Dosya Kopyalama (1)

Procedure FileCopy( Const sourcefilename, targetfilename: String );
Var
S, T: TFileStream;
Begin
S := TFileStream.Create( sourcefilename, fmOpenRead );
try
T := TFileStream.Create( targetfilename,
fmOpenWrite or fmCreate );
try
T.CopyFrom(S, S.Size );
finally
T.Free;
end;
finally
S.Free;
end;

End;

Dosya Kopyalama (2)

procedure FileCopy(const FromFile, ToFile: string);
var
FromF, ToF: file;
NumRead, NumWritten: Word;
Buf: array[1..2048] of Char;
begin
AssignFile(FromF, FromFile);
Reset(FromF, 1); { Record size = 1 }
AssignFile(ToF, ToFile); { Open output file }
Rewrite(ToF, 1); { Record size = 1 }
repeat
BlockRead(FromF, Buf, SizeOf(Buf), NumRead);
BlockWrite(ToF, Buf, NumRead, NumWritten);
until (NumRead = 0) or (NumWritten <> NumRead);
CloseFile(FromF);
CloseFile(ToF);
end;

Dosya Kopyalama (3)

procedure CopyFile(FromFileName, ToFileName: string);
var
FromFile, ToFile: File;
begin
AssignFile(FromFile, FromFileName); { Assign FromFile to FromFileName }
AssignFile(ToFile, ToFileName); { Assign ToFile to ToFileName }
Reset(FromFile); { Open file for input }
try
Rewrite(ToFile); { Create file for output }
try
if LZCopy(TFileRec(FromFile).Handle, TFileRec(ToFile).Handle) < 0
then
raise EInOutError.Create(’Error using LZCopy’)
finally
CloseFile(ToFile); { Close ToFile }
end;
finally
CloseFile(FromFile); { Close FromFile }
end;
end;

Directory Adı değiştirme

SysUtils unitesinin içindeki RenameFile function bu işi görmektedir.

Treeview componentinin durumunu kaydetme ve gösterme

Kaydetmek için

TreeView.SaveToFile(’Dosya.adı’);

Dosyayı açmak için

TreeView.LoadFromFile(’Dosya.adı’);

Dosyayı yanlızca okumak (read only) şeklinde açma

AssignFile(F, Dosya);
FileMode := 0; (read only modunda açmak}
Reset(F);
.
.
.
CloseFile(F);

Açılan dosyanın tarih ve zamanını ayarlamak


var
f: file;
begin
Assign(f, DirInfo.Name);
Reset;
SetFTime(f, Time);
Close;
end;

Deltree

{$I-} {$I+}

procedure delTree (DirName: string);
var
FileSearch: SearchRec;
begin

chDir (DirName);
FindFirst (’*.*’, Directory, FileSearch);
while (DosError = 0) do begin
if (FileSearch.name <> ’.’) AND (FileSearch.name <> ’..’) AND
( (FileSearch.attr AND Directory) <> 0)
then begin
if DirName[length(DirName)] = ’\’ then
delTree (DirName+FileSearch.Name)
else
delTree (DirName+’\’+FileSearch.Name);
ChDir (DirName);
end;
FindNext (FileSearch)
end;


FindFirst (’*.*’, AnyFile, FileSearch);
while (DosError = 0) do begin
if (FileSearch.name <> ’.’) AND (FileSearch.name <> ’..’) then
Remove (workdir);
end;
FindNext (FileSearch)
end;
rmDir (DirName)
end;

Dbgrid’de (Ctrl-Del diyince) dosya silmesini engelleme

if (ssctrl in shift) and (key=vk_delete) then
begin
key:=0;
end;

String’i renk’e renk’i stringe çevirme

Uses graphics;
form1.Color:=stringtocolor(’121’);
label1.caption:= ColorToString(form1.color);

Mouse’un yerini değiştirmek

randomize;
SetCursorPos(random(100),random(100));

ComboBox’ın aşağıya listelemesinin farklı bir yolu (DropComboBox)

SendMessage(ComboBox1.handle , 1039, 1, 0);

Başlığı Gizlemek ve Göstermek

Procedure HideTitlebar;
Var
Save : LongInt;
Begin
If form1.BorderStyle=bsNone then Exit;
Save:=GetWindowLong(form1.Handle,gwl_Style);
If (Save and ws_Caption)=ws_Caption then Begin
Case form1.BorderStyle of
bsSingle,
bsSizeable : SetWindowLong(form1.Handle,gwl_Style,Save and
(Not(ws_Caption)) or ws_border);
bsDialog : SetWindowLong(form1.Handle,gwl_Style,Save and
(Not(ws_Caption)) or ds_modalframe or ws_dlgframe);
End;
form1.Height:=form1.Height-getSystemMetrics(sm_cyCaption);
form1.Refresh;
End;
end;

Procedure ShowTitlebar;
Var
Save : LongInt;
begin
If form1.BorderStyle=bsNone then Exit;
Save:=GetWindowLong(form1.Handle,gwl_Style);
If (Save and ws_Caption)<>ws_Caption then Begin
Case form1.BorderStyle of
bsSingle,
bsSizeable : SetWindowLong(form1.Handle,gwl_Style,Save or ws_Caption or
ws_border);
bsDialog : SetWindowLong(form1.Handle,gwl_Style,Save or ws_Caption or
ds_modalframe or ws_dlgframe);
End;
form1.Height:=form1.Height+getSystemMetrics(sm_cyC aption);
form1.Refresh;
End;
end;

