把Message转换成String
注意，这里欠缺CM消息和CN消息，因为它们不是系统消息，不经过Dispatch API转发，但是可以把它们写在WndProc里，这样SendMessage送来的消息也可截获，或者Dispatch里，这样动态消息也可统统截获。另外就是要把VCL标准控件里，凡是改写了WndProc的子类也要截取，因为Windows会把消息发给它们，却不一定会调用TWinControl.WndProc函数（但大多数还是调用了，没准是全部）。唯一不能截获的是子类出现了新消息，并且改写了WndProc函数，不过这种情况不一定存在。还有自定义消息，还有第三方控件。
function WM_To_String(WM_Message: Integer): string;
begin
case WM_Message of
$0000: Result := 'WM_NULL';
$0001: Result := 'WM_CREATE';
$0002: Result := 'WM_DESTROY';
$0003: Result := 'WM_MOVE';
$0005: Result := 'WM_SIZE';
$0006: Result := 'WM_ACTIVATE';
$0007: Result := 'WM_SETFOCUS';
$0008: Result := 'WM_KILLFOCUS';
$000A: Result := 'WM_ENABLE';
$000B: Result := 'WM_SETREDRAW';
$000C: Result := 'WM_SETTEXT';
$000D: Result := 'WM_GETTEXT';
$000E: Result := 'WM_GETTEXTLENGTH';
$000F: Result := 'WM_PAINT';
$0010: Result := 'WM_CLOSE';
$0011: Result := 'WM_QUERYENDSESSION';
$0012: Result := 'WM_QUIT';
$0013: Result := 'WM_QUERYOPEN';
$0014: Result := 'WM_ERASEBKGND';
$0015: Result := 'WM_SYSCOLORCHANGE';
$0016: Result := 'WM_EndSESSION';
$0017: Result := 'WM_SYSTEMERROR';
$0018: Result := 'WM_SHOWWINDOW';
$0019: Result := 'WM_CTLCOLOR';
$001A: Result := 'WM_WININICHANGE or WM_SETTINGCHANGE';
$001B: Result := 'WM_DEVMODECHANGE';
$001C: Result := 'WM_ACTIVATEAPP';
$001D: Result := 'WM_FONTCHANGE';
$001E: Result := 'WM_TIMECHANGE';
$001F: Result := 'WM_CANCELMODE';
$0020: Result := 'WM_SETCURSOR';
$0021: Result := 'WM_MOUSEACTIVATE';
$0022: Result := 'WM_CHILDACTIVATE';
$0023: Result := 'WM_QUEUESYNC';
$0024: Result := 'WM_GETMINMAXINFO';
$0026: Result := 'WM_PAINTICON';
$0027: Result := 'WM_ICONERASEBKGND';
$0028: Result := 'WM_NEXTDLGCTL';
$002A: Result := 'WM_SPOOLERSTATUS';
$002B: Result := 'WM_DRAWITEM';
$002C: Result := 'WM_MEASUREITEM';
$002D: Result := 'WM_DELETEITEM';
$002E: Result := 'WM_VKEYTOITEM';
$002F: Result := 'WM_CHARTOITEM';
$0030: Result := 'WM_SETFONT';
$0031: Result := 'WM_GETFONT';
$0032: Result := 'WM_SETHOTKEY';
$0033: Result := 'WM_GETHOTKEY';
$0037: Result := 'WM_QUERYDRAGICON';
$0039: Result := 'WM_COMPAREITEM';
$003D: Result := 'WM_GETOBJECT';
$0041: Result := 'WM_COMPACTING';
$0044: Result := 'WM_COMMNOTIFY { obsolete in Win32}';
$0046: Result := 'WM_WINDOWPOSCHANGING';
$0047: Result := 'WM_WINDOWPOSCHANGED';
$0048: Result := 'WM_POWER';
$004A: Result := 'WM_COPYDATA';
$004B: Result := 'WM_CANCELJOURNAL';
$004E: Result := 'WM_NOTIFY';
