How to download/grap web pages or XML document at internet website in Delphi XE? If you are considering Delphi XE as cross compiler for the multiple platforms such as Android, iOS, and Windows, you need to have the standard method to get web content such as the normal text, or XML document as a result of RESTful API.Delphi provides the... |
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SQL to Select a random row from a database table There are lots of ways to select a random record or row from a database table. Here are some example SQL statements that don't require additional application logic, but each database server requires different SQL syntax.Select a random row with MySQL: SELE... |
Setting TQuery SQL Statement This source code sets the SQL String in Query1. As it fits on one line we just use SQL[0].The SQL statement finds all the fields from the Article table where the user_id field is equal to a varaible Text value dbtUser.Text.A better way would be to use Para... |
Stack Tutorial In C# stack is a LIFO (Last In First Out) queue, so if you add two items and then ask for an item you would get the second item then the first item. To add items to the Stack you use Push method. This method takes an object of any type but to keep things simple ... |
Queue Tutorial In C# Adding Items to the QueueTo add items to the Queue you use Enqueue method. This method takes an object of any type but to keep things simple lets just give it a string object: Queue q = new Queue();q.Enqueue("So");q.Enqueue("This");q.Enqueue("Is");q.Enqueu... |
Create PDF Files On the Fly In C Sharp Creation of PDF Document in 5 easy stepsStep 1: First create an instance of document objectDocument myDocument= new Document(PageSize.A4.Rotate());Step 2: Now create a writer that listens to this doucment and writes the document to desired Stream.PdfWriter... |
How to call Visual C/C++ implemented DLL functions in C# - Simple DLLImport Managed world is beautiful, I have all classes I want in FrameWork.. But what if I want call some unmanaged code? For instance, I have DLL written in C++, and want use it from C#. Let's look some code. Our DLL exports some function, in CDecl convention, th... |
Send Email Using C# A code snippet,posted on the dotnet newsgroup,about how to send email using C#.<%@Import |
How To Read And Write A Cookie A post on aspngbeta about readingwriting a cookie in C#//To setHttpCookie cookie;String UserID = "foo";cookie = new HttpCookie("UserID");cookie.Values.Add("UserID",UserID);Response.Cookies.Add(cookie);//To readHttpCookie cookie;cookie = Request.Cookies["Us... |
Using C# With Cookies A code snippet posted on aspcs about accessing and writing cookies using C#./* Read shopper id from client cookie */public static bool GetCurrentShopperId(ref string id,System.Web.HttpRequest request){try{HttpCookie cookie = request.Cookies["iparts_pa"];if... |
How Do I Remove The Application Icon From The Taskbar? To remove the icon from the taskbar, you need to call a Windows API call:BOOL ShowWindow(HWND hwnd,int nCmdShow);Delphi makes it very easy to use this command. All you need to do is supply the Application.handle and SW_HIDE to remove the icon from the task... |
How To Show The Print Dialog And Print Text Files This code show an example of how to print a text of a RichEdit component.unit Unit1; interface uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ComCtrls; type TForm1 = class(TForm) ... |
How To Make An Animated Application Icon Show how to create an animated icon in your programvar icon1:Boolean; ... procedure TForm1.Timer1Timer(Sender: TObject); begin if icon1=false then begin Application.icon:=Image1.Picture.Icon; icon1:=tru... |
How To Pass The Focus To The Next/prior Control Shows how to activate the next or prior control in a formnext control: SendMessage(Form1.Handle, WM_NEXTDLGCTL, 0, 0); prior control: SendMessage(Handle, WM_NEXTDLGCTL, 1, 0); |
How To Make Rounded Windows Create a different form in your application...procedure TForm1.FormCreate(Sender:TObject); var region: HRgn; begin region:=CreateEllipticRgn(1,1,200,200); SetWindowRgn(handle, region, true); end; |
How To Get Windows Uptime Find how long Windows has been working...function UpTime: string; const ticksperday : integer = 1000 * 60 * 60 * 24; ticksperhour : integer = 1000 * 60 * 60; ticksperminute : integer = 1000 * 60; tickspersecond : integer = 1000; var t : longword; &nb... |
How To Find Out Total And Available Memory Get the total and available memory in your system. (Total free memory space in your system)procedure TForm1.Button1Click(Sender: TObject); var memory:TMemoryStatus; begin memory.dwLength:=sizeof(memory); GlobalMemoryStatus(memory); &nb... |
How To Change The System Time This code shows how to set the system time to another value.procedure TForm1.Button1Click(Sender: TObject); var systemtime : TSystemTime; NewTime:string; begin NewTime:='13:58:00'; DateTimeToSystemTime( D... |
How To Get The Windows OS Version Identify the Windows version of your systemfunction GetWindowsVersion : string; var OsVinfo : TOSVERSIONINFO; HelpStr : array[0..50] of char; begin ZeroMemory(@OsVinfo,sizeOf(OsVinfo));... |
How To Change The Desktop Wallpaper Change the wallpaper of your system by codeuses Registry, WinProcs; procedure SetWallpaper( sWallpaperBMPPath : String; bTile : boolean );&... |
How To Get The Windows Language Obtains the language that Windows is using.function Language:string; var sLangID:LangID; sLanguage: array [0..100] of char; begin sLangID:=GetSystemDefaultLangID; VerLanguageName(sLangID,sLang... |
How To Make A Gradient Filled Form Show how to paint a form in a different way...procedure TForm1.FormPaint(Sender: TObject); var Row, Ht: Word; IX: Integer; begin iX :=200 ; Ht:=(ClientHeight + 512) div 256; for Row := 0 to 512 do begin &nbs... |
How can I hide the caption bar on a form? To hide the caption bar you need to override on of the default form methods CreateParams (this also exists for other objects).The CreateParams method initializes a window-creation parameter record passed in the Params parameter (ref:Delphi Help).Go to the ... |
How To Send An E-mail By Code Use this function to send an e-mail through your program. You must have the component TNMSMTP from FastNet tools. This component is included in Delphi 4-5 Professional and Enterpriseprocedure TForm1.Button1Click(Sender: TObject); begin NMSMTP1.Host ... |
How To Open Url In Default Webbrowser Use this function to open your browser with a given URL.uses shellapi; .... procedure TForm1.Label1Click(Sender:TObject); begin shellexecute(handle,'open','http://www.swissdelphicenter.ch', nil,nil,sw_show); ... |
How To Check If A Soundcard Is Installed Use this code to verify if a soundcard is installed in your systemuses mmsystem; ... function Soundkarte:Boolean; begin Result := WaveOutGetNumDevs >0; end; |
How To Change Screen Resolution Change the resolution of your screen.Actually I've ever used this function for TV-based software development, because of TV-resolution.{ The function NewRes can have the following result: DISP_CHANGE_SUCCESSFUL The settings change was successful. DISP_CHAN... |
How To Force The Correct Decimal Separator Some English speaking countries use the "point" as decimal separator, while the rest of the world is using the "comma". How can you make sure that the user will press the correct key when entering a number with a decimal fraction? With the code in this exa... |
How To Register Own File Types Use the registry to register your own filetypeuses registry; procedure TForm1.RegisterFileType(prefix:String; exepfad:String); var reg:TRegistry; begin reg:=TRegistry.Create; reg.RootKey:=HKEY_CLASSES_ROOT; |
How To Get Volume Name Obtains the volume name of a indicated drivefunction VolumeName(Laufwerk: Char): string; var max, Flags: DWORD; Buf: array [0..MAX_PATH] of Char; begin try GetVolumeInformation(PChar(Laufwerk + ':'), Buf, sizeof(Buf), nil, max, F... |