Q:如何開啟內定的瀏覽器及電子郵件程式?
A:使用 ShellExecute。該函式定義於 Delphi 的 ShellApi.pas 中:

  function ShellExecute(hWnd: HWND; Operation, FileName, 
    Parameters, Directory: PChar; ShowCmd: Integer): HINST; stdcall;

  參數:
    hWnd:      handle to parent window 
    Operation: pointer to a string that specifies the operation to
               perform. 
               The valid strings are "open" and "print" to open or 
               print the file specified by "FileName". 
    FileName:  pointer to a filename string 
    Parameter: pointer to a string that specifies the 
               executable-file parameters 
    Directory: pointer to a string that specifies the default 
               directory 
    ShowCmd:   specifies how the application is to be shown when it 
               is opened

  如果 FileName 指定的檔案是一個文件的話，ShowCmd 要設為 0。

  開啟電子郵件程式:
    ShellExecute(handle, 'open', 'Mailto:'', nil, nil, SW_SHOWNORMAL);

  開啟瀏覽器: 
    ShellExecute(handle, 'open', 'http://www.mypage.com'', nil, 
      nil, SW_SHOWNORMAL);

  以下為加上錯誤處理的函式:

procedure ExploreWeb(handle:HWND ;page: PChar); 
var 
  ReturnValue: integer; 
begin 
  ReturnValue := ShellExecute(handle, 'open', page, nil, nil, 
    SW_SHOWNORMAL); 
  if ReturnValue <= 32 then 
    case Returnvalue of 
      0: ShowMessage('Error: Out of Memory'); 
      ERROR_FILE_NOT_FOUND: ShowMessage('Error: File not found');
      ERROR_PATH_NOT_FOUND: ShowMessage('Error: Directory not');
      ERROR_BAD_FORMAT    : ShowMessage('Error: Wrong format in EXE');
      // All other errors . See help for more ReturnValues of 
      // ShellExecute 
    else                    
      ShowMessage('Error: '+IntToStr(Returnvalue)+' in ShellExecute'); 
    end //case 
end;

使用範例: ExploreWeb(handle,'http://www.myweb.de/help.htm'); 

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