VB6.0中如何动态创建窗体？
我想请教一下在VB6.0中如何动态创建窗体？
我用
Dim f as New Form1
f.show
发现Form1也会显示，有没有什么方法可以只显示动态创建的窗体f，而不显示设计时已有的Form1窗体呢？
谢谢！！！
[解决办法]
就不贴了，自己去看看吧。
http://www.fjvk.com/csdntopic/bbshtml/t/20020731/16/913913.html
[解决办法]
Public Declare Function RegisterClass Lib "user32 " Alias "RegisterClassA " (Class As WNDCLASS) As Long
Public Declare Function UnregisterClass Lib "user32 " Alias "UnregisterClassA " (ByVal lpClassName As String, ByVal hInstance As Long) As Long
Public Declare Function DefWindowProc Lib "user32 " Alias "DefWindowProcA " (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Declare Function GetMessage Lib "user32 " Alias "GetMessageA " (lpMsg As Msg, ByVal hwnd As Long, ByVal wMsgFilterMin As Long, ByVal wMsgFilterMax As Long) As Long
Public Declare Function TranslateMessage Lib "user32 " (lpMsg As Msg) As Long
Public Declare Function DispatchMessage Lib "user32 " Alias "DispatchMessageA " (lpMsg As Msg) As Long
Public Declare Function ShowWindow Lib "user32 " (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
Public Declare Function LoadCursor Lib "user32 " Alias "LoadCursorA " (ByVal hInstance As Long, ByVal lpCursorName As Any) As Long
Public Declare Function LoadIcon Lib "user32 " Alias "LoadIconA " (ByVal hInstance As Long, ByVal lpIconName As String) As Long
Public Declare Function CreateWindowEx Lib "user32 " Alias "CreateWindowExA " (ByVal dwExStyle As Long, ByVal lpClassName As String, ByVal lpWindowName As String, ByVal dwStyle As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hWndParent As Long, ByVal hMenu As Long, ByVal hInstance As Long, lpParam As Any) As Long
Public Declare Function CallWindowProc Lib "user32 " Alias "CallWindowProcA " (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Declare Function SetWindowLong Lib "user32 " Alias "SetWindowLongA " (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Public Declare Function GetWindowLong Lib "user32 " Alias "GetWindowLongA " (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Public Declare Function MessageBox Lib "user32 " Alias "MessageBoxA " (ByVal hwnd As Long, ByVal lpText As String, ByVal lpCaption As String, ByVal wType As Long) As Long
Public Declare Sub PostQuitMessage Lib "user32 " (ByVal nExitCode As Long)
Public Type WNDCLASS
style As Long
lpfnwndproc As Long
cbClsextra As Long
cbWndExtra2 As Long
hInstance As Long
hIcon As Long
hCursor As Long
hbrBackground As Long
lpszMenuName As String
lpszClassName As String
End Type
Public Type POINTAPI
x As Long
y As Long
End Type
Public Type Msg
hwnd As Long
message As Long
wParam As Long
lParam As Long
time As Long
pt As POINTAPI
End Type
Public Const CS_VREDRAW = &H1
Public Const CS_HREDRAW = &H2
Public Const CW_USEDEFAULT = &H80000000
Public Const ES_MULTILINE = &H4&
Public Const WS_BORDER = &H800000
Public Const WS_CHILD = &H40000000
Public Const WS_OVERLAPPED = &H0&
Public Const WS_CAPTION = &HC00000 ´ WS_BORDER Or WS_DLGFRAME
Public Const WS_SYSMENU = &H80000
Public Const WS_THICKFRAME = &H40000
Public Const WS_MINIMIZEBOX = &H20000
Public Const WS_MAXIMIZEBOX = &H10000
Public Const WS_OVERLAPPEDWINDOW = (WS_OVERLAPPED Or WS_CAPTION Or WS_SYSMENU Or WS_THICKFRAME Or WS_MINIMIZEBOX Or WS_MAXIMIZEBOX)
Public Const WS_EX_CLIENTEDGE = &H200&
Public Const COLOR_WINDOW = 5
Public Const WM_DESTROY = &H2
Public Const WM_LBUTTONDOWN = &H201
Public Const WM_LBUTTONUP = &H202
Public Const IDC_ARROW = 32512&
Public Const IDI_APPLICATION = 32512&
Public Const GWL_WNDPROC = (-4)
Public Const SW_SHOWNORMAL = 1
Public Const MB_OK = &H0&
Public Const MB_ICONEXCLAMATION = &H30&
声明几个我们需要的变量、常量：
Public Const gClassName = "MyClassName "
Public Const gAppName = "My Window Caption "
Public gButOldProc As Long
Public gHwnd As Long, gButtonHwnd As Long, gEditHwnd As Long
[解决办法]
入口函数：
Sub Main
代码如下：
Public Sub Main()
Dim wMsg As Msg
´´Call procedure to register window classname. If false, then exit.