$0050: Result := 'WM_INPUTLANGCHANGEREQUEST';
$0051: Result := 'WM_INPUTLANGCHANGE';
$0052: Result := 'WM_TCARD';
$0053: Result := 'WM_HELP';
$0054: Result := 'WM_USERCHANGED';
$0055: Result := 'WM_NOTIFYFORMAT';
$007B: Result := 'WM_CONTEXTMENU';
$007C: Result := 'WM_STYLECHANGING';
$007D: Result := 'WM_STYLECHANGED';
$007E: Result := 'WM_DISPLAYCHANGE';
$007F: Result := 'WM_GETICON';
$0080: Result := 'WM_SETICON';
$0081: Result := 'WM_NCCREATE';
$0082: Result := 'WM_NCDESTROY';
$0083: Result := 'WM_NCCALCSIZE';
$0084: Result := 'WM_NCHITTEST';
$0085: Result := 'WM_NCPAINT';
$0086: Result := 'WM_NCACTIVATE';
$0087: Result := 'WM_GETDLGCODE';
$0088: Result := 'WM_SYNCPAINT';
$00A0: Result := 'WM_NCMOUSEMOVE';
$00A1: Result := 'WM_NCLBUTTONDOWN';
$00A2: Result := 'WM_NCLBUTTONUP';
$00A3: Result := 'WM_NCLBUTTONDBLCLK';
$00A4: Result := 'WM_NCRBUTTONDOWN';
$00A5: Result := 'WM_NCRBUTTONUP';
$00A6: Result := 'WM_NCRBUTTONDBLCLK';
$00A7: Result := 'WM_NCMBUTTONDOWN';
$00A8: Result := 'WM_NCMBUTTONUP';
$00A9: Result := 'WM_NCMBUTTONDBLCLK';
// edit control messages start (todo: add more if needed)
$00B0: Result := 'EM_GETSEL';
$00B1: Result := 'EM_SETSEL';
$00B2: Result := 'EM_GETRECT';
$00B3: Result := 'EM_SETRECT';
$00B4: Result := 'EM_SETRECTNP';
$00B5: Result := 'EM_SCROLL';
$00B6: Result := 'EM_LINESCROLL';
$00B7: Result := 'EM_SCROLLCARET';
$00B8: Result := 'EM_GETMODIFY';
$00B9: Result := 'EM_SETMODIFY';
$00BA: Result := 'EM_GETLINECOUNT';
$00BB: Result := 'EM_LINEINDEX';
$00BC: Result := 'EM_SETHANDLE';
$00BD: Result := 'EM_GETHANDLE';
$00BE: Result := 'EM_GETTHUMB';
$00C1: Result := 'EM_LINELENGTH';
$00C2: Result := 'EM_REPLACESEL';
$00C4: Result := 'EM_GETLINE';
$00C5: Result := 'EM_LIMITTEXT';
$00C6: Result := 'EM_CANUNDO';
$00C7: Result := 'EM_UNDO';
$00C8: Result := 'EM_FMTLINES';
$00C9: Result := 'EM_LINEFROMCHAR';
$00CB: Result := 'EM_SETTABSTOPS';
$00CC: Result := 'EM_SETPASSWORDCHAR';
$00CD: Result := 'EM_EMPTYUNDOBUFFER';
$00CE: Result := 'EM_GETFIRSTVISIBLELINE';
$00CF: Result := 'EM_SETREADONLY';
$00D0: Result := 'EM_SETWORDBREAKPROC';
$00D1: Result := 'EM_GETWORDBREAKPROC';
$00D2: Result := 'EM_GETPASSWORDCHAR';
$00D3: Result := 'EM_SETMARGINS';
$00D4: Result := 'EM_GETMARGINS';
$00D5: Result := 'EM_GETLIMITTEXT';
$00D6: Result := 'EM_POSFROMCHAR';
$00D7: Result := 'EM_CHARFROMPOS';
// edit control messages end
// scrollbar control messages start
