(VB API)关于SendMessage中参数wMsg的常量如何取

Question

模块中代码:Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long,lParam As Any) As Long
Public Const EM_GETLINECOUNT=&HBA
Public Const EM_GETLINE=&HC4Form1的代码：Private Sub Command1_Click()
    Dim str(256) As Byte
    str(1)=1 '最大允许存放256个字符
    '获取总行数，结果显示在文本框txtLineCount中
    txtlineCount=SendMessage(Text1.hwnd,EM_GETLINECOUNT,0,0)
    '获取第3行的数据放在str中，转换为字符串后显示在文本框txtString中
    SendMessage Text1.hwnd,EM_GETLINE,2,str(0)
    txtString= StrConv(str,vbUnicode)
End Sub其中SendMessage向TextBox1.hWnd发送了消息EM_GETLINECOUNT和EM_GETLINE，其在常量的指定中分别定义为&HBA和&HC4，这些常量值代表着一定的控件内部的信息指令，我想知道这个两个常量的值是从获得？我又如何去知道这个常量值是做什么的呢？这些常量应该是对应每一个控件的，那么又怎么去查找这个常量值呢？

Answer 1

大哥啊!
    如果在msdn上面可以找得到的话我就不会发贴了，我是把MSDN从头翻到尾啊！
纵是没有找到。你说我郁闷不！
    而且这些常数量代表着一定的操作指令，只有用相应的常数量才能触发执行某个指令，虽然说是他定义的，但是我也要知道对应的常数量是进行什么样的操作，你说呢？

