Windows Programming Tips/fr

program listdevices;

{$ifdef fpc}{$mode delphi}{$endif}
{$apptype console}

uses
  Windows;

var
  Drive: Char;
  DriveLetter: string;
  OldMode: Word; 
begin
  WriteLn('The following drives were found in this computer:');
  WriteLn('');

  // Empty Floppy or Zip drives can generate a Windows error.
  // We disable system errors during the listing.
  // Note that another way to skip these errors would be to use DEVICE_IO_CONTROL.
  OldMode := SetErrorMode(SEM_FAILCRITICALERRORS);
  try 

    // Search all drive letters
    for Drive := 'A' to 'Z' do
    begin
      DriveLetter := Drive + ':\';
   
      case GetDriveType(PChar(DriveLetter)) of
       DRIVE_REMOVABLE: WriteLn(DriveLetter + ' Floppy Drive');
       DRIVE_FIXED:     WriteLn(DriveLetter + ' Fixed Drive');
       DRIVE_REMOTE:    WriteLn(DriveLetter + ' Network Drive');
       DRIVE_CDROM:     WriteLn(DriveLetter + ' CD-ROM Drive');
       DRIVE_RAMDISK:   WriteLn(DriveLetter + ' RAM Disk');
      end;
    end;

  finally
    // Restores previous Windows error mode.
    SetErrorMode(OldMode); 
  end;

  // Also add a stop to see the result under Windows
  WriteLn('');
  WriteLn('Please press <ENTER> to exit the program.');
  ReadLn(DriveLetter);
end.

uses
...
windows, shlobj {for special folders}, ActiveX, ComObj;
...
procedure CreateDesktopShortCut(Target, TargetArguments, ShortcutName: string);
var
  IObject: IUnknown;
  ISLink: IShellLink;
  IPFile: IPersistFile;
  PIDL: PItemIDList;
  InFolder: array[0..MAX_PATH] of Char;
  TargetName: String;
  LinkName: WideString;
begin
  { Creates an instance of IShellLink }
  IObject := CreateComObject(CLSID_ShellLink);
  ISLink := IObject as IShellLink;
  IPFile := IObject as IPersistFile;

  ISLink.SetPath(pChar(Target));
  ISLink.SetArguments(pChar(TargetArguments));
  ISLink.SetWorkingDirectory(pChar(ExtractFilePath(Target)));

  { Get the desktop location }
  SHGetSpecialFolderLocation(0, CSIDL_DESKTOPDIRECTORY, PIDL);
  SHGetPathFromIDList(PIDL, InFolder);
  LinkName := InFolder + PathDelim + ShortcutName+'.lnk';

  { Create the link }
  IPFile.Save(PWChar(LinkName), false);
end;

uses 
...
shlobj;

var
  AppDataPath: Array[0..MaxPathLen] of Char; //Allocate memory
...
begin
...
    AppDataPath:='';
    SHGetSpecialFolderPath(0,AppDataPath,CSIDL_LOCAL_APPDATA,false);
    writeln('Your local appdata path is: ' + AppDataPath);

program UseEnv;

uses sysutils;

begin
  writeln(GetEnvironmentVariable('APPDATA'));
  writeln(GetEnvironmentVariable('PROGRAMFILES'));
  writeln(GetEnvironmentVariable('HOMEPATH'));
  readln;
end.

program ListEnv;

uses sysutils;

var
  i: integer;

begin
  for i in [0..GetEnvironmentVariableCount-1] do
    writeln(GetEnvironmentString(i));
  readln;
end.

unit controlwindevice;

{ Enable Disable windows devices

  Copyright (c) 2010-2012 Ludo Brands

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to
  deal in the Software without restriction, including without limitation the
  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  sell copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  IN THE SOFTWARE.
}

