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uses
ShellApi;
// strFolder is the folder you want to open
procedure ShowFolder(strFolder: string);
begin
ShellExecute(Application.Handle,
PChar('explore'),
PChar(strFolder),
nil,
nil,
SW_SHOWNORMAL);
end;
procedure TForm1.Button1Click(Sender: TObject);
const
strFolder = 'c:\My Documents';
begin
ShowFolder(strFolder);
end;Kod: Tümünü seç
{ Open a file or starts a programm (without parameters) }
procedure OpenFile(FileName: string);
var
c: array[0..800] of Char;
begin
StrPCopy(c, FileName);
ShellExecute(Application.Handle, 'open', c, nil, nil, SW_NORMAL);
end;
{ Starts a programm with commandline parameters }
procedure OpenProgram(prog, params: string);
var
c, p: array[0..800] of Char;
begin
StrPCopy(c, prog);
StrPCopy(p, params);
ShellExecute(Application.Handle, 'open', c, p, nil, SW_NORMAL);
end;
{ Starts a program and wait until its terminated:
WindowState is of the SW_xxx constants }
function ExecAndWait(const FileName, Params: string;
WindowState: Word): Boolean;
var
SUInfo: TStartupInfo;
ProcInfo: TProcessInformation;
CmdLine: string;
begin
{ Enclose filename in quotes to take care of
long filenames with spaces. }
CmdLine := '"' + FileName + '"' + Params;
FillChar(SUInfo, SizeOf(SUInfo), #0);
with SUInfo do
begin
cb := SizeOf(SUInfo);
dwFlags := STARTF_USESHOWWINDOW;
wShowWindow := WindowState;
end;
Result := CreateProcess(nil, PChar(CmdLine), nil, nil, False,
CREATE_NEW_CONSOLE or
NORMAL_PRIORITY_CLASS, nil,
PChar(ExtractFilePath(FileName)),
SUInfo, ProcInfo);
{ Wait for it to finish. }
if Result then
WaitForSingleObject(ProcInfo.hProcess, INFINITE);
end;
{ Execute a complete shell command line and waits until terminated. }
function ExecCmdLineAndWait(const CmdLine: string;
WindowState: Word): Boolean;
var
SUInfo: TStartupInfo;
ProcInfo: TProcessInformation;
begin
{ Enclose filename in quotes to take care of
long filenames with spaces. }
FillChar(SUInfo, SizeOf(SUInfo), #0);
with SUInfo do
begin
cb := SizeOf(SUInfo);
dwFlags := STARTF_USESHOWWINDOW;
wShowWindow := WindowState;
end;
Result := CreateProcess(nil, PChar(CmdLine), nil, nil, False,
CREATE_NEW_CONSOLE or
NORMAL_PRIORITY_CLASS, nil,
nil {PChar(ExtractFilePath(Filename))},
SUInfo, ProcInfo);
{ Wait for it to finish. }
if Result then
WaitForSingleObject(ProcInfo.hProcess, INFINITE);
end;
{ Execute a complete shell command line without waiting. }
function OpenCmdLine(const CmdLine: string;
WindowState: Word): Boolean;
var
SUInfo: TStartupInfo;
ProcInfo: TProcessInformation;
begin
{ Enclose filename in quotes to take care of
long filenames with spaces. }
FillChar(SUInfo, SizeOf(SUInfo), #0);
with SUInfo do
begin
cb := SizeOf(SUInfo);
dwFlags := STARTF_USESHOWWINDOW;
wShowWindow := WindowState;
end;
Result := CreateProcess(nil, PChar(CmdLine), nil, nil, False,
CREATE_NEW_CONSOLE or
NORMAL_PRIORITY_CLASS, nil,
nil {PChar(ExtractFilePath(Filename))},
SUInfo, ProcInfo);
end;
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type
TPerson = record
Name: string[50];
vorname: string[50];
end;
TComputer = record
Name: string[30];
cpu: string[30];
end;
var
Form1: TForm1;
Person: TPerson;
Computer: TComputer;
Stream: TFileStream;
implementation
{$R *.DFM}
//Speichern resp. Erstellen von Datei
//Save or create the file
procedure TForm1.Button1Click(Sender: TObject);
begin
try
