vb子窗体如何用代码切换

Static lDocumentCount As Long
Dim frmD As frmDocument
lDocumentCount = lDocumentCount + 1
Set frmD = New frmDocument
frmD.Caption = " & lDocumentCount
frmD，获取了子窗体列表后用这段代码添加了N个子窗体，如何点击列表就切换到相应的子窗体;Document "

用show和hide

不好意思，我也不知道。

你可以用一个数组对象来保存,,或是一个有规则的关键字,然后通过父窗口的Conotrols来访问

先将窗体名添加到列表框中 在列表框中的click()事件中通过判断，调用相应窗体的加载方法

思路： 程序运行时读取注册表，把读取到的内容对比，看看是否一样，一样则通过，显示主窗体，不一样则不通过。然后在用户单击注册按钮时判断，通过写入相关信息至注册表，并提示成功，否则不写入，并提示失败。 一般情况下软件信息写在注册表hkey_local_machine下的software里。 例子： private sub form_load() a = getstring(hkey_local_machine, "software\我的程序", "注册信息") if a = "" then setstring hkey_local_machine, "software\我的程序", "注册信息", "null" if a ……………………… then '省略号里面的内容看你怎么写了，就是通过验证的代码 unload me form2.show end if end sub private sub 注册按钮_click() if text1.text………………………………………… then '和上面的a一样 setstring hkey_local_machine, "software\我的程序", "注册信息", text1.text unload me form2.show msgbox "注册成功" else msgbox "注册失败" end if end sub 给你一个读写注册表的模块。不管在你这个程序中用了多少，以后也会有用的。 '================================ '注册表通用操作函数 '================================ '================================================== '注册表操作声明 public declare function regopenkey lib "advapi32.dll" alias "regopenkeya" (byval hkey as long, byval lpsubkey as string, phkresult as long) as long public declare function regenumvalue lib "advapi32.dll" alias "regenumvaluea" (byval hkey as long, byval dwindex as long, byval lpvaluename as string, lpcbvaluename as long, byval lpreserved as long, lptype as long, lpdata as byte, lpcbdata as long) as long public declare function regclosekey lib "advapi32.dll" (byval hkey as long) as long public declare function regcreatekey lib "advapi32.dll" alias "regcreatekeya" (byval hkey as long, byval lpsubkey as string, phkresult as long) as long public declare function regqueryvalueex lib "advapi32.dll" alias "regqueryvalueexa" (byval hkey as long, byval lpvaluename as string, byval lpreserved as long, lptype as long, lpdata as any, lpcbdata as long) as long public declare function regenumkeyex lib "advapi32.dll" alias "regenumkeyexa" (byval hkey as long, byval dwindex as long, byval lpname as string, lpcbname as long, byval lpreserved as long, byval lpclass as string, lpcbclass as long, lpftlastwritetime as any) as long public declare function regsetvalueex lib "advapi32.dll" alias "regsetvalueexa" (byval hkey as long, byval lpvaluename as string, byval reserved as long, byval dwtype as long, lpdata as any, byval cbdata as long) as long public declare function regdeletevalue lib "advapi32.dll" alias "regdeletevaluea" (byval hkey as long, byval lpvaluename as string) as long public declare function regdeletekey lib "advapi32.dll" alias "regdeletekeya" (byval hkey as long, byval lpsubkey as string) as long public const hkey_classes_root = &h80000000 public const hkey_current_user = &h80000001 public const hkey_local_machine = &h80000002 public const hkey_users = &h80000003 private const reg_sz = 1& private const reg_expand_sz = 2& private const reg_binary = 3& private const reg_dword = 4& private const error_success = 0& '================================================== '================================ '注册表操作函数 '================================ '读取注册表字符串键值 public function getstring(hkey as long, strpath as string, strvalue as string) dim keyhand as long dim lresult as long dim strbuf as string dim ldatabufsize as long dim intzeropos as integer dim lvaluetype as long 'new add regopenkey hkey, strpath, keyhand lresult = regqueryvalueex(keyhand, strvalue, 0&, lvaluetype, byval 0&, ldatabufsize) if lvaluetype = reg_sz or lvaluetype = reg_expand_sz then strbuf = string(ldatabufsize, " ") lresult = regqueryvalueex(keyhand, strvalue, 0&, lvaluetype, byval strbuf, ldatabufsize) if lresult = error_success then intzeropos = instr(strbuf, chr$(0)) if intzeropos > 0 then getstring = left$(strbuf, intzeropos - 1) else: getstring = strbuf end if end if end if end function '写入注册表字符串键值 public sub setstring(hkey as long, strpath as string, strvalue as string, strdata as string) dim keyhand as long regcreatekey hkey, strpath, keyhand regsetvalueex keyhand, strvalue, 0, reg_sz, byval strdata, len(strdata) regclosekey keyhand end sub '读取注册表 dword 键值 function getdword(byval hkey as long, byval strpath as string, byval strvaluename as string) as long dim lresult as long dim lvaluetype as long dim lbuf as long dim ldatabufsize as long dim r as long dim keyhand as long r = regopenkey(hkey, strpath, keyhand) ' get length/data type ldatabufsize = 4 lresult = regqueryvalueex(keyhand, strvaluename, 0&, lvaluetype, lbuf, ldatabufsize) if lresult = error_success then if lvaluetype = reg_dword then getdword = lbuf end if 'else ' call errlog("getdword-" & strpath, false) end if r = regclosekey(keyhand) end function '写入注册表 dword 键值 function setdword(byval hkey as long, byval strpath as string, byval strvaluename as string, byval ldata as long) dim keyhand as long regcreatekey hkey, strpath, keyhand regsetvalueex keyhand, strvaluename, 0&, reg_dword, ldata, 4 regclosekey keyhand end function '读取注册表二进制键值 function getbinary(byval hkey as long, byval strpath as string, byval strvaluename as string) as long dim lresult as long dim lvaluetype as long dim lbuf as long dim ldatabufsize as long dim r as long dim keyhand as long r = regopenkey(hkey, strpath, keyhand) ' get length/data type ldatabufsize = 4 lresult = regqueryvalueex(keyhand, strvaluename, 0&, lvaluetype, lbuf, ldatabufsize) if lresult = error_success then if lvaluetype = reg_binary then getbinary = lbuf end if end if r = regclosekey(keyhand) end function '写入注册表二进制键值 function setbinary(byval hkey as long, byval strpath as string, byval strvaluename as string, byval ldata as long, byval bitnumber as long) dim keyhand as long regcreatekey hkey, strpath, keyhand regsetvalueex keyhand, strvaluename, 0&, reg_binary, ldata, bitnumber regclosekey keyhand end function '删除一个注册表键值 public function deletevalue(byval hkey as long, byval strpath as string, byval strvalue as string) dim keyhand as long regopenkey hkey, strpath, keyhand regdeletevalue keyhand, strvalue regclosekey keyhand end function '创建一个主键 public function createkey(byval hkey as long, byval strkey as string) dim keyhand& regcreatekey hkey, strkey, keyhand regclosekey keyhand& end function