$00E0: Result := 'SBM_SETPOS';
$00E1: Result := 'SBM_GETPOS';
$00E2: Result := 'SBM_SETRANGE';
$00E3: Result := 'SBM_GETRANGE';
$00E4: Result := 'SBM_ENABLE_ARROWS';
$00E6: Result := 'SBM_SETRANGEREDRAW';
$00E9: Result := 'SBM_SETSCROLLINFO';
$00EA: Result := 'SBM_GETSCROLLINFO';
$00EB: Result := 'SBM_GETSCROLLBARINFO';
// scrollbar control messages end
// button control messages start
$00F0: Result := 'BM_GETCHECK';
$00F1: Result := 'BM_SETCHECK';
$00F2: Result := 'BM_GETSTATE';
$00F3: Result := 'BM_SETSTATE';
$00F4: Result := 'BM_SETSTYLE';
$00F5: Result := 'BM_CLICK';
$00F6: Result := 'BM_GETIMAGE';
$00F7: Result := 'BM_SETIMAGE';
$00F8: Result := 'BM_SETDONTCLICK';
// button control messages end
$0100: Result := 'WM_KEYFIRST or WM_KEYDOWN';
$0101: Result := 'WM_KEYUP';
$0102: Result := 'WM_CHAR';
$0103: Result := 'WM_DEADCHAR';
$0104: Result := 'WM_SYSKEYDOWN';
$0105: Result := 'WM_SYSKEYUP';
$0106: Result := 'WM_SYSCHAR';
$0107: Result := 'WM_SYSDEADCHAR';
$0108: Result := 'WM_KEYLAST';
$010D: Result := 'WM_IME_STARTCOMPOSITION';
$010E: Result := 'WM_IME_ENDCOMPOSITION';
$010F: Result := 'WM_IME_COMPOSITION or WM_IME_KEYLAST';
$0110: Result := 'WM_INITDIALOG';
$0111: Result := 'WM_COMMAND';
$0112: Result := 'WM_SYSCOMMAND';
$0113: Result := 'WM_TIMER';
$0114: Result := 'WM_HSCROLL';
$0115: Result := 'WM_VSCROLL';
$0116: Result := 'WM_INITMENU';
$0117: Result := 'WM_INITMENUPOPUP';
$011F: Result := 'WM_MENUSELECT';
$0120: Result := 'WM_MENUCHAR';
$0121: Result := 'WM_ENTERIDLE';
$0122: Result := 'WM_MENURBUTTONUP';
$0123: Result := 'WM_MENUDRAG';
$0124: Result := 'WM_MENUGETOBJECT';
$0125: Result := 'WM_UNINITMENUPOPUP';
$0126: Result := 'WM_MENUCOMMAND';
$0127: Result := 'WM_CHANGEUISTATE';
$0128: Result := 'WM_UPDATEUISTATE';
$0129: Result := 'WM_QUERYUISTATE';
$0132: Result := 'WM_CTLCOLORMSGBOX';
$0133: Result := 'WM_CTLCOLOREDIT';
$0134: Result := 'WM_CTLCOLORLISTBOX';
$0135: Result := 'WM_CTLCOLORBTN';
$0136: Result := 'WM_CTLCOLORDLG';
$0137: Result := 'WM_CTLCOLORSCROLLBAR';
$0138: Result := 'WM_CTLCOLORSTATIC';
$0140: Result := 'CB_GETEDITSEL';
$0141: Result := 'CB_LIMITTEXT';
$0142: Result := 'CB_SETEDITSEL';
$0143: Result := 'CB_ADDSTRING';
$0144: Result := 'CB_DELETESTRING';
$0145: Result := 'CB_DIR';
$0146: Result := 'CB_GETCOUNT';
$0147: Result := 'CB_GETCURSEL';
$0148: Result := 'CB_GETLBTEXT';
$0149: Result := 'CB_GETLBTEXTLEN';
$014A: Result := 'CB_INSERTSTRING';
