谈Delphi编程中资源文件的应用(4)

为了使程序更加美观,我们再添加一个小图标,同时这也将是我们程序的图标.选择InsertResourceIconImport,选择一个图标文件.并将它的ID设置为"MAINICON"(注意:必须把双引号写上而且字母为大写),为窗口添加一个Picture控件并设置它的属性Type:Icon,Image下拉选择刚才的图标MainIcon即可.
如果你想为程序在鼠标添加一些信息也是可以的.选择InsertResourceVersion即可.
到这里我们已经完成了一个简单的"安装程序"的窗体设计.实际上我们现在就可以在Delphi中调用它了.我们先把"劳动成果"保存起来.选择FileSave As,在文件类型里选择"32-bit Resource File(.res)"保存为"Demo.res",文件大小大约为2.65KB.
新建一个扩展名为dpr的文本文件MyDemo.Dpr,键入如下代码:
Uses Windows,Messages;
{$R Demo.Res}
function MainDialogProc(DlgWin:hWnd;DlgMessage:UINT;DlgWParam:WPARAM;DlgLParam:LPARAM):integer;stdcall;
begin
Result := 0;
case DlgMessage of
WM_Close:
begin
PostQuitMessage(0);
Exit;
end;
end;
end;
begin
DialogBox(hInstance, ''''MAINFORM'''', 0, @MainDialogProc);
end.
用Delphi打开它编译一次即可产生一个大小为19KB的EXE.是不是很小!实际上,你甚至只用一行代码就把它Show出来,不过程序无法关闭而已.
Uses Windows;
{$R Demo.Res}
function MainDialogProc: integer;
begin
Result := 0;
end;
begin
DialogBox(hInstance, ''''MAINFORM'''', 0, @MainDialogProc);
end.
上面的程序只不过是一个空窗口而已,现在我们来写代码响应按下相应按钮响应的事件.完整代码如下:
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);

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