Delphi

Question:
I want to get position of exe path from window handle. Can I get the code?

Answer:
This not simple, but here the code:


uses
PsAPI, TlHelp32;
const
RsSystemIdleProcess = 'System Idle Process';
RsSystemProcess = 'System Process';

function IsWinXP: Boolean;
begin
Result := (Win32Platform = VER_PLATFORM_WIN32_NT) and
(Win32MajorVersion = 5) and (Win32MinorVersion = 1);
end;

function IsWin2k: Boolean;
begin
Result := (Win32MajorVersion >= 5) and
(Win32Platform = VER_PLATFORM_WIN32_NT);
end;

function IsWinNT4: Boolean;
begin
Result := Win32Platform = VER_PLATFORM_WIN32_NT;
Result := Result and (Win32MajorVersion = 4);
end;

function IsWin3X: Boolean;
begin
Result := Win32Platform = VER_PLATFORM_WIN32_NT;
Result := Result and (Win32MajorVersion = 3) and
((Win32MinorVersion = 1) or (Win32MinorVersion = 5) or
(Win32MinorVersion = 51));
end;

function RunningProcessesList(const List: TStrings; FullPath: Boolean): Boolean;

function ProcessFileName(PID: DWORD): string;
var
Handle: THandle;
begin
Result := '';
Handle := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, False, PID);
if Handle <> 0 then
try
SetLength(Result, MAX_PATH);
if FullPath then
begin
if GetModuleFileNameEx(Handle, 0, PChar(Result), MAX_PATH) > 0 then
SetLength(Result, StrLen(PChar(Result)))
else
Result := '';
end
else
begin
if GetModuleBaseNameA(Handle, 0, PChar(Result), MAX_PATH) > 0 then
SetLength(Result, StrLen(PChar(Result)))
else
Result := '';
end;
finally
CloseHandle(Handle);
end;
end;

function BuildListTH: Boolean;
var
SnapProcHandle: THandle;
ProcEntry: TProcessEntry32;
NextProc: Boolean;
FileName: string;
begin
SnapProcHandle := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
Result := (SnapProcHandle <> INVALID_HANDLE_VALUE);
if Result then
try
ProcEntry.dwSize := SizeOf(ProcEntry);
NextProc := Process32First(SnapProcHandle, ProcEntry);
while NextProc do
begin
if ProcEntry.th32ProcessID = 0 then
begin
FileName := RsSystemIdleProcess;
end
else
begin
if IsWin2k or IsWinXP then
begin
FileName := ProcessFileName(ProcEntry.th32ProcessID);
if FileName = '' then
FileName := ProcEntry.szExeFile;
end
else
begin
FileName := ProcEntry.szExeFile;
if not FullPath then
FileName := ExtractFileName(FileName);
end;
end;
List.AddObject(FileName, Pointer(ProcEntry.th32ProcessID));
NextProc := Process32Next(SnapProcHandle, ProcEntry);
end;
finally
CloseHandle(SnapProcHandle);
end;
end;

function BuildListPS: Boolean;
var
PIDs: array [0..1024] of DWORD;
Needed: DWORD;
I: Integer;
FileName: string;
begin
Result := EnumProcesses(@PIDs, SizeOf(PIDs), Needed);
if Result then
begin
for I := 0 to (Needed div SizeOf(DWORD)) - 1 do
begin
case PIDs[I] of
0:
FileName := RsSystemIdleProcess;
2:
if IsWinNT4 then
FileName := RsSystemProcess
else
FileName := ProcessFileName(PIDs[I]);
8:
if IsWin2k or IsWinXP then
FileName := RsSystemProcess
else
FileName := ProcessFileName(PIDs[I]);
else
FileName := ProcessFileName(PIDs[I]);
end;
if FileName <> '' then
List.AddObject(FileName, Pointer(PIDs[I]));
end;
end;
end;
begin
if IsWin3X or IsWinNT4 then
Result := BuildListPS
else
Result := BuildListTH;
end;

function GetProcessNameFromWnd(Wnd: HWND): string;
var
List: TStringList;
PID: DWORD;
I: Integer;
begin
Result := '';
if IsWindow(Wnd) then
begin
PID := INVALID_HANDLE_VALUE;
GetWindowThreadProcessId(Wnd, @PID);
List := TStringList.Create;
try
if RunningProcessesList(List, True) then
begin
I := List.IndexOfObject(Pointer(PID));
if I > -1 then
Result := List[I];
end;
finally
List.Free;
end;
end;
end;