{$mode delphi}{$H+}

interface

uses
  Classes, SysUtils,dynlibs,windows;

const
  GUID_DEVCLASS_NET : TGUID = '{4D36E972-E325-11CE-BFC1-08002BE10318}';
  GUID_DEVCLASS_PORT : TGUID = '{4D36E978-E325-11CE-BFC1-08002BE10318}';

type
  TDeviceControlResult=(DCROK,DCRErrEnumDeviceInfo,DCRErrSetClassInstallParams,
    DCRErrDIF_PROPERTYCHANGE);

function LoadDevices(GUID_DevClass:TGUID):TStringList;
function EnableDevice(SelectedItem: DWord):TDeviceControlResult;
function DisableDevice(SelectedItem: DWord):TDeviceControlResult;

implementation

// Setup api, based on SetupApi.pas JEDI library
const
    DIF_PROPERTYCHANGE  = $00000012;
    DICS_ENABLE         = $00000001;
    DICS_DISABLE        = $00000002;
    DICS_FLAG_GLOBAL    = $00000001;  // make change in all hardware profiles
    DIGCF_PRESENT       = $00000002;
    SPDRP_DEVICEDESC    = $00000000; // DeviceDesc (R/W)
    SPDRP_CLASS         = $00000007; // Class (R--tied to ClassGUID)
    SPDRP_CLASSGUID     = $00000008; // ClassGUID (R/W)
    SPDRP_FRIENDLYNAME  = $0000000C; // FriendlyName (R/W)

type
  HDEVINFO = Pointer;
  DI_FUNCTION = LongWord;    // Function type for device installer

  PSPClassInstallHeader = ^TSPClassInstallHeader;
  SP_CLASSINSTALL_HEADER = packed record
    cbSize: DWORD;
    InstallFunction: DI_FUNCTION;
  end;
  TSPClassInstallHeader = SP_CLASSINSTALL_HEADER;

  PSPPropChangeParams = ^TSPPropChangeParams;
  SP_PROPCHANGE_PARAMS = packed record
    ClassInstallHeader: TSPClassInstallHeader;
    StateChange: DWORD;
    Scope: DWORD;
    HwProfile: DWORD;
  end;
  TSPPropChangeParams = SP_PROPCHANGE_PARAMS;

  PSPDevInfoData = ^TSPDevInfoData;
  SP_DEVINFO_DATA = packed record
    cbSize: DWORD;
    ClassGuid: TGUID;
    DevInst: DWORD; // DEVINST handle
    Reserved: ULONG_PTR;
  end;
  TSPDevInfoData = SP_DEVINFO_DATA;

  TSetupDiEnumDeviceInfo = function(DeviceInfoSet: HDEVINFO;
    MemberIndex: DWORD; var DeviceInfoData: TSPDevInfoData): LongBool; stdcall;
  TSetupDiSetClassInstallParamsA = function(DeviceInfoSet: HDEVINFO;
    DeviceInfoData: PSPDevInfoData; ClassInstallParams: PSPClassInstallHeader;
    ClassInstallParamsSize: DWORD): LongBool; stdcall;
  TSetupDiSetClassInstallParamsW = function(DeviceInfoSet: HDEVINFO;
    DeviceInfoData: PSPDevInfoData; ClassInstallParams: PSPClassInstallHeader;
    ClassInstallParamsSize: DWORD): LongBool; stdcall;
  TSetupDiSetClassInstallParams = TSetupDiSetClassInstallParamsA;
  TSetupDiCallClassInstaller = function(InstallFunction: DI_FUNCTION;
    DeviceInfoSet: HDEVINFO; DeviceInfoData: PSPDevInfoData): LongBool; stdcall;
  TSetupDiGetClassDevs = function(ClassGuid: PGUID; const Enumerator: PAnsiChar;
    hwndParent: HWND; Flags: DWORD): HDEVINFO; stdcall;
  TSetupDiGetDeviceRegistryPropertyA = function(DeviceInfoSet: HDEVINFO;
    const DeviceInfoData: TSPDevInfoData; Property_: DWORD;
    var PropertyRegDataType: DWORD; PropertyBuffer: PBYTE; PropertyBufferSize: DWORD;
    var RequiredSize: DWORD): BOOL; stdcall;
  TSetupDiGetDeviceRegistryPropertyW = function(DeviceInfoSet: HDEVINFO;
    const DeviceInfoData: TSPDevInfoData; Property_: DWORD;
    var PropertyRegDataType: DWORD; PropertyBuffer: PBYTE; PropertyBufferSize: DWORD;
    var RequiredSize: DWORD): BOOL; stdcall;
  TSetupDiGetDeviceRegistryProperty = TSetupDiGetDeviceRegistryPropertyA;

var
  DevInfo: hDevInfo;
  SetupDiEnumDeviceInfo: TSetupDiEnumDeviceInfo;
  SetupDiSetClassInstallParams: TSetupDiSetClassInstallParams;
  SetupDiCallClassInstaller: TSetupDiCallClassInstaller;
  SetupDiGetClassDevs: TSetupDiGetClassDevs;
  SetupDiGetDeviceRegistryProperty: TSetupDiGetDeviceRegistryProperty;