Answer 2

你在网上找找“windows消息大全”之类的东西来看看有个了解再到msdn去找。

Answer 3

Public Enum VBWin_Msg
    WM_NULL = &H0
    WM_CREATE = &H1
    WM_DESTROY = &H2
    WM_MOVE = &H3
    WM_SIZE = &H5
    WM_ACTIVATE = &H6
    WM_SETFOCUS = &H7
    WM_KILLFOCUS = &H8
    WM_ENABLE = &HA
    WM_SETREDRAW = &HB
    WM_SETTEXT = &HC
    WM_GETTEXT = &HD
    WM_GETTEXTLENGTH = &HE
    WM_PAINT = &HF
    WM_CLOSE = &H10
    WM_QUERYENDSESSION = &H11
    WM_QUIT = &H12
    WM_QUERYOPEN = &H13
    WM_ERASEBKGND = &H14
    WM_SYSCOLORCHANGE = &H15
    WM_ENDSESSION = &H16
    WM_SHOWWINDOW = &H18
    WM_WININICHANGE = &H1A
    WM_DEVMODECHANGE = &H1B
    WM_ACTIVATEAPP = &H1C
    WM_FONTCHANGE = &H1D
    WM_TIMECHANGE = &H1E
    WM_CANCELMODE = &H1F
    WM_SETCURSOR = &H20
    WM_MOUSEACTIVATE = &H21
    WM_CHILDACTIVATE = &H22
    WM_QUEUESYNC = &H23
    WM_GETMINMAXINFO = &H24
    'begin_r_winuser
    WM_PAINTICON = &H26
    WM_ICONERASEBKGND = &H27
    WM_NEXTDLGCTL = &H28
    WM_SPOOLERSTATUS = &H2A
    WM_DRAWITEM = &H2B
    WM_MEASUREITEM = &H2C
    WM_DELETEITEM = &H2D
    WM_VKEYTOITEM = &H2E
    WM_CHARTOITEM = &H2F
    WM_SETFONT = &H30
    WM_GETFONT = &H31
    WM_SETHOTKEY = &H32
    WM_GETHOTKEY = &H33
    WM_QUERYDRAGICON = &H37
    WM_COMPAREITEM = &H39
    WM_COMPACTING = &H41
    WM_COMMNOTIFY = &H44                     '/* no longer suported */
    WM_WINDOWPOSCHANGING = &H46
    WM_WINDOWPOSCHANGED = &H47
    WM_POWER = &H48
    WM_COPYDATA = &H4A
    WM_CANCELJOURNAL = &H4B
    'end_r_winuser
    'lParam of WM_COPYDATA message points to...
    'begin_r_winuser
''#if(WINVER >= 0x0400)
    WM_NOTIFY = &H4E
    WM_INPUTLANGCHANGEREQUEST = &H50
    WM_INPUTLANGCHANGE = &H51
    WM_TCARD = &H52
    WM_HELP = &H53
    WM_USERCHANGED = &H54
    WM_NOTIFYFORMAT = &H55        WM_CONTEXTMENU = &H7B
    WM_STYLECHANGING = &H7C
    WM_STYLECHANGED = &H7D
    WM_DISPLAYCHANGE = &H7E
    WM_GETICON = &H7F
    WM_SETICON = &H80
''#endif /* WINVER >= 0x0400 */
    WM_NCCREATE = &H81
    WM_NCDESTROY = &H82
    WM_NCCALCSIZE = &H83
    WM_NCHITTEST = &H84
    WM_NCPAINT = &H85
    WM_NCACTIVATE = &H86
    WM_GETDLGCODE = &H87
    WM_SYNCPAINT = &H88
    WM_NCMOUSEMOVE = &HA0
    WM_NCLBUTTONDOWN = &HA1
    WM_NCLBUTTONUP = &HA2
    WM_NCLBUTTONDBLCLK = &HA3
    WM_NCRBUTTONDOWN = &HA4
    WM_NCRBUTTONUP = &HA5
    WM_NCRBUTTONDBLCLK = &HA6
    WM_NCMBUTTONDOWN = &HA7
    WM_NCMBUTTONUP = &HA8
    WM_NCMBUTTONDBLCLK = &HA9    WM_KEYFIRST = &H100
    WM_KEYDOWN = &H100
    WM_KEYUP = &H101
    WM_CHAR = &H102
    WM_DEADCHAR = &H103
    WM_SYSKEYDOWN = &H104
    WM_SYSKEYUP = &H105
    WM_SYSCHAR = &H106
    WM_SYSDEADCHAR = &H107
    WM_KEYLAST = &H108''#if(WINVER >= 0x0400)
    WM_IME_STARTCOMPOSITION = &H10D
    WM_IME_ENDCOMPOSITION = &H10E
    WM_IME_COMPOSITION = &H10F
    WM_IME_KEYLAST = &H10F
''#endif /* WINVER >= 0x0400 */    WM_INITDIALOG = &H110
    WM_COMMAND = &H111
    WM_SYSCOMMAND = &H112
    WM_TIMER = &H113
    WM_HSCROLL = &H114
    WM_VSCROLL = &H115
    WM_INITMENU = &H116
    WM_INITMENUPOPUP = &H117
    WM_MENUSELECT = &H11F
    WM_MENUCHAR = &H120
    WM_ENTERIDLE = &H121
'#if(WINVER >= 0x0500)
    WM_MENURBUTTONUP = &H122
    WM_MENUDRAG = &H123
    WM_MENUGETOBJECT = &H124
