Last updated: 5. 2.1998, 23:25
<* +M2EXTENSIONS *> MODULE Environ; (*---------------------------------------- ENVIRON.C --- Environment List Box (c) Charles Petzold, 1996 Environ.MOD --- Translation to XDS Modula-2 (c) Peter Stadler, 1997 ----------------------------------------*) IMPORT Windows; IMPORT SYSTEM; IMPORT Str; IMPORT ProgEnv; CONST MAXENV =4096; szAppName = "Environ"; VAR hwnd : Windows.HWND; msg : Windows.MSG; wc : Windows.WNDCLASSEX; TYPE PBUFFER = POINTER TO ARRAY[0..MAXENV-1] OF CHAR; ONECHARSTR = ARRAY[0..0] OF CHAR; VAR lpszBuffer : PBUFFER; hwndList : Windows.HWND; hwndText : Windows.HWND; item : ARRAY[0..100] OF CHAR; (*++++*****************************************************************) PROCEDURE [Windows.CALLBACK] WndProc (hwnd : Windows.HWND; (**********************************************************************) iMsg : Windows.UINT; wParam : Windows.WPARAM; lParam : Windows.LPARAM) : Windows.LRESULT; VAR i,j : INTEGER; tm : Windows.TEXTMETRIC; hdc : Windows.HDC; ok : BOOLEAN; CONST lb = "listbox"; st = "static"; BEGIN CASE (iMsg) OF | Windows.WM_CREATE : hdc := Windows.GetDC (hwnd); Windows.GetTextMetrics (hdc, tm); Windows.ReleaseDC (hwnd, hdc); hwndList := Windows.CreateWindow (SYSTEM.ADR(lb), "", Windows.WS_CHILD + Windows.WS_VISIBLE + Windows.LBS_STANDARD, tm.tmAveCharWidth, tm.tmHeight * 3, tm.tmAveCharWidth * 16 + Windows.GetSystemMetrics (Windows.SM_CXVSCROLL), tm.tmHeight * 5, hwnd, SYSTEM.CAST(Windows.HMENU,1), SYSTEM.CAST(Windows.HINSTANCE,Windows.GetWindowLong (hwnd, Windows.GWL_HINSTANCE)), NIL); hwndText := Windows.CreateWindow (SYSTEM.ADR(st), "", Windows.WS_CHILD + Windows.WS_VISIBLE + Windows.SS_LEFT, tm.tmAveCharWidth, tm.tmHeight, tm.tmAveCharWidth * MAXENV, tm.tmHeight, hwnd, SYSTEM.CAST(Windows.HMENU,2), SYSTEM.CAST(Windows.HINSTANCE,Windows.GetWindowLong (hwnd, Windows.GWL_HINSTANCE)), NIL); lpszBuffer:= SYSTEM.CAST(PBUFFER,Windows.GetEnvironmentStrings()); i := 0; item[0] := ''; LOOP LOOP IF(lpszBuffer^[i]='') THEN INC(i); EXIT; END; Str.Append(item,SYSTEM.CAST(ONECHARSTR,lpszBuffer^[i])); INC(i); END; IF(lpszBuffer^[i+1]='') THEN EXIT; END; j := 0; LOOP IF(item[j]='=') THEN item[j] := ''; EXIT; END; INC(j); END; Windows.SendMessage (hwndList, Windows.LB_ADDSTRING, 0, SYSTEM.CAST(Windows.LPARAM,SYSTEM.ADR(item))); item[0] := ''; END; RETURN 0; | Windows.WM_SETFOCUS : Windows.SetFocus (hwndList); RETURN 0; | Windows.WM_COMMAND : IF (Windows.LOWORD (wParam) = 1) AND (Windows.HIWORD (wParam) = Windows.LBN_SELCHANGE) THEN i := Windows.SendMessage (hwndList, Windows.LB_GETCURSEL, 0, 0); i := Windows.SendMessage (hwndList, Windows.LB_GETTEXT, i, SYSTEM.CAST(Windows.LPARAM,lpszBuffer)); ProgEnv.GetArg(i,item); (* ok := Environment.GetSymbol(lpszBuffer^,item); Str.Append(lpszBuffer^,'='); Str.Append(lpszBuffer^,item); *) Windows.SetWindowText (hwndText, item); END; RETURN 0; | Windows.WM_DESTROY : Windows.PostQuitMessage (0); RETURN 0; ELSE RETURN Windows.DefWindowProc (hwnd, iMsg, wParam, lParam); END; END WndProc; (*++++*****************************************************************) PROCEDURE InitApplication () : BOOLEAN; (**********************************************************************) VAR rc : CARDINAL; BEGIN wc.cbSize := SIZE(wc); wc.style := Windows.CS_HREDRAW + Windows.CS_VREDRAW; wc.lpfnWndProc := WndProc; wc.cbClsExtra := 0; wc.cbWndExtra := 0; wc.hInstance := Windows.MyInstance(); wc.hIcon := Windows.LoadIcon (NIL, Windows.IDI_APPLICATION); wc.hCursor := Windows.LoadCursor (NIL, Windows.IDC_ARROW); wc.hbrBackground := SYSTEM.CAST(Windows.HBRUSH, SYSTEM.CAST(CARDINAL,Windows.COLOR_WINDOW)+1); wc.lpszMenuName := NIL; wc.lpszClassName := SYSTEM.ADR(szAppName); wc.hIconSm := Windows.LoadIcon (NIL,Windows.IDI_APPLICATION); rc := Windows.RegisterClassEx(wc); RETURN rc#0; END InitApplication; (*++++*****************************************************************) PROCEDURE InitMainWindow () : BOOLEAN; (**********************************************************************) BEGIN hwnd := Windows.CreateWindow ( SYSTEM.ADR(szAppName), (* window class name *) "Environment List Box: Translation to XDS Modula-2", (* window caption *) Windows.WS_OVERLAPPEDWINDOW, (* window style *) Windows.CW_USEDEFAULT, (* initial x position *) Windows.CW_USEDEFAULT, (* initial y position *) Windows.CW_USEDEFAULT, (* initial x size *) Windows.CW_USEDEFAULT, (* initial y size *) NIL, (* parent window handle *) NIL, (* window menu handle *) wc.hInstance, (* program instance handle *) NIL); (* creation parameters *) IF hwnd = NIL THEN RETURN FALSE; END; Windows.ShowWindow (hwnd, Windows.SW_SHOWDEFAULT); Windows.UpdateWindow (hwnd); RETURN TRUE; END InitMainWindow; BEGIN IF InitApplication() AND InitMainWindow() THEN WHILE (Windows.GetMessage(msg,NIL,0,0)) DO Windows.TranslateMessage(msg); Windows.DispatchMessage(msg); END; END; END Environ.