Stream := TFileStream.Create('c:\test.dat', fmOpenReadWrite);
except
Stream := TFileStream.Create('c:\test.dat', fmCreate);
end;
//2 Einträge pro Record
//save 2 records for TPerson and TComputer
Person.Name := 'Grossenbacher';
Person.vorname := 'Simon';
Stream.WriteBuffer(Person, SizeOf(TPerson));
Person.Name := 'Stutz';
Person.vorname := 'Thomas';
Stream.WriteBuffer(Person, SizeOf(TPerson));
Computer.Name := 'Delphi';
Computer.cpu := 'Intel';
Stream.WriteBuffer(Computer, SizeOf(TComputer));
Computer.Name := 'Win';
Computer.cpu := 'AMD';
Stream.WriteBuffer(Computer, SizeOf(TComputer));
Stream.Free;
end;
//lädt alle daten von TPerson in listbox1 und
//daten von TComputer in Listbox2
//load records from TPerson to listbox1 and
//load records from TComputer to listbox2
procedure TForm1.Button2Click(Sender: TObject);
var
i: Integer;
begin
try
// nur lesen öffnen
//open read only
Stream := TFileStream.Create('c:\test.dat', fmOpenRead);
except
ShowMessage('Datei konnte nicht geladen werden.');
Exit;
end;
//variable i auf anzahl Einträge setzen
//set variable i to the record count
//Einlesen von TPerson
//Read records TPerson
for i := 2 downto 1 do
begin
Stream.ReadBuffer(Person, SizeOf(TPerson));
Listbox1.Items.Add(Person.vorname + ' ' + Person.Name);
end;
//Einlesen von TComputer
//Read Records TComputer
for i := 2 downto 1 do
begin
Stream.ReadBuffer(Computer, SizeOf(TComputer));
Listbox2.Items.Add(Computer.Name + ' ' + Computer.cpu);
end;
Stream.Free;
end;
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ExpandUNCFileName returns the full path of the FileName
with the network drive portion in UNC format.
The pathname in the UNC-Format has the format:
\\Servername\sharename
ExpandUNCFileName gibt einen String mit dem vollständigen
Pfadnamen der in FileName übergebenen Datei zurück.
Ein vollständig qualifizierter Pfadname besteht aus der
Laufwerkskomponente des Dateinamens im UNC-Format:
\\Servername\sharename
// Example, Beispiel:
Label1.Caption := ExpandUNCFileName('K:\sharename.tmp'));
{where "K" is a Network Drive.}
{*****************************************************}
{2. Way }
function GetUNCName(const LocalPath: string): string;
var
BufferSize: DWord;
DummyBuffer: Byte;
Buffer: Pointer;
Error: DWord;
begin
BufferSize := 1;
WNetGetUniversalName(PChar(LocalPath), UNIVERSAL_NAME_INFO_LEVEL, @DummyBuffer, BufferSize);
Buffer := AllocMem(BufferSize);
try
Error := WNetGetUniversalName(PChar(LocalPath), UNIVERSAL_NAME_INFO_LEVEL, Buffer, BufferSize);
if Error <> NO_ERROR then
begin
SetLastError(Error);
RaiseLastWin32Error;
end;
Result := PUniversalNameInfo(Buffer)^.lpUniversalName
finally
FreeMem(Buffer);
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
Label1.Caption := GetUNCName('y:\xyz\')
end;
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function SystemErrorMessage: string;
var
P: PChar;
begin
if FormatMessage(Format_Message_Allocate_Buffer + Format_Message_From_System,
nil,
GetLastError,
0,
@P,
0,
nil) <> 0 then
begin
Result := P;
LocalFree(Integer(P))
end
else
Result := '';
end;
// Path to Original File
procedure TForm1.Button2Click(Sender: TObject);
begin
if Opendialog1.Execute then
edit1.Text := OpenDialog1.FileName;
end;
// Path to New File
procedure TForm1.Button3Click(Sender: TObject);
begin
if Opendialog2.Execute then
edit2.Text := OpenDialog2.FileName;
end;
// Replace the File.
