home *** CD-ROM | disk | FTP | other *** search
- /*--------------------------------------------------------
- STRPROG.C -- Program using STRLIB dynamic-link library
- (c) Charles Petzold, 1998
- --------------------------------------------------------*/
-
- #include <windows.h>
- #include "strlib.h"
- #include "resource.h"
-
- typedef struct
- {
- HDC hdc ;
- int xText ;
- int yText ;
- int xStart ;
- int yStart ;
- int xIncr ;
- int yIncr ;
- int xMax ;
- int yMax ;
- }
- CBPARAM ;
-
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
-
- TCHAR szAppName [] = TEXT ("StrProg") ;
- TCHAR szString [MAX_LENGTH + 1] ;
-
- int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
- PSTR szCmdLine, int iCmdShow)
- {
- HWND hwnd ;
- MSG msg ;
- WNDCLASS wndclass ;
-
- wndclass.style = CS_HREDRAW | CS_VREDRAW ;
- wndclass.lpfnWndProc = WndProc ;
- wndclass.cbClsExtra = 0 ;
- wndclass.cbWndExtra = 0 ;
- wndclass.hInstance = hInstance ;
- wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
- wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
- wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
- wndclass.lpszMenuName = szAppName ;
- wndclass.lpszClassName = szAppName ;
-
- if (!RegisterClass (&wndclass))
- {
- MessageBox (NULL, TEXT ("This program requires Windows NT!"),
- szAppName, MB_ICONERROR) ;
- return 0 ;
- }
-
- hwnd = CreateWindow (szAppName, TEXT ("DLL Demonstration Program"),
- WS_OVERLAPPEDWINDOW,
- CW_USEDEFAULT, CW_USEDEFAULT,
- CW_USEDEFAULT, CW_USEDEFAULT,
- NULL, NULL, hInstance, NULL) ;
-
- ShowWindow (hwnd, iCmdShow) ;
- UpdateWindow (hwnd) ;
-
- while (GetMessage (&msg, NULL, 0, 0))
- {
- TranslateMessage (&msg) ;
- DispatchMessage (&msg) ;
- }
- return msg.wParam ;
- }
-
- BOOL CALLBACK DlgProc (HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
- {
- switch (message)
- {
- case WM_INITDIALOG:
- SendDlgItemMessage (hDlg, IDC_STRING, EM_LIMITTEXT, MAX_LENGTH, 0) ;
- return TRUE ;
-
- case WM_COMMAND:
- switch (wParam)
- {
- case IDOK:
- GetDlgItemText (hDlg, IDC_STRING, szString, MAX_LENGTH) ;
- EndDialog (hDlg, TRUE) ;
- return TRUE ;
-
- case IDCANCEL:
- EndDialog (hDlg, FALSE) ;
- return TRUE ;
- }
- }
- return FALSE ;
- }
-
- BOOL CALLBACK GetStrCallBack (PTSTR pString, CBPARAM * pcbp)
- {
- TextOut (pcbp->hdc, pcbp->xText, pcbp->yText,
- pString, lstrlen (pString)) ;
-
- if ((pcbp->yText += pcbp->yIncr) > pcbp->yMax)
- {
- pcbp->yText = pcbp->yStart ;
- if ((pcbp->xText += pcbp->xIncr) > pcbp->xMax)
- return FALSE ;
- }
- return TRUE ;
- }
-
- LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static HINSTANCE hInst ;
- static int cxChar, cyChar, cxClient, cyClient ;
- static UINT iDataChangeMsg ;
- CBPARAM cbparam ;
- HDC hdc ;
- PAINTSTRUCT ps ;
- TEXTMETRIC tm ;
-
- switch (message)
- {
- case WM_CREATE:
- hInst = ((LPCREATESTRUCT) lParam)->hInstance ;
- hdc = GetDC (hwnd) ;
- GetTextMetrics (hdc, &tm) ;
- cxChar = (int) tm.tmAveCharWidth ;
- cyChar = (int) (tm.tmHeight + tm.tmExternalLeading) ;
- ReleaseDC (hwnd, hdc) ;
-
- // Register message for notifying instances of data changes
-
- iDataChangeMsg = RegisterWindowMessage (TEXT ("StrProgDataChange")) ;
- return 0 ;
-
- case WM_COMMAND:
- switch (wParam)
- {
- case IDM_ENTER:
- if (DialogBox (hInst, TEXT ("EnterDlg"), hwnd, &DlgProc))
- {
- if (AddString (szString))
- PostMessage (HWND_BROADCAST, iDataChangeMsg, 0, 0) ;
- else
- MessageBeep (0) ;
- }
- break ;
-
- case IDM_DELETE:
- if (DialogBox (hInst, TEXT ("DeleteDlg"), hwnd, &DlgProc))
- {
- if (DeleteString (szString))
- PostMessage (HWND_BROADCAST, iDataChangeMsg, 0, 0) ;
- else
- MessageBeep (0) ;
- }
- break ;
- }
- return 0 ;
-
- case WM_SIZE:
- cxClient = (int) LOWORD (lParam) ;
- cyClient = (int) HIWORD (lParam) ;
- return 0 ;
-
- case WM_PAINT:
- hdc = BeginPaint (hwnd, &ps) ;
-
- cbparam.hdc = hdc ;
- cbparam.xText = cbparam.xStart = cxChar ;
- cbparam.yText = cbparam.yStart = cyChar ;
- cbparam.xIncr = cxChar * MAX_LENGTH ;
- cbparam.yIncr = cyChar ;
- cbparam.xMax = cbparam.xIncr * (1 + cxClient / cbparam.xIncr) ;
- cbparam.yMax = cyChar * (cyClient / cyChar - 1) ;
-
- GetStrings ((GETSTRCB) GetStrCallBack, (PVOID) &cbparam) ;
-
- EndPaint (hwnd, &ps) ;
- return 0 ;
-
- case WM_DESTROY:
- PostQuitMessage (0) ;
- return 0 ;
-
- default:
- if (message == iDataChangeMsg)
- InvalidateRect (hwnd, NULL, TRUE) ;
- break ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-