Flashing a window means changing the appearance of its caption bar as if the window were changing from inactive to active status, or vice versa.Typically, a window is flashed to inform the user that the window requires attention but that it does not curren...
Here's how to use a TTF (true type font) in your Delphi application without having to install it in Windows:1. In the OnCreate event for the main form in your Delphi application call the AddFontResource API function. The AddFontResource function adds the f...
Here's how to enable or disable the "Show window contents while dragging" Windows fature from Delphi code://To Show window contents while dragging:SystemParametersInfo(SPI_SETDRAGFULLWINDOWS, 1, nil, 0) ;//To disable this option call the function:SystemPar...
If you want to save the text data contained in the Clipboard to a text file on a disk, use the next code:{Usage:ClipboardTxtToFile(c:dircliptext.txt)}uses Clipbrd;function ClipboardTxtToFile (sFileTXT : string) : boolean;va...
The following code is used to insert a character into another application - Notepad.procedure TForm1.Button1Click(Sender: TObject) ;var g,d:integer;begin {Find the main window of the Application} g:=FindWindow('Notepad',nil) ; {Find the w...
Put a TMemo (Memo1) and a TButton (Button1) in your form. Put this code into OnClick of Button1:procedure TForm1.Button1Click(Sender: TObject) ; var MemoryStatus: TMemoryStatus; begin Memo1.Lines.Clear; MemoryStatus.dwLength := SizeOf(MemoryS...
Here's how to restrict the mouse movement to a form and release this restriction after a click on a form:procedure TForm1.FormCreate(Sender: TObject) ;var r : TRect;begin
The following procedure will list all the devices on your computer. You can then extract the com ports and printer ports by looking for the 'COM' and 'LPT' characters in the list.Add a Memo and a Button and place this code in the OnClick of a button...proc...
Given a font's name (such as Arial,Verdana, Times New Roman, etc), function returns a boolean value indicating whether the font is or isn't a True Type font.function IsTrueTypeFont(FontName : string):boolean;const PITCH_MASK: byte = $0F;var TxM...
Suppose you have a data-critical type of application where you would not want a non-authored user to work with the data. Such an application could automatically log out the current user if no user activity has taken place in a lengthy time.To track a user'...
If you need to hide your application from the Windows TaskBar, you can use the following trick:procedure TForm1.FormCreate(Sender: TObject) ;begin ShowWindow(Application.Handle, SW_HIDE) ; SetWindowLong(Application.Handle, GWL_EXSTY...
Here's an example of how to play simple sounds on the PC speaker procedure SetPort(address, Value: Word) ; var bValue: Byte; begin bValue := trunc(Value and 255) ; asm mov dx, address mov al, bValue &...
If you need to install an "inf" file using Delphi, you could use the next code: { Usage: InstallINF('C:XYZ.inf', 0) ; } uses ShellAPI; function InstallINF(const PathName: string; hParent: HWND): Boolean; var instance: HINST; begin &nbs...
When you write a console mode application (no GUI), the output by default goes to the screen, but this can be overridden by the process starting the app (see: How to capture the output from a console mode application).Use the code below to find where the o...
This form has 3 labels and a timer component:unit unit1; interface uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls; type TForm1 = class(TForm) Timer1: TTimer; ...
If you need to find the dimensions of user's screen in pixels, after subtracting any space occupied by the task bar and any tool bars that sit on the desktop, use the WorkAreaHeight adnd WorkAreaWidth properties of the TScreen object. The following code de...
"If I use the Windows Explorer to copy a file, how can I use the paste function in my application?" This code retrieves the filenames from the clipboard to a memo component. Drop a memo and a button on a form and set the OnClick of a button to: uses ...
Here's how to get the Windows version from Delphi code:type TWinVersion = (wvUnknown, wvWin95, wvWin98, wvWin98SE, wvWinNT, wvWinME, wvWin2000, wvWinXP, wvWinVista) ; ... function GetWinVersion: TWinVersion; var osVerInfo: TOSVersionInfo; maj...
If you wish to disable those key combinations while your application is running call SystemKeys. When you call SystemKeys, if Disable is True, the keys will be disabled, False otherwise.Note: the code does NOT work under Win NT systems (XP, 2000)procedure ...
Here's the code that will display the standard Windows Properties dialog for a specified file (object) name.Usage:ShowProperties(Application.Handle, 'c:autoexec.bat')Here's the function source.function ShowProperties(hWndOwner: HWND; const FileName: string...
The BlockInput API function blocks keyboard and mouse input events from reaching applications. Place a Button (name: "Button1") on a form (name: "Form1") and use this code for the button's OnClick event handler. Once you click the button your mouse and key...
When Windows is about to shut down, it sends a WM_QueryEndSession to all open applications. To detect (and prevent shutdown) , we must define a message handler to this message. Put this definition on the private section of the main form:procedure WMQueryEn...
The following example demonstrates using the SHFileOperation function to copy a group of files and display a progress dialog. You can also use the following flags to delete, move and rename a group of files. FO_COPY FO_DELETE FO_MOVE FO_RENAME Note: The bu...
Sometimes you want to deactivate the current screensaver when performing some very long process. You can use this function to activate or deactivate the screensaver. Pass True to activate it, or False to deactivate it.function ActivateScreenSaver(Activate:...
Here's an example of controling the sound volume from Delphi: uses MMSystem; type TVolumeRec = record case Integer of 0: (LongVolume: Longint) ; 1: (LeftVolume, RightVolume : Word) ; &nb...
To programmatically close another application, send to the application a WM_QUIT message. "Window caption" is the caption of the window that you are sending the message to. Usage: if not KillApp('Window caption') then ShowMessage('App not closed') ;Here's ...
Here's how to chane the bitmap on the Windows Start button:{We'll need several global variables}var Form1: TForm1; StartButton : hWnd; OldBitmap : THandle; NewImage : TPicture;...{Now, we put this code in...
The example runs 'chkdsk.exe c:' and displays the output to Memo1.Put a TMemo (Memo1) and a TButton (Button1) on your form. Put this code in the OnCLick event procedure for Button1:procedure TForm1.Button1Click(Sender: TObject) ; procedure RunDosInMe...
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