procedure TForm1.Button1Click(Sender: TObject);
begin
if (Movefileex(PChar(Edit1.Text), PChar(Edit2.Text), MOVEFILE_DELAY_UNTIL_REBOOT) = False) then
ShowMessage(SystemErrorMessage)
else
begin
ShowMessage('Please Restart Windows to have these changes take effect');
halt;
end;
end;
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Directories
Create a Directory :
* CreateDir('c:\path');
* Tip 102 (MkDir Example)
Remove a Directory : RemoveDir('c:\path') or RmDir('c:\path')
Change a Directory : ChDir('c:\path')
Current Directory : GetCurrentDir
Check if a Directory exists : if DirectoryExists('c:\path') then ...
Rename a Directory: Tip 1024 (SHFileOperation)
Copy/Move/Delete whole directories: Tip 152 (ShFileOperation)
Files
Rename a File : RenameFile('file1.txt', 'file2.xyz')
Delete a File : DeleteFile('c:\text.txt')
Move a File : MoveFile('C:\file1.txt','D:\file1.txt');
Copy a File :
* CopyFile(Pchar(File1),PChar(File2),bFailIfExists)
* Tip 101 (Example)
* Tip 28 (SHFileOperation)
Change a File's Extension : ChangeFileExt('test.txt', 'xls')
Check if a File exists : if FileExists('c:\filename.tst') then ...
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// When you create a file or directory, you become the owner of it.
// With GetFileOwner you get the owner of a file.
function GetFileOwner(FileName: string;
var Domain, Username: string): Boolean;
var
SecDescr: PSecurityDescriptor;
SizeNeeded, SizeNeeded2: DWORD;
OwnerSID: PSID;
OwnerDefault: BOOL;
OwnerName, DomainName: PChar;
OwnerType: SID_NAME_USE;
begin
GetFileOwner := False;
GetMem(SecDescr, 1024);
GetMem(OwnerSID, SizeOf(PSID));
GetMem(OwnerName, 1024);
GetMem(DomainName, 1024);
try
if not GetFileSecurity(PChar(FileName),
OWNER_SECURITY_INFORMATION,
SecDescr, 1024, SizeNeeded) then
Exit;
if not GetSecurityDescriptorOwner(SecDescr,
OwnerSID, OwnerDefault) then
Exit;
SizeNeeded := 1024;
SizeNeeded2 := 1024;
if not LookupAccountSID(nil, OwnerSID, OwnerName,
SizeNeeded, DomainName, SizeNeeded2, OwnerType) then
Exit;
Domain := DomainName;
Username := OwnerName;
finally
FreeMem(SecDescr);
FreeMem(OwnerName);
FreeMem(DomainName);
end;
GetFileOwner := True;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
Domain, Username: string;
begin
GetFileOwner('YourFile.xyz', domain, username);
ShowMessage(username + '@' + domain);
end;
// Note: Only works unter NT.
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uses
Registry;
procedure SetAutoStart(AppName, AppTitle: string; bRegister: Boolean);
const
RegKey = '\Software\Microsoft\Windows\CurrentVersion\Run';
// or: RegKey = '\Software\Microsoft\Windows\CurrentVersion\RunOnce';
var
Registry: TRegistry;
begin
Registry := TRegistry.Create;
try
Registry.RootKey := HKEY_LOCAL_MACHINE;
if Registry.OpenKey(RegKey, False) then
begin
if bRegister = False then
Registry.DeleteValue(AppTitle)
else
Registry.WriteString(AppTitle, AppName);
end;
finally
Registry.Free;
end;
end;
// Example:
procedure TForm1.Button1Click(Sender: TObject);
begin
// 1.Parameter: Path to your Exe-File
// 2. Parameter: the Title of your Application
// 3. Set (true) or Unset (false) Autorun
SetAutoStart(ParamStr(0), 'Title of your Application', True);
end;
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{
To set a file's attributes, pass the name of the file and
the attributes you want to the FileSetAttr function.
}
{
FileSetAttr setzt die Attribute der mit FileName
angegebenen Datei auf den Wert Attr.
