仿照SDK编程写的窗口

Option Explicit

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 LoadIcon Lib "user32" Alias "LoadIconA" (ByVal hInstance As Long, ByVal lpIconName As String) As Long
Public Declare Function LoadCursor Lib "user32" Alias "LoadCursorA" (ByVal hInstance As Long, ByVal lpCursorName As String) As Long
Public Declare Function GetStockObject Lib "gdi32" (ByVal nIndex As Long) As Long
Public Declare Function RegisterClassEx Lib "user32" Alias "RegisterClassExA" (pcWndClassEx As WNDCLASSEX) As Integer
Public Declare Function ShowWindow Lib "user32" (ByVal handle_of_window As Long, ByVal nCmdShow As Long) As Long
Public Declare Function UpdateWindow Lib "user32" (ByVal handle_of_window As Long) As Long
Public Declare Function SetFocus Lib "user32" (ByVal handle_of_window As Long) As Long
Public Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal handle_of_window As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Declare Function DefWindowProc Lib "user32" Alias "DefWindowProcA" (ByVal handle_of_window 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 handle_of_window 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 Sub PostQuitMessage Lib "user32" (ByVal nExitCode As Long)
Public Declare Function BeginPaint Lib "user32" (ByVal handle_of_window As Long, lpPaint As PAINTSTRUCT) As Long
Public Declare Function EndPaint Lib "user32" (ByVal handle_of_window As Long, lpPaint As PAINTSTRUCT) As Long
Public Declare Function GetClientRect Lib "user32" (ByVal handle_of_window As Long, lpRect As RECT) As Long
Public Declare Function DrawText Lib "user32" Alias "DrawTextA" (ByVal hdc As Long, ByVal lpStr As String, ByVal nCount As Long, lpRect As RECT, ByVal wFormat As Long) As Long
                                                   
                                                   
Type WNDCLASSEX
    cbSize As Long
    style As Long
    lpfnWndProc As Long
    cbClsExtra As Long
    cbWndExtra As Long
    hInstance As Long
    hIcon As Long
    hCursor As Long
    hbrBackground As Long
    lpszMenuName As String
    lpszClassName As String
    hIconSm As Long
End Type

Type POINTAPI
        x As Long
        y As Long
End Type

Type MSG
    handle_of_window As Long
    message As Long
    wParam As Long
    lParam As Long
    time As Long
    pt As POINTAPI
End Type

Type RECT
        Left As Long
        Top As Long
        Right As Long
        Bottom As Long
End Type

Type PAINTSTRUCT
        hdc As Long
        fErase As Long
        rcPaint As RECT
        fRestore As Long
        fIncUpdate As Long
        rgbReserved(32) As Byte 'this was declared incorrectly in VB API viewer
End Type