$014B: Result := 'CB_RESETCONTENT';
$014C: Result := 'CB_FINDSTRING';
$014D: Result := 'CB_SELECTSTRING';
$014E: Result := 'CB_SETCURSEL';
$014F: Result := 'CB_SHOWDROPDOWN';
$0150: Result := 'CB_GETITEMDATA';
$0151: Result := 'CB_SETITEMDATA';
$0152: Result := 'CB_GETDROPPEDCONTROLRECT';
$0153: Result := 'CB_SETITEMHEIGHT';
$0154: Result := 'CB_GETITEMHEIGHT';
$0155: Result := 'CB_SETEXTENDEDUI';
$0156: Result := 'CB_GETEXTENDEDUI';
$0157: Result := 'CB_GETDROPPEDSTATE';
$0158: Result := 'CB_FINDSTRINGEXACT';
$0159: Result := 'CB_SETLOCALE';
$015A: Result := 'CB_GETLOCALE';
$015B: Result := 'CB_GETTOPINDEX';
$015C: Result := 'CB_SETTOPINDEX';
$015D: Result := 'CB_GETHORIZONTALEXTENT';
$015E: Result := 'CB_SETHORIZONTALEXTENT';
$015F: Result := 'CB_GETDROPPEDWIDTH';
$0160: Result := 'CB_SETDROPPEDWIDTH';
$0161: Result := 'CB_INITSTORAGE';
$0163: Result := 'CB_MULTIPLEADDSTRING';
$0164: Result := 'CB_GETCOMBOBOXINFO';
$0200: Result := 'WM_MOUSEFIRST or WM_MOUSEMOVE';
$0201: Result := 'WM_LBUTTONDOWN';
$0202: Result := 'WM_LBUTTONUP';
$0203: Result := 'WM_LBUTTONDBLCLK';
$0204: Result := 'WM_RBUTTONDOWN';
$0205: Result := 'WM_RBUTTONUP';
$0206: Result := 'WM_RBUTTONDBLCLK';
$0207: Result := 'WM_MBUTTONDOWN';
$0208: Result := 'WM_MBUTTONUP';
$0209: Result := 'WM_MBUTTONDBLCLK';
$020A: Result := 'WM_MOUSEWHEEL or WM_MOUSELAST';
$0210: Result := 'WM_PARENTNOTIFY';
$0211: Result := 'WM_ENTERMENULOOP';
$0212: Result := 'WM_EXITMENULOOP';
$0213: Result := 'WM_NEXTMENU';
$0214: Result := 'WM_SIZING';
$0215: Result := 'WM_CAPTURECHANGED';
$0216: Result := 'WM_MOVING';
$0218: Result := 'WM_POWERBROADCAST';
$0219: Result := 'WM_DEVICECHANGE';
$0220: Result := 'WM_MDICREATE';
$0221: Result := 'WM_MDIDESTROY';
$0222: Result := 'WM_MDIACTIVATE';
$0223: Result := 'WM_MDIRESTORE';
$0224: Result := 'WM_MDINEXT';
$0225: Result := 'WM_MDIMAXIMIZE';
$0226: Result := 'WM_MDITILE';
$0227: Result := 'WM_MDICASCADE';
$0228: Result := 'WM_MDIICONARRANGE';
$0229: Result := 'WM_MDIGETACTIVE';
$0230: Result := 'WM_MDISETMENU';
$0231: Result := 'WM_ENTERSIZEMOVE';
$0232: Result := 'WM_EXITSIZEMOVE';
$0233: Result := 'WM_DROPFILES';
$0234: Result := 'WM_MDIREFRESHMENU';
$0281: Result := 'WM_IME_SETCONTEXT';
$0282: Result := 'WM_IME_NOTIFY';
$0283: Result := 'WM_IME_CONTROL';
$0284: Result := 'WM_IME_COMPOSITIONFULL';
$0285: Result := 'WM_IME_SELECT';
$0286: Result := 'WM_IME_CHAR';