}
{
To hide a file:
Eine Datei verstecken:
}
procedure TForm1.Button1Click(Sender: TObject);
begin
FileSetAttr('C:\YourFile.ext', faHidden);
end;
{
Other Files Attributes:
Andere Dateiattribute:
}
{
faReadOnly $00000001 Schreibgeschützte Datei
faHidden $00000002 Verborgene Datei
faSysFile $00000004 Systemdatei
faVolumeID $00000008 Laufwerks-ID
faDirectory $00000010 Verzeichnis
faArchive $00000020 Archivdatei
faAnyFile $0000003F Beliebige Datei
}
{
You can also set some attributes at once:
Es können auch mehrere Attribute aufs Mal gesetzt werden:
}
FileSetAttr('C:\Autoexec.bat', faReadOnly + faHidden);
{
To remove write protection on a file:
Den Schreibschutz einer Datei aufheben:
}
if (FileGetAttr(FileName) and faReadOnly) > 0
then FileSetAttr(FileName, FileGetAttr(FileName) xor faReadOnly);
{
Re-Set write protection:
Schreibschutz wieder setzen:
}
FileSetAttr(FileName, FileGetAttr(FileName) or faReadOnly);
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function GetCheckSum(FileName: string): DWORD;
var
F: file of DWORD;
P: Pointer;
Fsize: DWORD;
Buffer: array [0..500] of DWORD;
begin
FileMode := 0;
AssignFile(F, FileName);
Reset(F);
Seek(F, FileSize(F) div 2);
Fsize := FileSize(F) - 1 - FilePos(F);
if Fsize > 500 then Fsize := 500;
BlockRead(F, Buffer, Fsize);
Close(F);
P := @Buffer;
asm
xor eax, eax
xor ecx, ecx
mov edi , p
@again:
add eax, [edi + 4*ecx]
inc ecx
cmp ecx, fsize
jl @again
mov @result, eax
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage(IntToStr(GetCheckSum('c:\Autoexec.bat')));
end;
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uses
Registry,
ActiveX,
ComObj,
ShlObj;
type
ShortcutType = (_DESKTOP, _QUICKLAUNCH, _SENDTO, _STARTMENU, _OTHERFOLDER);
function CreateShortcut(SourceFileName: string; // the file the shortcut points to
Location: ShortcutType; // shortcut location
SubFolder, // subfolder of location
WorkingDir, // working directory property of the shortcut
Parameters,
Description: string): // description property of the shortcut
string;
const
SHELL_FOLDERS_ROOT = 'Software\MicroSoft\Windows\CurrentVersion\Explorer';
QUICK_LAUNCH_ROOT = 'Software\MicroSoft\Windows\CurrentVersion\GrpConv';
var
MyObject: IUnknown;
MySLink: IShellLink;
MyPFile: IPersistFile;
Directory, LinkName: string;
WFileName: WideString;
Reg: TRegIniFile;
begin
MyObject := CreateComObject(CLSID_ShellLink);
MySLink := MyObject as IShellLink;
MyPFile := MyObject as IPersistFile;
MySLink.SetPath(PChar(SourceFileName));
MySLink.SetArguments(PChar(Parameters));
MySLink.SetDescription(PChar(Description));
LinkName := ChangeFileExt(SourceFileName, '.lnk');
LinkName := ExtractFileName(LinkName);
// Quicklauch
if Location = _QUICKLAUNCH then
begin
Reg := TRegIniFile.Create(QUICK_LAUNCH_ROOT);
try
Directory := Reg.ReadString('MapGroups', 'Quick Launch', '');
finally
Reg.Free;
end;
end
else
// Other locations
begin
Reg := TRegIniFile.Create(SHELL_FOLDERS_ROOT);
try
case Location of
_OTHERFOLDER : Directory := SubFolder;
