fix html to png

printer.go

@@ -1,4 +1,4 @@
-package main
+package libgofunc
 
 import (
 	/*
@@ -17,12 +17,33 @@ import (
 
 	"github.com/kenshaw/escpos"
 )
+import (
+	"fmt"
+
+	"github.com/google/gousb"
+)
+
+type USBReadWriter struct {
+	out *gousb.OutEndpoint
+	in  *gousb.InEndpoint // Optional, can be nil if you only write
+}
+
+func (urw *USBReadWriter) Write(p []byte) (n int, err error) {
+	return urw.out.Write(p)
+}
+
+func (urw *USBReadWriter) Read(p []byte) (n int, err error) {
+	if urw.in == nil {
+		return 0, fmt.Errorf("read not supported")
+	}
+	return urw.in.Read(p)
+}
 
 //export PrintImg
 func PrintImg(printer *C.char, imagePath *C.char) *C.char {
 	goPrinter := C.GoString(printer)
 	goImagePath := C.GoString(imagePath)
-
+	var out *gousb.OutEndpoint
 	// printer := "tcp:192.168.100.151:9100"
 	// printer := "usb:/dev/usb/lp1"
 	var w *bufio.ReadWriter
@@ -44,6 +65,40 @@ func PrintImg(printer *C.char, imagePath *C.char) *C.char {
 		}
 		defer f.Close()
 		w = bufio.NewReadWriter(bufio.NewReader(f), bufio.NewWriter(f))
+	} else if strings.HasPrefix(goPrinter, "int:") {
+		ctx := gousb.NewContext()
+		// location := strings.TrimLeft(goPrinter, "int:")
+		targetBus := 1
+		targetAddr := 5
+		devs, err := ctx.OpenDevices(func(desc *gousb.DeviceDesc) bool {
+			return int(desc.Bus) == targetBus && int(desc.Address) == targetAddr
+		})
+		if err != nil || len(devs) == 0 {
+			log.Fatal("Could not find or open the device")
+		}
+		dev := devs[0]
+		defer dev.Close()
+		dev.SetAutoDetach(true)
+
+		// 2. Claim the default interface (usually 0 for printers)
+		// Note: This may require detaching the kernel driver on Linux
+		intf, done, err := dev.DefaultInterface()
+		if err != nil {
+			log.Fatalf("Failed to claim interface: %v", err)
+		}
+		defer done()
+
+		// 3. Open the Bulk Output Endpoint (usually endpoint #1 or #2)
+		// You may need to inspect desc.Endpoints to find the correct Bulk Out ID
+		out, err = intf.OutEndpoint(1)
+		if err != nil {
+			log.Fatalf("Failed to open OUT endpoint: %v", err)
+		}
+		// w = bufio.NewReadWriter(bufio.NewReader(outPort), bufio.NewWriter(f))
+		rw := &USBReadWriter{out: out}
+		reader := bufio.NewReader(rw)
+		writer := bufio.NewWriter(rw)
+		w = bufio.NewReadWriter(reader, writer)
 	}
 	prt := escpos.New(w)
 
@@ -59,3 +114,9 @@ func PrintImg(printer *C.char, imagePath *C.char) *C.char {
 	time.Sleep(100 * time.Millisecond)
 	return NewOk(nil)
 }
+
+func Print(printer, imagePath string) string {
+	result := PrintImg(C.CString(printer), C.CString(imagePath))
+	r := C.GoString(result)
+	return r
+}