$0288: Result := 'WM_IME_REQUEST';
$0290: Result := 'WM_IME_KEYDOWN';
$0291: Result := 'WM_IME_KEYUP';
$02A1: Result := 'WM_MOUSEHOVER';
$02A2: Result := 'WM_NCMOUSELEAVE';
$02A3: Result := 'WM_MOUSELEAVE';
$0300: Result := 'WM_CUT';
$0301: Result := 'WM_COPY';
$0302: Result := 'WM_PASTE';
$0303: Result := 'WM_CLEAR';
$0304: Result := 'WM_UNDO';
$0305: Result := 'WM_RENDERFORMAT';
$0306: Result := 'WM_RENDERALLFORMATS';
$0307: Result := 'WM_DESTROYCLIPBOARD';
$0308: Result := 'WM_DRAWCLIPBOARD';
$0309: Result := 'WM_PAINTCLIPBOARD';
$030A: Result := 'WM_VSCROLLCLIPBOARD';
$030B: Result := 'WM_SIZECLIPBOARD';
$030C: Result := 'WM_ASKCBFORMATNAME';
$030D: Result := 'WM_CHANGECBCHAIN';
$030E: Result := 'WM_HSCROLLCLIPBOARD';
$030F: Result := 'WM_QUERYNEWPALETTE';
$0310: Result := 'WM_PALETTEISCHANGING';
$0311: Result := 'WM_PALETTECHANGED';
$0312: Result := 'WM_HOTKEY';
$0317: Result := 'WM_PRINT';
$0318: Result := 'WM_PRINTCLIENT';
$031F: Result := 'WM_DWMNCRENDERINGCHANGED';
$0358: Result := 'WM_HANDHELDFIRST';
$035F: Result := 'WM_HANDHELDLAST';
$0380: Result := 'WM_PENWINFIRST';
$038F: Result := 'WM_PENWINLAST';
$0390: Result := 'WM_COALESCE_FIRST';
$039F: Result := 'WM_COALESCE_LAST';
$03E0: Result := 'WM_DDE_FIRST or WM_DDE_INITIATE';
$03E1: Result := 'WM_DDE_TERMINATE';
$03E2: Result := 'WM_DDE_ADVISE';
$03E3: Result := 'WM_DDE_UNADVISE';
$03E4: Result := 'WM_DDE_ACK';
$03E5: Result := 'WM_DDE_DATA';
$03E6: Result := 'WM_DDE_REQUEST';
$03E7: Result := 'WM_DDE_POKE';
$03E8: Result := 'WM_DDE_EXECUTE or WM_DDE_LAST';
$0400: Result := 'WM_USER';
// progress bar
$0401: Result := 'PBM_SETRANGE';
$0402: Result := 'PBM_SETPOS';
$0403: Result := 'PBM_DELTAPOS';
$0404: Result := 'PBM_SETSTEP';
$0405: Result := 'PBM_STEPIT';
$0406: Result := 'PBM_SETRANGE32';
$0407: Result := 'PBM_GETRANGE';
$0408: Result := 'PBM_GETPOS';
$0409: Result := 'PBM_SETBARCOLOR';
$040A: Result := 'PBM_SETMARQUEE';
$040D: Result := 'PBM_GETSTEP';
$040E: Result := 'PBM_GETBKCOLOR';
$040F: Result := 'PBM_GETBARCOLOR';
$0410: Result := 'PBM_SETSTATE';
$0411: Result := 'PBM_GETSTATE';
// misc
$0469: Result := 'UDM_SETBUDDY';
$046A: Result := 'UDM_GETBUDDY';
$102C: Result := 'LVM_GETITEMSTATE';
$8000: Result := 'WM_APP';
else
Result := 'Unknown(' + IntToStr(WM_Message) + ')';
end; {Case}
end;
参考：http://vcl-styles-utils.googlecode.com/svn-history/r111/trunk/Common/Vcl.Styles.InnoSetup.pas