_DESKTOP : Directory := Reg.ReadString('Shell Folders', 'Desktop', '');
_STARTMENU : Directory := Reg.ReadString('Shell Folders', 'Start Menu', '');
_SENDTO : Directory := Reg.ReadString('Shell Folders', 'SendTo', '');
end;
finally
Reg.Free;
end;
end;
if Directory <> '' then
begin
if (SubFolder <> '') and (Location <> _OTHERFOLDER) then
WFileName := Directory + '\' + SubFolder + '\' + LinkName
else
WFileName := Directory + '\' + LinkName;
if WorkingDir = '' then
MySLink.SetWorkingDirectory(PChar(ExtractFilePath(SourceFileName)))
else
MySLink.SetWorkingDirectory(PChar(WorkingDir));
MyPFile.Save(PWChar(WFileName), False);
Result := WFileName;
end;
end;
function GetProgramDir: string;
var
reg: TRegistry;
begin
reg := TRegistry.Create;
try
reg.RootKey := HKEY_CURRENT_USER;
reg.OpenKey('Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders', False);
Result := reg.ReadString('Programs');
reg.CloseKey;
finally
reg.Free;
end;
end;
// Some examples:
procedure TForm1.Button1Click(Sender: TObject);
const
PROGR = 'c:\YourProgram.exe';
var
resPath: string;
begin
//Create a Shortcut in the Quckick launch toolbar
CreateShortcut(PROGR, _QUICKLAUNCH, '','','','Description');
//Create a Shortcut on the Desktop
CreateShortcut(PROGR, _DESKTOP, '','','','Description');
//Create a Shortcut in the Startmenu /"Programs"-Folder
resPath := CreateShortcut(PROGR, _OTHERFOLDER, GetProgramDir,'','','Description');
if resPath <> '' then
begin
ShowMessage('Shortcut Successfully created in: ' + resPath);
end;
end;
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function GetTextFromFile(AFile: string; var Returnstring: string): Boolean;
var
FileStream: TFileStream;
begin
Result := False;
if not FileExists(AFile) then Exit;
FileStream := TFileStream.Create(AFile, fmOpenRead);
try
if FileStream.Size <> 0 then
begin
SetLength(Returnstring, FileStream.Size);
FileStream.Read(Returnstring[1], FileStream.Size);
Result := True;
end;
finally
FileStream.Free;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
s: string;
begin
if GetTextFromFile('c:\autoexec.bat', s) then
begin
ShowMessage(s);
// Label1.caption := s; or assign the text to a Label
// Memo1.text := s; or a memo
end;
end;Kod: Tümünü seç
{1.}
function Are2FilesEqual(const File1, File2: TFileName): Boolean;
var
ms1, ms2: TMemoryStream;
begin
Result := False;
ms1 := TMemoryStream.Create;
try
ms1.LoadFromFile(File1);
ms2 := TMemoryStream.Create;
try
ms2.LoadFromFile(File2);
if ms1.Size = ms2.Size then
Result := CompareMem(ms1.Memory, ms2.memory, ms1.Size);
finally
ms2.Free;
end;
finally
ms1.Free;
end
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
if Opendialog1.Execute then
if Opendialog2.Execute then
if Are2FilesEqual(Opendialog1.FileName, Opendialog2.FileName) then
ShowMessage('Files are equal.');
end;
{********************************************}
{2.}
function FilesAreEqual(const File1, File2: TFileName): Boolean;
const
BlockSize = 65536;
var
fs1, fs2: TFileStream;
