fix: 完善转换代理行为

backend/cmd/desktop/dialog_windows.go

@@ -3,31 +3,60 @@
 package main
 
 import (
+	"errors"
+	"fmt"
 	"syscall"
 	"unsafe"
+
+	"go.uber.org/zap"
 )
 
 const (
-	MB_ICONERROR       = 0x10
-	MB_ICONINFORMATION = 0x40
+	mbIconError       = 0x10
+	mbIconInformation = 0x40
 )
 
 var (
 	user32          = syscall.NewLazyDLL("user32.dll")
 	procMessageBoxW = user32.NewProc("MessageBoxW")
+	callMessageBoxW = func(hwnd, text, caption, flags uintptr) (uintptr, error) {
+		ret, _, err := procMessageBoxW.Call(hwnd, text, caption, flags)
+		return ret, err
+	}
 )
 
 func showError(title, message string) {
-	messageBox(title, message, MB_ICONERROR)
+	if err := messageBox(title, message, mbIconError); err != nil {
+		if zapLogger != nil {
+			zapLogger.Warn("显示错误对话框失败", zap.Error(err))
+		}
+	}
 }
 
-func messageBox(title, message string, flags uint) {
-	titlePtr, _ := syscall.UTF16PtrFromString(title)
-	messagePtr, _ := syscall.UTF16PtrFromString(message)
-	procMessageBoxW.Call(
+func messageBox(title, message string, flags uint) error {
+	titlePtr, err := syscall.UTF16PtrFromString(title)
+	if err != nil {
+		return err
+	}
+
+	messagePtr, err := syscall.UTF16PtrFromString(message)
+	if err != nil {
+		return err
+	}
+
+	ret, callErr := callMessageBoxW(
 		0,
 		uintptr(unsafe.Pointer(messagePtr)),
 		uintptr(unsafe.Pointer(titlePtr)),
 		uintptr(flags),
 	)
+	if ret != 0 {
+		return nil
+	}
+
+	if callErr != nil && !errors.Is(callErr, syscall.Errno(0)) {
+		return callErr
+	}
+
+	return fmt.Errorf("MessageBoxW 调用失败")
 }