}
const imgBuffer = await this.pixelMap2Buffer(pixmap)
try {
const file =
fileIo.openSync(this.context.filesDir + `/${Date.now()}.bmp`, fileIo.OpenMode.READ_WRITE | fileIo.OpenMode.CREATE);
await fileIo.write(file.fd, imgBuffer)
await fileIo.close(file.fd);
} catch (e) {
let error: BusinessError = e as BusinessError;
hilog.error(0x0000, 'PdfPage', `Code: ${error.code}, message: ${error.message} `);
}
}
})
// ...
}
}
}