var
  SetupApiLoadCount:integer=0;

function LoadSetupApi: Boolean;
var SetupApiLib:TLibHandle;
begin
  Result := True;
  Inc(SetupApiLoadCount);
  if SetupApiLoadCount > 1 then
    Exit;
  SetupApiLib:=LoadLibrary('SetupApi.dll');
  Result := SetupApiLib<>0;
  if Result then
  begin
    SetupDiEnumDeviceInfo := GetProcedureAddress(SetupApiLib, 'SetupDiEnumDeviceInfo');
    SetupDiSetClassInstallParams := GetProcedureAddress(SetupApiLib, 'SetupDiSetClassInstallParamsA');
    SetupDiCallClassInstaller := GetProcedureAddress(SetupApiLib, 'SetupDiCallClassInstaller');
    SetupDiGetClassDevs := GetProcedureAddress(SetupApiLib, 'SetupDiGetClassDevsA');
    SetupDiGetDeviceRegistryProperty := GetProcedureAddress(SetupApiLib, 'SetupDiGetDeviceRegistryPropertyA');
  end;
end;

// implementation

function StateChange(NewState, SelectedItem: DWord;
  hDevInfo: hDevInfo): TDeviceControlResult;
var
  PropChangeParams: TSPPropChangeParams;
  DeviceInfoData: TSPDevInfoData;
begin
  PropChangeParams.ClassInstallHeader.cbSize := SizeOf(TSPClassInstallHeader);
  DeviceInfoData.cbSize := SizeOf(TSPDevInfoData);
  // Get a handle to the Selected Item.
  if (not SetupDiEnumDeviceInfo(hDevInfo, SelectedItem, DeviceInfoData)) then
  begin
    Result := DCRErrEnumDeviceInfo;
    exit;
  end;
  // Set the PropChangeParams structure.
  PropChangeParams.ClassInstallHeader.InstallFunction := DIF_PROPERTYCHANGE;
  PropChangeParams.Scope := DICS_FLAG_GLOBAL;
  PropChangeParams.StateChange := NewState;
  if (not SetupDiSetClassInstallParams(hDevInfo, @DeviceInfoData,
     PSPClassInstallHeader(@PropChangeParams), SizeOf(PropChangeParams))) then
  begin
    Result := DCRErrSetClassInstallParams;
    exit;
  end;
  // Call the ClassInstaller and perform the change.
  if (not SetupDiCallClassInstaller(DIF_PROPERTYCHANGE, hDevInfo, @DeviceInfoData)) then
  begin
    Result := DCRErrDIF_PROPERTYCHANGE;
    exit;
  end;
  Result := DCROK;
end;

function GetRegistryProperty(PnPHandle: HDEVINFO;
  DevData: TSPDevInfoData; Prop: DWORD; Buffer: PChar;
  dwLength: DWord): Boolean;
var
  aBuffer: array[0..256] of Char;
begin
  dwLength := 0;
  aBuffer[0] := #0;
  SetupDiGetDeviceRegistryProperty(PnPHandle, DevData, Prop, Prop, PBYTE(@aBuffer[0]), SizeOf(aBuffer), dwLength);
  StrCopy(Buffer, aBuffer);
  Result := Buffer^ <> #0;
end;

function ConstructDeviceName(DeviceInfoSet: hDevInfo;
  DeviceInfoData: TSPDevInfoData; Buffer: PChar; dwLength: DWord): Boolean;
const
  UnknownDevice = '<Unknown Device>';
begin
  if (not GetRegistryProperty(DeviceInfoSet, DeviceInfoData, SPDRP_FRIENDLYNAME, Buffer, dwLength)) then
  begin
    if (not GetRegistryProperty(DeviceInfoSet, DeviceInfoData, SPDRP_DEVICEDESC, Buffer, dwLength)) then
    begin
      if (not GetRegistryProperty(DeviceInfoSet, DeviceInfoData, SPDRP_CLASS, Buffer, dwLength)) then
      begin
        if (not GetRegistryProperty(DeviceInfoSet, DeviceInfoData, SPDRP_CLASSGUID, Buffer, dwLength)) then
        begin
          dwLength := DWord(SizeOf(UnknownDevice));
          Buffer := Pointer(LocalAlloc(LPTR, Cardinal(dwLength)));
          StrCopy(Buffer, UnknownDevice);
        end;
      end;
    end;
  end;
  Result := true;
end;

