用VB.NET寫的一個簡易的RSS閱讀器
2024-07-10 13:00:53
供稿：網友
源代碼如下:
imports system.xml
imports system.threading
public class form1
inherits system.windows.forms.form
#region " windows 窗體設計器生成的代碼 "
public sub new()
mybase.new()
'該調用是 windows 窗體設計器所必需的。
initializecomponent()
'在 initializecomponent() 調用之后添加任何初始化
end sub
'窗體重寫 dispose 以清理組件列表。
protected overloads overrides sub dispose(byval disposing as boolean)
if disposing then
if not (components is nothing) then
components.dispose()
end if
end if
mybase.dispose(disposing)
end sub
'windows 窗體設計器所必需的
private components as system.componentmodel.icontainer
'注意: 以下過程是 windows 窗體設計器所必需的
'可以使用 windows 窗體設計器修改此過程。
'不要使用代碼編輯器修改它。
friend withevents listbox1 as system.windows.forms.listbox
friend withevents button1 as system.windows.forms.button
friend withevents axwebbrowser1 as axshdocvw.axwebbrowser
friend withevents label1 as system.windows.forms.label
friend withevents label2 as system.windows.forms.label
friend withevents textbox1 as system.windows.forms.textbox
friend withevents statusbar1 as system.windows.forms.statusbar
friend withevents label4 as system.windows.forms.label
<system.diagnostics.debuggerstepthrough()> private sub initializecomponent()
dim resources as system.resources.resourcemanager = new system.resources.resourcemanager(gettype(form1))
me.listbox1 = new system.windows.forms.listbox
me.button1 = new system.windows.forms.button
me.axwebbrowser1 = new axshdocvw.axwebbrowser
me.label1 = new system.windows.forms.label
me.label2 = new system.windows.forms.label
me.textbox1 = new system.windows.forms.textbox
me.statusbar1 = new system.windows.forms.statusbar
me.label4 = new system.windows.forms.label
ctype(me.axwebbrowser1, system.componentmodel.isupportinitialize).begininit()
me.suspendlayout()
'
'listbox1
'
me.listbox1.location = new system.drawing.point(0, 67)
me.listbox1.name = "listbox1"
me.listbox1.size = new system.drawing.size(727, 108)
me.listbox1.tabindex = 0
'
'button1
'
me.button1.location = new system.drawing.point(633, 5)
me.button1.name = "button1"
me.button1.size = new system.drawing.size(94, 56)
me.button1.tabindex = 1
me.button1.text = "讀取"
'
'axwebbrowser1
'
me.axwebbrowser1.enabled = true
me.axwebbrowser1.location = new system.drawing.point(0, 193)
me.axwebbrowser1.ocxstate = ctype(resources.getobject("axwebbrowser1.ocxstate"), system.windows.forms.axhost.state)
me.axwebbrowser1.size = new system.drawing.size(727, 476)
me.axwebbrowser1.tabindex = 2
'
'label1
'
me.label1.location = new system.drawing.point(8, 26)
me.label1.name = "label1"
me.label1.size = new system.drawing.size(616, 15)
me.label1.tabindex = 3
me.label1.text = "網站地址："
'
'label2
'
me.label2.location = new system.drawing.point(8, 45)
me.label2.name = "label2"
me.label2.size = new system.drawing.size(616, 14)
me.label2.tabindex = 4
me.label2.text = "網站描述："
'
'textbox1
'
me.textbox1.location = new system.drawing.point(88, 0)
me.textbox1.name = "textbox1"
me.textbox1.size = new system.drawing.size(536, 20)
me.textbox1.tabindex = 6
me.textbox1.text = "http://blog.csdn.net/applebbs/rss.aspx"
'
'statusbar1
'
me.statusbar1.location = new system.drawing.point(0, 495)
me.statusbar1.name = "statusbar1"
me.statusbar1.size = new system.drawing.size(726, 22)
me.statusbar1.tabindex = 7
me.statusbar1.text = "statusbar1"
'
'label4
'
me.label4.location = new system.drawing.point(9, 6)
me.label4.name = "label4"
me.label4.size = new system.drawing.size(70, 12)
me.label4.tabindex = 8
me.label4.text = "rss地址："
me.label4.textalign = system.drawing.contentalignment.middleleft
'
'form1
'
me.autoscalebasesize = new system.drawing.size(5, 13)
me.clientsize = new system.drawing.size(726, 517)
me.controls.add(me.label4)
me.controls.add(me.statusbar1)
me.controls.add(me.textbox1)
me.controls.add(me.label2)
me.controls.add(me.label1)
me.controls.add(me.axwebbrowser1)
me.controls.add(me.button1)
me.controls.add(me.listbox1)
me.name = "form1"
me.startposition = system.windows.forms.formstartposition.centerscreen
me.text = "easy rss reader"
ctype(me.axwebbrowser1, system.componentmodel.isupportinitialize).endinit()
