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...get the Default browser?
Autor: Thomas Stutz
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Tip Rating (15):  
     


{1.}

{
  First we create a temporary file and call the
  function FindExecutable to get the associated Application.

  Es wird eine temporäre Datei (*.htm) erstellt und dann die
  Funktion FindExecutable aufgerufen. Diese liefert dann die
  Anwendung, welche mit der Endung .htm verknüpft ist.
}


function GetAppName(Doc: string): string;
var
  
FN, DN, RES: array[0..255] of char;
begin
  
StrPCopy(FN, DOC);
  DN[0]  := #0;
  RES[0] := #0;
  FindExecutable(FN, DN, RES);
  Result := StrPas(RES);
end;

function GetTempFile(const Extension: string): string;
var
  
Buffer: array[0..MAX_PATH] of char;
  aFile: string;
begin
  
GetTempPath(SizeOf(Buffer) - 1, Buffer);
  GetTempFileName(Buffer, 'TMP', 0, Buffer);
  SetString(aFile, Buffer, StrLen(Buffer));
  Result := ChangeFileExt(aFile, Extension);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  
f: System.Text;
  temp: string;
begin
  
// get a unique temporary file name
  // eine eindeutige Temporäre Datei bekommen
  
temp := GetTempFile('.htm');
  // Create the file
  // Datei erstellen
  
AssignFile(f, temp);
  rewrite(f);
  closefile(f);
  // Show the path to the browser
  // Pfad + Programmname zum Browser anzeigen.
  
ShowMessage(GetAppName(temp));
  // Finally delete the temporary file
  // Temporaäre Datei wieder löschen
  
Erase(f);
end;

{2.}

//Using the Registry:
//************************************************

uses
  
Registry;

procedure TForm1.Button1Click(Sender: TObject);
var
  
Reg: TRegistry;
  KeyName: string;
  ValueStr: string;
begin
  
Reg := TRegistry.Create;
  try
    
Reg.RootKey := HKEY_CLASSES_ROOT;
    KeyName     := 'htmlfile\shell\open\command';
    if Reg.OpenKey(KeyName, False) then
    begin
      
ValueStr := Reg.ReadString('');
      Reg.CloseKey;
      ShowMessage(ValueStr);
    end
    else
      
ShowMessage('There isn't a default browser');
  finally
    
Reg.Free;
  end;
end;

{3.}

//************************************************
{Copyright (c) by Code Central}

type
  
TBrowserInformation = record
    
Name: string;
    Path: string;
    Version: string;
  end;

function LongPathName(ShortPathName: string): string;
var
  
PIDL: PItemIDList;
  Desktop: IShellFolder;
  WidePathName: WideString;
  AnsiPathName: AnsiString;
begin
  
Result := ShortPathName;
  if Succeeded(SHGetDesktopFolder(Desktop)) then
  begin
    
WidePathName := ShortPathName;
    if Succeeded(Desktop.ParseDisplayName(0, nil, PWideChar(WidePathName),
      ULONG(nil^), PIDL, ULONG(nil^))) then

      try
        
SetLength(AnsiPathName, MAX_PATH);
        SHGetPathFromIDList(PIDL, PChar(AnsiPathName));
        Result := PChar(AnsiPathName);

      finally
        
CoTaskMemFree(PIDL);
      end;
  end;
end;

function GetDefaultBrowser: TBrowserInformation;
var
  
tmp: PChar;
  res: LPTSTR;
  Version: Pointer;
  VersionInformation: Pointer;
  VersionInformationSize: Integer;
  Dummy: DWORD;
begin
  
tmp := StrAlloc(255);
  res := StrAlloc(255);
  Version := nil;
  try
    
GetTempPath(255, tmp);
    if FileCreate(tmp + 'htmpl.htm') <> -1 then
    begin
      if 
FindExecutable('htmpl.htm', tmp, res) > 32 then
      begin
        
Result.Name := ExtractFileName(res);
        Result.Path := LongPathName(ExtractFilePath(res));
        // Try to determine the Browser Version
        
VersionInformationSize := GetFileVersionInfoSize(Res, Dummy);
        if VersionInformationSize > 0 then
        begin
          
GetMem(VersionInformation, VersionInformationSize);
          GetFileVersionInfo(Res, 0, VersionInformationSize, VersionInformation);
          VerQueryValue(VersionInformation, ('StringFileInfo040904E4ProductVersion'),
            Pointer(Version), Dummy);
          if Version <> nil then
            
Result.Version := PChar(Version);
          FreeMem(VersionInformation);
        end;
      end
      else
        
ShowMessage('Can''t determine the executable.');
      SysUtils.DeleteFile(tmp + 'htmpl.htm');
    end
    else
      
ShowMessage('Can''t create temporary file.');
  finally
    
StrDispose(tmp);
    StrDispose(res);
  end;
end;




 

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