If RegisterWindowClass = False Then Exit Sub
´´Create window
If CreateWindows Then
´´Loop will exit when WM_QUIT is sent to the window.
Do While GetMessage(wMsg, 0&, 0&, 0&)
´´TranslateMessage takes keyboard messages and converts
´´them to WM_CHAR for easier processing.
Call TranslateMessage(wMsg)
´´Dispatchmessage calls the default window procedure
´´to process the window message. (WndProc)
Call DispatchMessage(wMsg)
Loop
End If
Call UnregisterClass(gClassName$, App.hInstance)
End Sub
Public Function RegisterWindowClass() As Boolean
Dim wc As WNDCLASS
wc.style = CS_HREDRAW Or CS_VREDRAW
wc.lpfnwndproc = GetAddress(AddressOf WndProc) ´´Address in memory of default window procedure.
wc.hInstance = App.hInstance
wc.hIcon = LoadIcon(0&, IDI_APPLICATION) ´´Default application icon
wc.hCursor = LoadCursor(0&, IDC_ARROW) ´´Default arrow
wc.hbrBackground = COLOR_WINDOW ´´Default a color for window.
wc.lpszClassName = gClassName$
RegisterWindowClass = RegisterClass(wc) <> 0
End Function
Public Function CreateWindows() As Boolean
´´开始创建窗体
主窗体.
gHwnd& = CreateWindowEx(0&, gClassName$, gAppName$, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 208, 150, 0&, 0&, App.hInstance, ByVal 0&)
´´创建一个按钮
gButtonHwnd& = CreateWindowEx(0&, "Button ", "Click Here ", WS_CHILD, 58, 90, 85, 25, gHwnd&, 0&, App.hInstance, 0&)
´´创建一个(WS_EX_CLIENTEDGE、ES_MULTILINE风格的TextBox
gEditHwnd& = CreateWindowEx(WS_EX_CLIENTEDGE, "Edit ", "This is the edit control. " & vbCrLf & "As you can see, it´s multiline. ", WS_CHILD Or ES_MULTILINE, 0&, 0&, 200, 80, gHwnd&, 0&, App.hInstance, 0&)
"Button ", "Edit "系统中已经注册过了所以这里直接用
创建完别忘了显示出来否则是隐藏的
Call ShowWindow(gHwnd&, SW_SHOWNORMAL)
Call ShowWindow(gButtonHwnd&, SW_SHOWNORMAL)
Call ShowWindow(gEditHwnd&, SW_SHOWNORMAL)
记下按钮处理过错的当前所在地址
gButOldProc& = GetWindowLong(gButtonHwnd&, GWL_WNDPROC)
´´Set default window procedure of button to ButtonWndProc. Different
´´settings of windows is listed in the MSDN Library. We are using GWL_WNDPROC
´´to set the address of the window procedure.
指向新的处理过程地址
Call SetWindowLong(gButtonHwnd&, GWL_WNDPROC, GetAddress(AddressOf ButtonWndProc))
CreateWindows = (gHwnd& <> 0)
End Function
´窗体运行的主函数，在注册这个窗体时已经指定的
Public Function WndProc(ByVal hwnd As Long, ByVal uMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Dim strTemp As String
处理消息，这里指处理了WM_DESTROY消息
Select Case uMsg&
Case WM_DESTROY:
´´Since DefWindowProc doesn´t automatically call
´´PostQuitMessage (WM_QUIT). We need to do it ourselves.
´´You can use DestroyWindow to get rid of the window manually.
Call PostQuitMessage(0&)
End Select
´´Let windows call the default window procedure since we´re done.
WndProc = DefWindowProc(hwnd&, uMsg&, wParam&, lParam&)
End Function
又添加了一个Button的处理过程
Public Function ButtonWndProc(ByVal hwnd As Long, ByVal uMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Select Case uMsg&
Case WM_LBUTTONUP:
Call MessageBox(gHwnd&, "You clicked the button! ", App.Title, MB_OK Or MB_ICONEXCLAMATION)
End Select
ButtonWndProc = CallWindowProc(gButOldProc&, hwnd&, uMsg&, wParam&, lParam&)
End Function
Public Function GetAddress(ByVal lngAddr As Long) As Long
GetAddress = lngAddr&
End Function
[解决办法]
ref:
http://www.kpwang.com/vb/110664142224.htm
[解决办法]
lz的代码是创建Form1的实例化窗口，默认工程Form1会显示一次
经过
Dim f as Form1
set f = new Form1
f.show
又会显示一次，相当于动态创建的新的窗口
[解决办法]
dim frm as form
set frm = forms.add( "frmShow ")
frm.show
