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...flash a window a number of times?
Autor: Thai Huynh
[ Print tip ]  

Tip Rating (10):  
     


// Define FLASHWINFO structure as record type
type
  
FLASHWINFO = record
    
cbSize: UINT;
    hWnd: HWND;
    dwFlags: DWORD;
    uCount: UINT;
    dwTimeOut: DWORD;
  end;
  TFlashWInfo = FLASHWINFO;

  // Define dwFlags constants
const
  
FLASHW_STOP = 0;
  FLASHW_CAPTION = 1;
  FLASHW_TRAY = 2;
  FLASHW_ALL = FLASHW_CAPTION or FLASHW_TRAY;
  FLASHW_TIMER = 4;
  FLASHW_TIMERNOFG = 12;

var
  
Form1: TForm1;
  FWInfo: TFlashWInfo;

  // Function declaration for WinAPI call
function FlashWindowEx(var pfwi: FLASHWINFO): BOOL; stdcall;

  {...}

implementation

{...}

// Import external function from 'USER32.DLL' with the same name
function FlashWindowEx; external user32 Name 'FlashWindowEx';

procedure TForm1.FormCreate(Sender: TObject);
begin
  
// Check for API function's availability
  
if not Assigned(@FlashWindowEx) then
  begin
    
ShowMessage('API Function FlashWindowEx is not present... Exit program!');
    Application.Terminate;
  end
  else
    
// Set default parameters
    
with FWInfo do
    begin
      
cbSize    := SizeOf(FWInfo);  // Size of structure in bytes
      
hWnd      := Form1.Handle;      // Main's form handle
      
dwFlags   := FLASHW_ALL;     // Flash both caption & task bar
      
uCount    := 10;              // Flash 10 times
      
dwTimeOut := 100;          // Timeout is 1/10 second apart
    
end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  
// Flash on normal state
  
FlashWindowEx(FWInfo);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  
// Flash on minimized state
  
WindowState := wsMinimized;  // Application.Minimize;
  
FlashWindowEx(FWInfo);
end;


 

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