新增了 退还用户优惠卷、新增了处理用户处方图片

utils/compute.go

@@ -1,5 +1,13 @@
 package utils
 
+import (
+	"fmt"
+	"github.com/gen2brain/go-fitz"
+	"image/jpeg"
+	"os"
+	"path/filepath"
+)
+
 // 一些计算
 
 // ComputeIndividualIncomeTax 计算个人所得税
@@ -35,3 +43,43 @@ func ComputeIndividualIncomeTax(income float64) float64 {
 
 	return incomeTax
 }
+
+// ConvertPDFToImages converts a PDF file to images and saves them in the specified output directory.
+func ConvertPDFToImages(pdfPath string, outputDir string, filename string) error {
+	// Open the PDF file
+	doc, err := fitz.New(pdfPath)
+	if err != nil {
+		return fmt.Errorf("failed to open PDF file: %v", err)
+	}
+	defer doc.Close()
+
+	// Ensure the output directory exists
+	if err := os.MkdirAll(outputDir, os.ModePerm); err != nil {
+		return fmt.Errorf("failed to create output directory: %v", err)
+	}
+
+	// Iterate over each page in the PDF
+	for i := 0; i < doc.NumPage(); i++ {
+		// Render the page to an image
+		img, err := doc.Image(i)
+		if err != nil {
+			return fmt.Errorf("failed to render page %d: %v", i, err)
+		}
+
+		// Create the output file
+		outputFile := filepath.Join(outputDir, filename)
+		file, err := os.Create(outputFile)
+		if err != nil {
+			return fmt.Errorf("failed to create output file: %v", err)
+		}
+		defer file.Close()
+
+		// Encode the image as JPEG and save it to the file
+		opts := &jpeg.Options{Quality: 80}
+		if err := jpeg.Encode(file, img, opts); err != nil {
+			return fmt.Errorf("failed to encode image: %v", err)
+		}
+	}
+
+	return nil
+}