Public Const WS_VISIBLE As Long = &H10000000
Public Const WS_VSCROLL As Long = &H200000
Public Const WS_TABSTOP As Long = &H10000
Public Const WS_THICKFRAME As Long = &H40000
Public Const WS_MAXIMIZE As Long = &H1000000
Public Const WS_MAXIMIZEBOX As Long = &H10000
Public Const WS_MINIMIZE As Long = &H20000000
Public Const WS_MINIMIZEBOX As Long = &H20000
Public Const WS_SYSMENU As Long = &H80000
Public Const WS_BORDER As Long = &H800000
Public Const WS_CAPTION As Long = &HC00000                  '  WS_BORDER Or WS_DLGFRAME
Public Const WS_CHILD As Long = &H40000000
Public Const WS_CHILDWINDOW As Long = (WS_CHILD)
Public Const WS_CLIPCHILDREN As Long = &H2000000
Public Const WS_CLIPSIBLINGS As Long = &H4000000
Public Const WS_DISABLED As Long = &H8000000
Public Const WS_DLGFRAME As Long = &H400000
Public Const WS_EX_ACCEPTFILES As Long = &H10&
Public Const WS_EX_DLGMODALFRAME As Long = &H1&
Public Const WS_EX_NOPARENTNOTIFY As Long = &H4&
Public Const WS_EX_TOPMOST As Long = &H8&
Public Const WS_EX_TRANSPARENT As Long = &H20&
Public Const WS_GROUP As Long = &H20000
Public Const WS_HSCROLL As Long = &H100000
Public Const WS_ICONIC As Long = WS_MINIMIZE
Public Const WS_OVERLAPPED As Long = &H0&
Public Const WS_OVERLAPPEDWINDOW As Long = (WS_OVERLAPPED Or WS_CAPTION Or WS_SYSMENU Or WS_THICKFRAME Or WS_MINIMIZEBOX Or WS_MAXIMIZEBOX)
Public Const WS_POPUP As Long = &H80000000
Public Const WS_POPUPWINDOW As Long = (WS_POPUP Or WS_BORDER Or WS_SYSMENU)
Public Const WS_SIZEBOX As Long = WS_THICKFRAME
Public Const WS_TILED As Long = WS_OVERLAPPED
Public Const WS_TILEDWINDOW As Long = WS_OVERLAPPEDWINDOW
Public Const CW_USEDEFAULT As Long = &H80000000
Public Const CS_HREDRAW As Long = &H2
Public Const CS_VREDRAW As Long = &H1
Public Const IDI_APPLICATION As Long = 32512&
Public Const IDC_ARROW As Long = 32512&
Public Const WHITE_BRUSH As Integer = 0
Public Const BLACK_BRUSH As Integer = 4
Public Const WM_KEYDOWN As Long = &H100
Public Const WM_CLOSE As Long = &H10
Public Const WM_DESTROY As Long = &H2
Public Const WM_PAINT As Long = &HF
Public Const SW_SHOWNORMAL As Long = 1
Public Const DT_CENTER As Long = &H1
Public Const DT_SINGLELINE As Long = &H20
Public Const DT_VCENTER As Long = &H4

Sub Main()

Call vbWinMain
 
End Sub
 
Public Function vbWinMain() As Long

    Const CLASSNAME = "hello_world_vb"
    Const TITLE = "hello, world!"
    Dim handle_of_window As Long
    Dim window_class As WNDCLASSEX
    Dim message As MSG
 
    window_class.cbSize = Len(window_class)
    window_class.style = CS_HREDRAW Or CS_VREDRAW
    window_class.lpfnWndProc = GetFuncPtr(AddressOf WindowProc)
    window_class.cbClsExtra = 0&
    window_class.cbWndExtra = 0&
    window_class.hInstance = App.hInstance
    window_class.hIcon = LoadIcon(App.hInstance, IDI_APPLICATION)
    window_class.hCursor = LoadCursor(App.hInstance, IDC_ARROW)
    window_class.hbrBackground = GetStockObject(WHITE_BRUSH)
    window_class.lpszMenuName = 0&
    window_class.lpszClassName = CLASSNAME
    window_class.hIconSm = LoadIcon(App.hInstance, IDI_APPLICATION)
   
    RegisterClassEx window_class
 
   
    handle_of_window = CreateWindowEx(0&, CLASSNAME, TITLE, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, 0&, 0&, App.hInstance, 0&)
   
    ShowWindow handle_of_window, SW_SHOWNORMAL
    UpdateWindow handle_of_window
    SetFocus handle_of_window
    Do While 0 <> GetMessage(message, 0&, 0&, 0&)
        TranslateMessage message
        DispatchMessage message
    Loop
   
    vbWinMain = message.wParam
End Function

Public Function WindowProc(ByVal handle_of_window As Long, ByVal message As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    Dim ps As PAINTSTRUCT
    Dim rc As RECT
    Dim hdc As Long
    Dim str As String
    Select Case message
        Case WM_PAINT
            hdc = BeginPaint(handle_of_window, ps)
            Call GetClientRect(handle_of_window, rc)
            str = "hello, world!"
            Call DrawText(hdc, str, Len(str), rc, DT_SINGLELINE Or DT_CENTER Or DT_VCENTER)
            Call EndPaint(handle_of_window, ps)
            Exit Function
   
        'Case WM_KEYDOWN
        '    Call PostMessage(handle_of_window, WM_CLOSE, 0, 0)
        '    Exit Function
           
        Case WM_DESTROY
            PostQuitMessage 0&
            Exit Function
           
        Case Else
            WindowProc = DefWindowProc(handle_of_window, message, wParam, lParam)
    End Select
End Function
 
Function GetFuncPtr(ByVal lngFnPtr As Long) As Long
    GetFuncPtr = lngFnPtr
End Function