me.resumelayout(false)
end sub
#end region
private thread as thread '定義一個線程
private sub loadrss() '讀取rss文件并取出內容標題的過程
statusbar1.text = "正在讀取" & textbox1.text & "并效驗"
me.loadxmltocache(textbox1.text)
statusbar1.text = "正在讀取相關網站信息"
me.loadtitle()
statusbar1.text = "正在讀取相rss內容項"
me.loaditem()
statusbar1.text = "完成"
end sub
private sub button1_click(byval sender as system.object, byval e as system.eventargs) handles button1.click
try
thread = new thread(addressof loadrss)
thread.start()
catch ex as exception
msgbox(ex.tostring)
end try
end sub
private sub form1_load(byval sender as system.object, byval e as system.eventargs) handles mybase.load
axwebbrowser1.width = me.width
statusbar1.text = "就緒"
end sub
private sub loadxmltocache(byval url as string)
'讀取rss文件并存放在本地以供操作
dim xmldocument as new xmldocument
xmldocument.load(url)
xmldocument.save(application.startuppath & "~doc.xml")
end sub
private sub loadtitle()
'從本地文件中進行操作，讀取rss中有關網站的信息
dim xmldocument as new xmldocument
xmldocument.load(application.startuppath & "~doc.xml")
dim mynodelist as xmlnodelist
mynodelist = xmldocument.selectnodes("/rss/channel")
label1.text = "網站：" & trim(mynodelist(0).item("title").innertext())
label2.text = "描述：" & trim(mynodelist(0).item("description").innertext())
end sub
private sub loaditem()
'從本地文件中進行操作，讀取rss中內容的標題及作者
dim xmldocument as new xmldocument
xmldocument.load(application.startuppath & "~doc.xml")
dim mynodelist as xmlnodelist
mynodelist = xmldocument.selectnodes("/rss/channel/item")
listbox1.items.clear()
dim i as integer
for i = 0 to mynodelist.count - 1
listbox1.items.add("[" & trim(mynodelist(i).item("dc:creator").innertext()) & "]" & trim(mynodelist(i).item("title").innertext()))
next
end sub
private sub listbox1_selectedindexchanged(byval sender as system.object, byval e as system.eventargs) handles listbox1.selectedindexchanged
thread = new thread(addressof loadhtml)
thread.start()
end sub
private sub loadhtml()
'讀取rss中對應文件的內容并存到臨時文件后顯示
dim xmldocument as new xmldocument
xmldocument.load(application.startuppath & "~doc.xml")
dim mynodelist as xmlnodelist
mynodelist = xmldocument.selectnodes("/rss/channel/item")
dim i as integer
dim j as boolean
dim content as string
statusbar1.text = "正在讀取文章內容"
for i = 0 to mynodelist.count - 1
if listbox1.selecteditem = "[" & trim(mynodelist(i).item("dc:creator").innertext()) & "]" & trim(mynodelist(i).item("title").innertext()) then
content = content & "<html><head><meta http-equiv='content-type' content='text/html;charset=utf-8'></head><body>"
content = content & "<table width='100%' height='80' bgcolor='#eeeeee'><tr><td><b>標題：</b><a href='"
content = content & trim(mynodelist(i).item("link").innertext())
content = content & "' target='_blank'>"
content = content & trim(mynodelist(i).item("title").innertext())
content = content & "</a><br><b>作者：</b>"
content = content & trim(mynodelist(i).item("dc:creator").innertext())
content = content & "</tb></tr></table>"
content = content & formathtml(mynodelist(i).item("description").innertext())
content = content & "</body></html>"
j = savetextfile(application.startuppath & "~temp.html", content)
axwebbrowser1.navigate(application.startuppath & "~temp.html")
exit for
end if
next
statusbar1.text = "完成"
end sub
'寫文件的過程
function savetextfile(byval filepath as string, byval filecontent as string) as boolean
dim sw as system.io.streamwriter
try
sw = new system.io.streamwriter(filepath, false)
sw.write(filecontent)
return true
catch e as exception
return false
finally
if not sw is nothing then sw.close()
end try
end function
'從地址里取網址的函數
private function formaturl(byval str as string) as string
dim sstr as string
dim i as integer
dim j as integer
for i = 1 to len(str)
sstr = sstr & mid(str, i, 1)
if mid(str, i, 1) = "/" then
j += 1
end if
if j = 3 then exit for
next
return sstr
end function
'將內容里的相對圖片地址改成絕對地址的函數
private function formathtml(byval str as string) as string
return replace(str, "src=" & chr(34) & "/", "src =" & chr(34) & formaturl(textbox1.text))
end function
end class
