Fyne错误：尝试在未启动应用程序时访问当前的Fyne应用程序。

huangapple
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英文:

Fyne error: Attempt to access current Fyne app when none is started

问题

我一直在努力找出导致这个错误的原因...可能只是我自己的问题，但也许你可以看出我看不到的地方。希望你能给我帮助。

每当我运行我的代码时，就会出现以下错误：

Fyne error: 尝试访问当前未启动的 Fyne 应用

go/pkg/mod/fyne.io/fyne/v2@v2.2.3/app.go:92

有什么想法吗？这是代码。而且它可以运行*。

  1. // GoMark 项目 main.go
  2. // 版本 1.3
  3. package main
  5. import (
  6. 	"fmt"
  7. 	"image/color"
  8. 	"log"
  9. 	"os"
  10. 	"runtime"
  12. 	"fyne.io/fyne/v2"
  13. 	"fyne.io/fyne/v2/app"
  14. 	"fyne.io/fyne/v2/canvas"
  15. 	"fyne.io/fyne/v2/container"
  16. 	"fyne.io/fyne/v2/dialog"
  17. 	"fyne.io/fyne/v2/theme"
  18. 	"fyne.io/fyne/v2/widget"
  19. )
  21. var text = widget.NewMultiLineEntry() // 文本输入框
  22. var textTitle = widget.NewLabel("")
  23. var preview = widget.NewRichTextFromMarkdown("") // 预览区域
  24. var myWindow fyne.Window
  25. var down_dir = ""
  26. var filePath = "" // 这部分不会编辑预设！请往下看...
  27. var savename = ""
  28. var savenametxt = ""
  29. var myApp = app.New()
  31. func main() {
  32. 	myWindow = myApp.NewWindow("GoMark 1.3")
  33. 	// - - - 文本编辑器 / 预览 - - -
  35. 	textTitle.SetText("未保存的文档")
  36. 	left := container.NewBorder(nil, nil, nil, nil, text)
  37. 	middle := container.NewHSplit(left, preview)
  38. 	text.OnChanged = func(string) { // 当文本输入框中有内容被写入或更改时，使用此函数更新预览区域
  39. 		preview.ParseMarkdown(text.Text)
  40. 	}
  41. 	// - - - 结束 - - -
  43. 	// - - - 顶部部分 - - -
  44. 	// 创建线条
  45. 	line := canvas.NewLine(color.Black)
  46. 	line.StrokeWidth = 4
  47. 	savename := widget.NewEntry()
  48. 	savename.SetPlaceHolder("ABC123")
  50. 	//- - - 设置工具栏 - - -
  51. 	settings := widget.NewToolbar(
  52. 		widget.NewToolbarAction(theme.ContentClearIcon(), func() {
  53. 			dialog.ShowConfirm("是否清空文档？", "", callback, myWindow)
  54. 		}),
  55. 		widget.NewToolbarSeparator(),
  56. 		widget.NewToolbarAction(theme.FolderNewIcon(), func() {
  57. 			log.Println("另存为文档")
  58. 			dialog.ShowFileSave(DownloadDirectory, myWindow)
  59. 		}),
  60. 		widget.NewToolbarAction(theme.DocumentSaveIcon(), func() {
  61. 			log.Println("保存文档")
  63. 			form_savename := widget.NewFormItem("", savename)
  64. 			form := dialog.NewForm("保存名称到 S:", "保存", "取消", []*widget.FormItem{form_savename}, func(b bool) {
  65. 				if b == true {
  66. 					fmt.Println("选择保存")
  67. 					savenametxt = savename.Text
  68. 					SaveToS(myWindow)
  69. 					savename.SetText(savenametxt)
  70. 				}
  71. 			}, myWindow)
  72. 			form.Resize(fyne.NewSize(400, 200))
  73. 			form.Show()
  74. 		}),
  75. 	)
  77. 	// 组合
  78. 	top := container.NewBorder(nil, line, nil, settings, textTitle)
  79. 	// - - - 结束 - - -
  81. 	// 运行主要的 fyne 窗口
  82. 	main := container.NewBorder(top, nil, nil, nil, middle)
  83. 	myWindow.Resize(fyne.NewSize(1200, 800))
  84. 	myWindow.SetContent(main)
  85. 	myWindow.ShowAndRun()
  86. }
  88. // 清空文本确认
  89. func callback(yes bool) {
  90. 	fmt.Println("运行回调函数")
  91. 	if yes == true {
  92. 		fmt.Println("清空文本")
  93. 		clean()
  94. 	} else {
  95. 		fmt.Println("文本保留")
  96. 	}
  97. }
  99. // 清空文本框和预览区域
  100. func clean() {
  101. 	text.Text = ""
  102. 	preview.ParseMarkdown(text.Text)
  103. 	text.Refresh()
  104. 	textTitle.Text = "未保存的文档"
  105. 	textTitle.Refresh()
  106. 	dialog.ShowInformation("文本已清空", "", myWindow)
  107. }
  109. // 选择下载文件夹
  110. func DownloadDirectory(savedir fyne.URIWriteCloser, err error) {
  111. 	fmt.Println("对话框")
  112. 	fmt.Println(savedir.URI())
  113. }
  115. //- - - 保存到 S: - - -
  116. func SaveToS(myWindow fyne.Window) {
  117. 	if runtime.GOOS == "Windows" {
  118. 		filePath = "S:\\TMP\\DocMove" // 编辑 Windows 的预设目录
  119. 		filePath = filePath + "\\"
  120. 	} else {
  121. 		filePath = "/mnt/s/TMP/DocMove" // 编辑 Linux 的预设目录
  122. 		filePath = filePath + "/"
  123. 	}
  124. 	fmt.Println(runtime.GOOS)
  125. 	file, errC := os.Create(filePath + savenametxt + ".md")
  126. 	if errC != nil {
  127. 		dialog.ShowError(errC, myWindow)
  128. 		fmt.Println(errC)
  129. 		return
  130. 	} else {
  131. 		_, errWriting := file.Write([]byte(text.Text))
  132. 		if errWriting != nil {
  133. 			dialog.ShowError(errWriting, myWindow)
  134. 			fmt.Println(errWriting)
  135. 			return
  136. 		} else {
  137. 			textTitle.SetText(savenametxt)
  138. 			dialog.ShowInformation("成功", savenametxt+" 已保存", myWindow)
  139. 			fmt.Println(filePath + savenametxt + ".md")
  140. 		}
  141. 	}
  142. }
英文:

