本文整理自网络，侵删。
手头的程序需要修改注册表, 以让当前程序成为某格式的默认打开程序并关联图标; Vista 之后需要管理员权限才能操作注册表, 很麻烦, 所以有了下面的尝试.
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unit Unit1;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;
type
TForm1 = class(TForm)
Memo1: TMemo;
Button1: TButton;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses System.IOUtils, Winapi.ShellAPI, Winapi.ShlObj; //RegApp 函数用到的单元
//关联默认程序的函数
procedure RegApp(const aExt, aAppName, aAppPath: string);
const
nRegFmt = 'Windows Registry Editor Version 5.00' + sLineBreak +
'[HKEY_CLASSES_ROOT\%0:s]' + sLineBreak +
'@="%1:s"' + sLineBreak +
'[HKEY_CLASSES_ROOT\%1:s\DefaultIcon]' + sLineBreak +
'@="%2:s,0"' + sLineBreak +
'[HKEY_CLASSES_ROOT\%1:s\shell]' + sLineBreak +
'[HKEY_CLASSES_ROOT\%1:s\shell\open]' + sLineBreak +
'[HKEY_CLASSES_ROOT\%1:s\shell\open\command]' + sLineBreak +
'@="%3:s"';
var
RegStr: string;
str3, str4: string;
RegTmpFile: string;
begin
str3 := aAppPath.Replace('\', '\\');
str4 := Format('"%s" "%%1"', [str3]).Replace('"', '\"');
RegStr := Format(nRegFmt, [aExt, aAppName, str3, str4]);
RegTmpFile := TPath.GetTempPath + 'RegTmp.reg';
with TStringList.Create do begin
Text := RegStr;
SaveToFile(RegTmpFile);
Free;
end;
ShellExecute(0, nil, PChar(RegTmpFile), nil, nil, SW_SHOWNORMAL);
SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, nil, nil); //刷新图标显示
end;
procedure TForm1.FormCreate(Sender: TObject);
var
S: string;
begin
S := ParamStr(1);
if FileExists(S) then Memo1.Lines.LoadFromFile(S);
end;
//执行注册函数; 执行后, 可随便修改一个文本文件的后缀为 tst, 然后双击测试
procedure TForm1.Button1Click(Sender: TObject);
begin
RegApp('.tst', 'MyApp1', Application.ExeName); //假定程序名称是 MyApp1, 要打开的文件的后缀是 .tst
end;
end.
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来源：http://www.cnblogs.com/del/p/3182126.html 相关阅读 >>
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