function LoadDevices(GUID_DevClass:TGUID):TStringList;
var
  DeviceInfoData: TSPDevInfoData;
  i: DWord;
  pszText: PChar;

begin
  if (not LoadSetupAPI) then
    begin
    result:=nil;
    exit;
    end;
  DevInfo := nil;
  // Get a handle to all devices in all classes present on system
  DevInfo := SetupDiGetClassDevs(@GUID_DevClass, nil, 0, DIGCF_PRESENT);
  if (DevInfo = Pointer(INVALID_HANDLE_VALUE)) then
  begin
    result:=nil;
    exit;
  end;
  Result:=TStringList.Create;
  DeviceInfoData.cbSize := SizeOf(TSPDevInfoData);
  i := 0;
  // Enumerate though all the devices.
  while SetupDiEnumDeviceInfo(DevInfo, i, DeviceInfoData) do
  begin
    GetMem(pszText, 256);
    try
      // Get a friendly name for the device.
      ConstructDeviceName(DevInfo, DeviceInfoData, pszText, DWord(nil));
      Result.AddObject(pszText,Tobject(i));
    finally
      FreeMem(pszText);
      inc(i);
    end;
  end;
end;

function EnableDevice(SelectedItem: DWord):TDeviceControlResult;

begin
  result:=StateChange(DICS_ENABLE, SelectedItem , DevInfo);
end;

function DisableDevice(SelectedItem: DWord):TDeviceControlResult;

begin
  result:=StateChange(DICS_DISABLE, SelectedItem , DevInfo);
end;

end.

program devicetest;

{$mode delphi}{$H+}

uses
  Classes, controlwindevice;
var
  sl:tstringlist;
  i:integer;
begin
  sl:=Loaddevices(GUID_DEVCLASS_PORT);
  for i:=0 to sl.count-1 do
    writeln(i,' : ',sl[i]);
  readln(i);
  if DisableDevice(i)=DCROK then
    writeln(sl[i],' disabled');
  readln;
  if EnableDevice(i)=DCROK then
    writeln(sl[i],' enabled');
  sl.Free;
  readln;
end.

function URLDownloadToFile(pCaller: pointer; URL: PChar; FileName: PChar; Reserved: DWORD; lpfnCB : pointer): HResult; stdcall; external 'urlmon.dll' name 'URLDownloadToFileA';

procedure TForm1.Button1Click(Sender: TObject);
var Source, Dest: string;
begin
 Source:='http://lazarus.freepascal.org';
 Dest:='C:\Windows\temp\data.txt';
 if URLDownloadToFile(nil, PChar(Source), PChar(Dest), 0, nil)=0 then
  showmessage('Download ok!')
 else
  showMessage('Error downloading '+Source);
end;

program ProcessFindPID;

{$mode objfpc}{$H+}

uses 
  Classes, Sysutils, Windows, JwaTlHelp32;

function QueryFullProcessImageName(hProcess: HANDLE; dwFlags: DWORD; var lpExeName: LPTSTR;
var lpdwSize: LPDWORD): BOOL; stdcall; external 'KERNEL32.dll';

function FindInProcesses(const PName: string): DWord;
  // Looks for process with PName executable and return
var
  i: integer;
  CPID: DWORD;
  CProcName: array[0..259] of char;
  S: HANDLE;
  PE: TProcessEntry32;
begin
  Result := 0;
  CProcName := '';
  S := CreateToolHelp32Snapshot(TH32CS_SNAPALL, 0); // Create snapshot
  PE.DWSize := SizeOf(PE); // Set size before use
  I := 1;
  if Process32First(S, PE) then
    repeat
      CProcName := PE.szExeFile;
      CPID := PE.th32ProcessID;
      //if CProcName = '' then Writeln(IntToStr(i) + ' - (' + IntToStr(CPID) + ') Failed to get a process name')
      Inc(i);
      if UpperCase(CProcName) = UpperCase(PName) then
        // Found the name. Set Result to the PID of process found
        Result := CPID;
    until not Process32Next(S, PE);
  CloseHandle(S);
end;

begin
  writeln('Explorer.exe has process id '+inttostr(FindInProcesses('explorer.exe')));
end.