I've been trying to figure out what is causing this error... Might just be me, but maybe you can see what i can't. Hopefully you can give me a helping hand.

Whenever I run my code it gives this error

> Fyne error: Attempt to access current Fyne app when none is started
>
> go/pkg/mod/fyne.io/fyne/v2@v2.2.3/app.go:92

Any idea? Here is the code. and It runs*

  1. // GoMark project main.go
  2. // Version 1.3
  3. package main
  5. import (
  6. 	"fmt"
  7. 	"image/color"
  8. 	"log"
  9. 	"os"
  10. 	"runtime"
  12. 	"fyne.io/fyne/v2"
  13. 	"fyne.io/fyne/v2/app"
  14. 	"fyne.io/fyne/v2/canvas"
  15. 	"fyne.io/fyne/v2/container"
  16. 	"fyne.io/fyne/v2/dialog"
  17. 	"fyne.io/fyne/v2/theme"
  18. 	"fyne.io/fyne/v2/widget"
  19. )
  21. var text = widget.NewMultiLineEntry() //Text entry
  22. var textTitle = widget.NewLabel("")
  23. var preview = widget.NewRichTextFromMarkdown("") //Preview side
  24. var myWindow fyne.Window
  25. var down_dir = ""
  26. var filePath = "" // THIS WILL NOT EDIT PRESET!!! Look further down...
  27. var savename = ""
  28. var savenametxt = ""
  29. var myApp = app.New()
  31. func main() {
  32. 	myWindow = myApp.NewWindow("GoMark 1.3")
  33. 	// - - - Text editor / Preview - - -
  35. 	textTitle.SetText("UNSAVED DOCUMENT")
  36. 	left := container.NewBorder(nil, nil, nil, nil, text)
  37. 	middle := container.NewHSplit(left, preview)
  38. 	text.OnChanged = func(string) { //When someting is written or canged in the text entry, update with this function
  39. 		preview.ParseMarkdown(text.Text)
  40. 	}
  41. 	// - - - END - - -
  43. 	// - - - TOP SECTION - - -
  44. 	//Line creation
  45. 	line := canvas.NewLine(color.Black)
  46. 	line.StrokeWidth = 4
  47. 	savename := widget.NewEntry()
  48. 	savename.SetPlaceHolder("ABC123")
  50. 	//- - - Settings toolbar - - -
  51. 	settings := widget.NewToolbar(
  52. 		widget.NewToolbarAction(theme.ContentClearIcon(), func() {
  53. 			dialog.ShowConfirm("Do you want to clear document?", "", callback, myWindow)
  54. 		}),
  55. 		widget.NewToolbarSeparator(),
  56. 		widget.NewToolbarAction(theme.FolderNewIcon(), func() {
  57. 			log.Println("Save as Doc")
  58. 			dialog.ShowFileSave(DownloadDirectory, myWindow)
  59. 		}),
  60. 		widget.NewToolbarAction(theme.DocumentSaveIcon(), func() {
  61. 			log.Println("Save Doc")
  63. 			form_savename := widget.NewFormItem("", savename)
  64. 			form := dialog.NewForm("Save Name to S:", "Save", "Cancel", []*widget.FormItem{form_savename}, func(b bool) {
  65. 				if b == true {
  66. 					fmt.Println("Save selected")
  67. 					savenametxt = savename.Text
  68. 					SaveToS(myWindow)
  69. 					savename.SetText(savenametxt)
  70. 				}
  71. 			}, myWindow)
  72. 			form.Resize(fyne.NewSize(400, 200))
  73. 			form.Show()
  74. 		}),
  75. 	)
  77. 	//Combiner
  78. 	top := container.NewBorder(nil, line, nil, settings, textTitle)
  79. 	// - - - END - - -