L1, L2: Integer;
B1, B2: array[1..BlockSize] of Byte;
begin
Result := False;
fs1 := TFileStream.Create(File1, fmOpenRead or fmShareDenyWrite);
try
fs2 := TFileStream.Create(File2, fmOpenRead or fmShareDenyWrite);
try
if fs1.Size = fs2.Size then
begin
while fs1.Position < fs1.Size do
begin
L1 := fs1.Read(B1[1], BlockSize);
L2 := fs2.Read(B2[1], BlockSize);
if L1 <> L2 then
begin
Exit;
end;
if not CompareMem(@B1[1], @B2[1], L1) then Exit;
end;
Result := True;
end;
finally
fs2.Free;
end;
finally
fs1.Free;
end;
end;
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// The constants here are for the CRC-32 generator
// polynomial, as defined in the Microsoft
// Systems Journal, March 1995, pp. 107-108
const
Table: array[0..255] of DWORD =
($00000000, $77073096, $EE0E612C, $990951BA,
$076DC419, $706AF48F, $E963A535, $9E6495A3,
$0EDB8832, $79DCB8A4, $E0D5E91E, $97D2D988,
$09B64C2B, $7EB17CBD, $E7B82D07, $90BF1D91,
$1DB71064, $6AB020F2, $F3B97148, $84BE41DE,
$1ADAD47D, $6DDDE4EB, $F4D4B551, $83D385C7,
$136C9856, $646BA8C0, $FD62F97A, $8A65C9EC,
$14015C4F, $63066CD9, $FA0F3D63, $8D080DF5,
$3B6E20C8, $4C69105E, $D56041E4, $A2677172,
$3C03E4D1, $4B04D447, $D20D85FD, $A50AB56B,
$35B5A8FA, $42B2986C, $DBBBC9D6, $ACBCF940,
$32D86CE3, $45DF5C75, $DCD60DCF, $ABD13D59,
$26D930AC, $51DE003A, $C8D75180, $BFD06116,
$21B4F4B5, $56B3C423, $CFBA9599, $B8BDA50F,
$2802B89E, $5F058808, $C60CD9B2, $B10BE924,
$2F6F7C87, $58684C11, $C1611DAB, $B6662D3D,
$76DC4190, $01DB7106, $98D220BC, $EFD5102A,
$71B18589, $06B6B51F, $9FBFE4A5, $E8B8D433,
$7807C9A2, $0F00F934, $9609A88E, $E10E9818,
$7F6A0DBB, $086D3D2D, $91646C97, $E6635C01,
$6B6B51F4, $1C6C6162, $856530D8, $F262004E,
$6C0695ED, $1B01A57B, $8208F4C1, $F50FC457,
$65B0D9C6, $12B7E950, $8BBEB8EA, $FCB9887C,
$62DD1DDF, $15DA2D49, $8CD37CF3, $FBD44C65,
$4DB26158, $3AB551CE, $A3BC0074, $D4BB30E2,
$4ADFA541, $3DD895D7, $A4D1C46D, $D3D6F4FB,
$4369E96A, $346ED9FC, $AD678846, $DA60B8D0,
$44042D73, $33031DE5, $AA0A4C5F, $DD0D7CC9,
$5005713C, $270241AA, $BE0B1010, $C90C2086,
$5768B525, $206F85B3, $B966D409, $CE61E49F,
$5EDEF90E, $29D9C998, $B0D09822, $C7D7A8B4,
$59B33D17, $2EB40D81, $B7BD5C3B, $C0BA6CAD,
$EDB88320, $9ABFB3B6, $03B6E20C, $74B1D29A,
$EAD54739, $9DD277AF, $04DB2615, $73DC1683,
$E3630B12, $94643B84, $0D6D6A3E, $7A6A5AA8,
$E40ECF0B, $9309FF9D, $0A00AE27, $7D079EB1,
$F00F9344, $8708A3D2, $1E01F268, $6906C2FE,
$F762575D, $806567CB, $196C3671, $6E6B06E7,
$FED41B76, $89D32BE0, $10DA7A5A, $67DD4ACC,
$F9B9DF6F, $8EBEEFF9, $17B7BE43, $60B08ED5,
$D6D6A3E8, $A1D1937E, $38D8C2C4, $4FDFF252,
$D1BB67F1, $A6BC5767, $3FB506DD, $48B2364B,
$D80D2BDA, $AF0A1B4C, $36034AF6, $41047A60,
$DF60EFC3, $A867DF55, $316E8EEF, $4669BE79,
$CB61B38C, $BC66831A, $256FD2A0, $5268E236,
$CC0C7795, $BB0B4703, $220216B9, $5505262F,
$C5BA3BBE, $B2BD0B28, $2BB45A92, $5CB36A04,
$C2D7FFA7, $B5D0CF31, $2CD99E8B, $5BDEAE1D,
$9B64C2B0, $EC63F226, $756AA39C, $026D930A,
$9C0906A9, $EB0E363F, $72076785, $05005713,
