Delphi Kod Örnekleri-Büyük Arşiv

KODLAR
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 Adi degistirme

SysUtils unitesinin içindeki RenameFile function bu isi görmektedir.

Treeview componentinin durumunu kaydetme ve gösterme

Kaydetmek için

TreeView.SaveToFile('Dosya.adi');

Dosyayi açmak için

TreeView.LoadFromFile('Dosya.adi');

Dosyayi yanlizca okumak (read only) seklinde açma

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

Açilan dosyanin tarih ve zamanini ayarlamak


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

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

ComboBox'in asagiya listelemesinin farkli bir yolu (DropComboBox)

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

Basligi 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) kullanimi

Önce uses bölümüne chart ekleyin.
Formun üstüne bir tane image componenti yerlestirin ve formun create olayina asagidaki kodu yazin.

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

Küçük bir kolaylik ctrl-space

Delphide esitlik kurucaginiz zaman ctrl-space'e bastiginizda verebileceginiz degerleri göstermektedir.
Label1.caption:= (burada ctrl-space bastiginizda verebileceginiz degerleri görürsünüz)


Dbf dosyasini pack etmek (silinen dosyalari 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 olmadigini anlamak
HKEY_LOCAL_MACHINE\Software\Borland\Database Engine bölümü bde'ye ayrilmistir ve yüklü olup olmadigini asagidaki degerleri kontrol ederek bulabilirsiniz.

DLLPATH
CONFIGFILE01