GradientFill (eyimli renk) kullanımı

Önce uses bölümüne chart ekleyin.
Formun üstüne bir tane image componenti yerleştirin ve formun create olayına aşağıdaki kodu yazın.

procedure TForm1.FormCreate(Sender: TObject);
begin
GradientFill(Image1.Canvas,Image1.ClientRect,clred ,clblue,false);
end;

Küçük bir kolaylık ctrl-space

Delphide eşitlik kurucağınız zaman ctrl-space’e bastığınızda verebileceğiniz değerleri göstermektedir.
Label1.caption:= (burada ctrl-space bastığınızda verebileceğiniz değerleri görürsünüz)


Dbf dosyasını pack etmek (silinen dosyaları diskten silmek)

Table1.Exclusive := True;
Table1.Active := True;
Error := DbiPackTable(Table1.DBHandle, Table1.Handle, nil, szdBASE, True);
Table1.Active := False;
Table1.Exclusive := False;

BDE’ nin yüklü olup olmadığını anlamak
HKEY_LOCAL_MACHINE\Software\Borland\Database Engine bölümü bde’ye ayrılmıştır ve yüklü olup olmadığını aşağıdaki değerleri kontrol ederek bulabilirsiniz.

DLLPATH
CONFIGFILE01

Clipboard’a kopyalama ve yapıştırma (copy,past)
procedure CopyButtonClick(Sender: TObject);
begin
If ActiveControl is TMemo then TMemo(ActiveControl).CopyToClipboard;
If ActiveControl is TDBMemo then TDBMemo(ActiveControl).CopyToClipboard;
If ActiveControl is TEdit then TEdit(ActiveControl).CopyToClipboard;
If ActiveControl is TDBedit then TDBedit(ActiveControl).CopyToClipboard;
end;

procedure PasteButtonClick(Sender: TObject);
begin
If ActiveControl is TMemo then TMemo(ActiveControl).PasteFromClipboard;
If ActiveControl is TDBMemo then TDBMemo(ActiveControl).PasteFromClipboard;
If ActiveControl is TEdit then TEdit(ActiveControl).PasteFromClipboard;
If ActiveControl is TDBedit then TDBedit(ActiveControl).PasteFromClipboard;
end;

TStringgrid’i kaydetme ve açma

Procedure SaveGrid;
var
f:textfile;
x,y:integer;
begin
assignfile (f,’Filename’);
rewrite;
writeln (f,stringgrid.colcount);
writeln (f,stringgrid.rowcount);
For X:=0 to stringgrid.colcount-1 do
For y:=0 to stringgrid.rowcount-1 do
writeln (F, stringgrid.cells[x,y]);
closefile;
end;

Procedure LoadGrid;
var
f:textfile;
temp,x,y:integer;
tempstr:string;
begin
assignfile (f,’Filename’);
reset;
readln (f,temp);
stringgrid.colcount:=temp;
readln (f,temp);
stringgrid.rowcount:=temp;
For X:=0 to stringgrid.colcount-1 do
For y:=0 to stringgrid.rowcount-1 do begin
readln (F, tempstr);
stringgrid.cells[x,y]:=tempstr;
end;
closefile;

Avi dosyasının görünüm alanını seçilen panele eşitleme

begin
with MediaPlayer1 do begin
DeviceType := dtAutoSelect;
visible := false;
FileName := InputBox(’AVI’, ’Enter AVI file name’, ’c:\windows\borland.avi’);
display := panel1;
open;
DisplayRect := rect(0, 0, panel1.width, panel1.height); {This is it!}
rewind;
play;
end;
end;
Windows’a çizgi çizmenin farklı bir yolu

procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
var dc:hdc;
begin
dc:=getdc(0);
Windows.LineTo(dc,x,y);
end;

end.
Memo componentindeki cursorun pozisyonunu bulma

procedure TForm1.Button1Click(Sender: TObject);
var
Row, Col: Integer;
begin
Row := SendMessage(Memo1.Handle, EM_LINEFROMCHAR, Memo1.SelStart, 0);
Col := Memo1.SelStart - SendMessage(Memo1.Handle, EM_LINEINDEX, Row, 0);
Label1.caption := ’Row= ’ + IntToStr(Row+1) + ’ Col= ’ + IntToStr(Col+1);
end;
Form üstüne dbclick yapılınca maximisize (tam ekran) olması

type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
procedure WMNCHitTest(var M: TWMNCHitTest); message wm_NCHitTest;
end;

var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.WMNCHitTest(var M: TWMNCHitTest);
begin
inherited;
if M.Result = htClient then
M.Result := htCaption;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
Close;
end;
end.
Control paneldeki bölümleri açma (cpl dosyalarını açma)

unit open_cpl;

interface

function RunControlPanelApplet( sAppletFileName : string) : integer;

implementation

uses Windows;

function RunControlPanelApplet( sAppletFileName : string) : integer;
begin
Result := WinExec( PChar(’rundll32.exe shell32.dll,’+ ’Control_RunDLL ’+sAppletFileName), SW_SHOWNORMAL);
end;

end.


access.cpl: Accessibility Properties
appwiz.cpl: Add/Remove Programs Properties
desk.cpl: Display Properties
intl.cpl: Regional Settings Properties
joy.cpl: Joystick Properties
main.cpl: Mouse Properties
mmsys.cpl: Multimedia Properties
modem.cpl: Modems Properties
sysdm.cpl: System Properties
timedate.cpl: Time/Date Properties
Kullanılan printer adı

uses Printers;
function GetDefaultPrinterName : string;
begin GetDefaultPrinterName := Printer.Printers[ Printer.PrinterIndex ];
end;