    WM_UNINITMENUPOPUP = &H125
    WM_MENUCOMMAND = &H126
'#endif /* WINVER >= 0x0500 */
    WM_CTLCOLORMSGBOX = &H132
    WM_CTLCOLOREDIT = &H133
    WM_CTLCOLORLISTBOX = &H134
    WM_CTLCOLORBTN = &H135
    WM_CTLCOLORDLG = &H136
    WM_CTLCOLORSCROLLBAR = &H137
    WM_CTLCOLORSTATIC = &H138
    WM_MOUSEFIRST = &H200
    WM_MOUSEMOVE = &H200
    WM_LBUTTONDOWN = &H201
    WM_LBUTTONUP = &H202
    WM_LBUTTONDBLCLK = &H203
    WM_RBUTTONDOWN = &H204
    WM_RBUTTONUP = &H205
    WM_RBUTTONDBLCLK = &H206
    WM_MBUTTONDOWN = &H207
    WM_MBUTTONUP = &H208
    WM_MBUTTONDBLCLK = &H209'#if (_WIN32_WINNT >= 0x0400) || (_WIN32_WINDOWS > 0x0400)
    WM_MOUSEWHEEL = &H20A
    WM_MOUSELAST = &H20A
'#Else
'    WM_MOUSELAST = &H209
'#endif /* if (_WIN32_WINNT < 0x0400) */'#if(_WIN32_WINNT >= 0x0400)
'#define WHEEL_DELTA                     120     /* Value for rolling one detent */
'#endif /* _WIN32_WINNT >= 0x0400 */
'#if(_WIN32_WINNT >= 0x0400)
'#define WHEEL_PAGESCROLL                (UINT_MAX) /* Scroll one page */
'#endif /* _WIN32_WINNT >= 0x0400 */
    WM_PARENTNOTIFY = &H210
    WM_ENTERMENULOOP = &H211
    WM_EXITMENULOOP = &H212
'#if(WINVER >= 0x0400)
    WM_NEXTMENU = &H213
'// end_r_winuser
    WM_DEVICECHANGE = &H219
'#endif /* WINVER >= 0x0400 */
    WM_MDICREATE = &H220
    WM_MDIDESTROY = &H221
    WM_MDIACTIVATE = &H222
    WM_MDIRESTORE = &H223
    WM_MDINEXT = &H224
    WM_MDIMAXIMIZE = &H225
    WM_MDITILE = &H226
    WM_MDICASCADE = &H227
    WM_MDIICONARRANGE = &H228
    WM_MDIGETACTIVE = &H229    WM_MDISETMENU = &H230
    WM_ENTERSIZEMOVE = &H231
    WM_EXITSIZEMOVE = &H232
    WM_DROPFILES = &H233
    WM_MDIREFRESHMENU = &H234
'#if(WINVER >= 0x0400)
    WM_IME_SETCONTEXT = &H281
    WM_IME_NOTIFY = &H282
    WM_IME_CONTROL = &H283
    WM_IME_COMPOSITIONFULL = &H284
    WM_IME_SELECT = &H285
    WM_IME_CHAR = &H286
'#endif /* WINVER >= 0x0400 */
'#if(WINVER >= 0x0500)
    WM_IME_REQUEST = &H288
'#endif /* WINVER >= 0x0500 */
'#if(WINVER >= 0x0400)
    WM_IME_KEYDOWN = &H290
    WM_IME_KEYUP = &H291
'#endif /* WINVER >= 0x0400 */
'#if(_WIN32_WINNT >= 0x0400)
    WM_MOUSEHOVER = &H2A1
    WM_MOUSELEAVE = &H2A3
'#endif /* _WIN32_WINNT >= 0x0400 */    WM_CUT = &H300
    WM_COPY = &H301
    WM_PASTE = &H302
    WM_CLEAR = &H303
    WM_UNDO = &H304
    WM_RENDERFORMAT = &H305
    WM_RENDERALLFORMATS = &H306
    WM_DESTROYCLIPBOARD = &H307
    WM_DRAWCLIPBOARD = &H308
    WM_PAINTCLIPBOARD = &H309
    WM_VSCROLLCLIPBOARD = &H30A
    WM_SIZECLIPBOARD = &H30B
    WM_ASKCBFORMATNAME = &H30C
    WM_CHANGECBCHAIN = &H30D
    WM_HSCROLLCLIPBOARD = &H30E
    WM_QUERYNEWPALETTE = &H30F
    WM_PALETTEISCHANGING = &H310
    WM_PALETTECHANGED = &H311
    WM_HOTKEY = &H312
'#if(WINVER >= 0x0400)
    WM_PRINT = &H317
    WM_PRINTCLIENT = &H318
    WM_HANDHELDFIRST = &H358
    WM_HANDHELDLAST = &H35F    WM_AFXFIRST = &H360
    WM_AFXLAST = &H37F
'#endif /* WINVER >= 0x0400 */    WM_PENWINFIRST = &H380
    WM_PENWINLAST = &H38F
    WM_USER = &H400
Public Enum eWM_Msg
    WM_NULL = &H0
    WM_CREATE = &H1
    WM_DESTROY = &H2
    WM_MOVE = &H3
    WM_SIZE = &H5
    WM_ACTIVATE = &H6
    WM_SETFOCUS = &H7
    WM_KILLFOCUS = &H8
       WM_USER = &H400
End Enum

Answer 4

//如果在msdn上面可以找得到的话我就不会发贴了那是你还不会用msdn