  81. 	//Run the main fyne window
  82. 	main := container.NewBorder(top, nil, nil, nil, middle)
  83. 	myWindow.Resize(fyne.NewSize(1200, 800))
  84. 	myWindow.SetContent(main)
  85. 	myWindow.ShowAndRun()
  86. }
  88. //Clear text confirmation
  89. func callback(yes bool) {
  90. 	fmt.Println("Running Callback")
  91. 	if yes == true {
  92. 		fmt.Println("Text CLEAR")
  93. 		clean()
  94. 	} else {
  95. 		fmt.Println("Text STAY")
  96. 	}
  97. }
  99. //Clear text box and preview
  100. func clean() {
  101. 	text.Text = ""
  102. 	preview.ParseMarkdown(text.Text)
  103. 	text.Refresh()
  104. 	textTitle.Text = "UNSAVED DOCUMENT"
  105. 	textTitle.Refresh()
  106. 	dialog.ShowInformation("Text has been cleared", "", myWindow)
  107. }
  109. //Choose a Download folder
  110. func DownloadDirectory(savedir fyne.URIWriteCloser, err error) {
  111. 	fmt.Println("Dialog")
  112. 	fmt.Println(savedir.URI())
  113. }
  115. //- - - Save to S: - - -
  116. func SaveToS(myWindow fyne.Window) {
  117. 	if runtime.GOOS == "Windows" {
  118. 		filePath = "S:\\TMP\\DocMove" //EDIT DIR PRESET FOR WINDOWS
  119. 		filePath = filePath + "\\"
  120. 	} else {
  121. 		filePath = "/mnt/s/TMP/DocMove" // EDIT DIR PRESET FOR LINUX
  122. 		filePath = filePath + "/"
  123. 	}
  124. 	fmt.Println(runtime.GOOS)
  125. 	file, errC := os.Create(filePath + savenametxt + ".md")
  126. 	if errC != nil {
  127. 		dialog.ShowError(errC, myWindow)
  128. 		fmt.Println(errC)
  129. 		return
  130. 	} else {
  131. 		_, errWriting := file.Write([]byte(text.Text))
  132. 		if errWriting != nil {
  133. 			dialog.ShowError(errWriting, myWindow)
  134. 			fmt.Println(errWriting)
  135. 			return
  136. 		} else {
  137. 			textTitle.SetText(savenametxt)
  138. 			dialog.ShowInformation("Sucess", savenametxt+" Has been saved", myWindow)
  139. 			fmt.Println(filePath + savenametxt + ".md")
  140. 		}
  141. 	}
  142. }

答案1

得分: 1

你正在尝试在初始化fyne应用程序之前创建小部件。

这个命令没有给我任何错误：

  1. var down_dir = ""
  2. var filePath = "" // 这不会编辑预设！请往下看...
  3. var savename = ""
  4. var savenametxt = ""
  5. var myApp = app.New()
  6. var text = widget.NewMultiLineEntry() // 文本输入
  7. var textTitle = widget.NewLabel("")
  8. var preview = widget.NewRichTextFromMarkdown("") // 预览侧边栏
  9. var myWindow fyne.Window
英文:

You are trying to create widgets before the fyne app is initiated.

This order gave me no errors:

  1. var down_dir = ""
  2. var filePath = "" // THIS WILL NOT EDIT PRESET!!! Look further down...
  3. var savename = ""
  4. var savenametxt = ""
  5. var myApp = app.New()
  6. var text = widget.NewMultiLineEntry() //Text entry
  7. var textTitle = widget.NewLabel("")
  8. var preview = widget.NewRichTextFromMarkdown("") //Preview side
  9. var myWindow fyne.Window

huangapple
  • 本文由 发表于 2022年9月5日 16:17:53
  • 转载请务必保留本文链接：https://go.coder-hub.com/73606435.html
  • fyne
  • go
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