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Uses Windows;
{$R Demo.Res}
function MainDialogProc: integer;
begin
Result := 0;
end;
begin
DialogBox(hInstance, 'MAINFORM', 0, @MainDialogProc);
end

program MyDemo;
uses Windows, Messages, shlobj;
const
ID_Edit = 10001;
ID_Selet = 10002;
ID_Setup = 10003;
ID_Quit = 10004;
ID_Exit = 10005;
{$R Demo.Res}
var
MainWin: HWND;

function My_Gettext: string;
var
Textlength: Integer;
Text: PChar;
s: string;
begin
TextLength := GetWindowTextLength(GetDlgItem(MainWin, ID_Edit));
GetMem(Text, TextLength + 1);
GetWindowText(GetDlgItem(MainWin, ID_Edit), Text, TextLength + 1);
s := text;
FreeMem(Text, TextLength + 1);
Result := s;
end;

function Getmyname: string;
var
i, j: integer;
begin
J := 3;
for i := 1 to length(ParamStr(0)) do
if ParamStr(0)[i] = '\' then J := I;
Result := copy(ParamStr(0), J + 1, length(ParamStr(0)) - J);
end;

function SelectDirectory(handle: hwnd; const Caption: string; const Root:WideString;outDirectory:string): Boolean;
var
lpbi: _browseinfo;
buf: array[0..MAX_PATH] of char;
id: ishellfolder;
eaten, att: cardinal;
rt: pitemidlist;
initdir: pwidechar;
begin
result := false;
lpbi.hwndOwner := handle;
lpbi.lpfn := nil;
lpbi.lpszTitle := pchar(caption);
lpbi.ulFlags := BIF_RETURNONLYFSDIRS + BIF_EDITBOX;
SHGetDesktopFolder(id);
initdir := pwchar(root);
id.ParseDisplayName(0, nil, initdir, eaten, rt, att);
lpbi.pidlRoot := rt;
getmem(lpbi.pszDisplayName, MAX_PATH);
try
result := shgetpathfromidlist(shbrowseforfolder(lpbi), buf);
except
freemem(lpbi.pszDisplayName);
end;
if result then
begin
directory := buf;
if length(directory) <> 3 then directory := directory + '\';
end;
end;

function MainDialogProc(
DlgWin: hWnd;
DlgMessage: UINT;
DlgWParam: WPARAM;
DlgLParam: LPARAM
)
: integer; stdcall;
var
MyIcon: HICON;
Sdir: string;
begin
Result := 0;
case DlgMessage of
WM_INITDIALOG:
begin
MyIcon := LoadIcon(hInstance, 'MainIcon');
SetClassLONG(DlgWin, GCL_HICON, MyIcon);
MainWin := DlgWin;
end;
WM_Close:
begin
PostQuitMessage(0);
Exit;
end;
WM_COMMAND:
case LOWORD(DlgWParam) of

ID_Selet:
begin
if SelectDirectory(DlgWin, '请选择安装目录', '', Sdir)
then SendMessage(GetDlgItem(DlgWin, ID_Edit), WM_SETTEXT, 0, lParam(pChar(Sdir)));
end;
ID_Setup:
begin
if My_Gettext = '' then
begin
MessageBox(DlgWin, '请先选择安装文件夹!', '信息', MB_ICONINFORMATION + MB_OK);
Exit;
end;
CopyFile(pchar(ParamStr(0)), pchar(My_Gettext + Getmyname), false);
MessageBox(DlgWin, '安装完毕!', '信息', MB_ICONINFORMATION + MB_OK);
PostQuitMessage(0);
Exit;
end;
ID_Quit:
begin
PostQuitMessage(0);
EXIT;
end;
ID_Exit:
begin
if MessageBox(DlgWin, '你点击了菜单“退出”，你确定退出程序吗?', '信息', MB_ICONQUESTION + MB_OKCANCEL) = IDOK then
PostQuitMessage(0);
Exit;
end;
end;
end;
end;
begin
DialogBox(hInstance, 'MAINFORM', 0, @MainDialogProc);
end