$95BF4A82, $E2B87A14, $7BB12BAE, $0CB61B38,
$92D28E9B, $E5D5BE0D, $7CDCEFB7, $0BDBDF21,
$86D3D2D4, $F1D4E242, $68DDB3F8, $1FDA836E,
$81BE16CD, $F6B9265B, $6FB077E1, $18B74777,
$88085AE6, $FF0F6A70, $66063BCA, $11010B5C,
$8F659EFF, $F862AE69, $616BFFD3, $166CCF45,
$A00AE278, $D70DD2EE, $4E048354, $3903B3C2,
$A7672661, $D06016F7, $4969474D, $3E6E77DB,
$AED16A4A, $D9D65ADC, $40DF0B66, $37D83BF0,
$A9BCAE53, $DEBB9EC5, $47B2CF7F, $30B5FFE9,
$BDBDF21C, $CABAC28A, $53B39330, $24B4A3A6,
$BAD03605, $CDD70693, $54DE5729, $23D967BF,
$B3667A2E, $C4614AB8, $5D681B02, $2A6F2B94,
$B40BBE37, $C30C8EA1, $5A05DF1B, $2D02EF8D);
type
//----------------------------------crc32----------------------------------
{$IFDEF VER130} // This is a bit awkward
// 8-byte integer
TInteger8 = Int64; // Delphi 5
{$ELSE}
{$IFDEF VER120}
TInteger8 = Int64; // Delphi 4
{$ELSE}
TInteger8 = COMP; // Delphi 2 or 3
{$ENDIF}
{$ENDIF}
//----------------------------------crc32----------------------------------
// Use CalcCRC32 as a procedure so CRCValue can be passed in but
// also returned. This allows multiple calls to CalcCRC32 for
// the "same" CRC-32 calculation.
procedure CalcCRC32(p: Pointer; ByteCount: DWORD; var CRCValue: DWORD);
// The following is a little cryptic (but executes very quickly).
// The algorithm is as follows:
// 1. exclusive-or the input byte with the low-order byte of
// the CRC register to get an INDEX
// 2. shift the CRC register eight bits to the right
// 3. exclusive-or the CRC register with the contents of Table[INDEX]
// 4. repeat steps 1 through 3 for all bytes
var
i: DWORD;
q: ^BYTE;
begin
q := p;
for i := 0 to ByteCount - 1 do
begin
CRCvalue := (CRCvalue shr 8) xor
Table[q^ xor (CRCvalue and $000000FF)];
Inc(q)
end
end {CalcCRC32};
function CalcStringCRC32(s: string; out CRC32: DWORD): Boolean;
var
CRC32Table: DWORD;
begin
// Verify the table used to compute the CRCs has not been modified.
// Thanks to Gary Williams for this suggestion, Jan. 2003.
CRC32Table := $FFFFFFFF;
CalcCRC32(Addr(Table[0]), SizeOf(Table), CRC32Table);
CRC32Table := not CRC32Table;
if CRC32Table <> $6FCF9E13 then ShowMessage('CRC32 Table CRC32 is ' +
IntToHex(Crc32Table, 8) +
', expecting $6FCF9E13')
else
begin
CRC32 := $FFFFFFFF; // To match PKZIP
if Length(s) > 0 // Avoid access violation in D4
then CalcCRC32(Addr(s[1]), Length(s), CRC32);
CRC32 := not CRC32; // To match PKZIP
end;
end;
procedure CalcFileCRC32(FromName: string; var CRCvalue: DWORD;
var TotalBytes: TInteger8;
var error: Word);
var
Stream: TMemoryStream;
begin
error := 0;
CRCValue := $FFFFFFFF;
Stream := TMemoryStream.Create;
try
try
Stream.LoadFromFile(FromName);
if Stream.Size > 0 then CalcCRC32(Stream.Memory, Stream.Size, CRCvalue)
except
on E: EReadError do
error := 1
end;
CRCvalue := not CRCvalue
finally
Stream.Free
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
s: string;
CRC32: DWORD;
begin
s := 'Test String';
if CalcStringCRC32(s, CRC32) then
ShowMessage(IntToStr(crc32));
end;