CLIPTEXT.C
/******************************************************************************\
* This is a part of the Microsoft Source Code Samples.
* Copyright 1993 - 1998 Microsoft Corp.
* All rights reserved.
* This source code is only intended as a supplement to
* Microsoft Development Tools and/or WinHelp documentation.
* See these sources for detailed information regarding the
* Microsoft samples programs.
\******************************************************************************/
/****************************************************************************
PROGRAM: Cliptext.c
PURPOSE: Demonstrates copying text to and from the clipboard
FUNCTIONS:
WinMain() - calls initialization function, processes message loop
InitApplication() - initializes window data and registers window
InitInstance() - saves instance handle and creates main window
MainWndProc() - processes messages
About() - processes messages for "About" dialog box
OutOfMemory() - displays warning message
****************************************************************************/
#include "cliptext.h"
#include <string.h>
HANDLE hInst;
HANDLE hAccTable;
HWND hwnd;
HANDLE hText = NULL;
CHAR szInitialClientAreaText[] =
"This program demonstrates the use of the Edit menu to copy and "
"paste text to and from the clipboard. Try using the Copy command "
"to move this text to the clipboard, and the Paste command to replace "
"this text with data from another application. \r\n\r\n"
"You might want to try running Notepad and Clipbrd alongside this "
"application so that you can watch the data exchanges take place. ";
HANDLE hData, hClipData; /* handles to clip data */
LPSTR lpData, lpClipData; /* pointers to clip data */
/* functions declared here, because of MIPS lack of passing C_DEFINES*/
BOOL InitApplication(HANDLE);
BOOL InitInstance(HANDLE, INT);
LONG APIENTRY MainWndProc(HWND, UINT, UINT, LONG);
BOOL APIENTRY About(HWND, UINT, UINT, LONG);
VOID OutOfMemory(VOID);
/****************************************************************************
FUNCTION: WinMain(HANDLE, HANDLE, LPSTR, int)
PURPOSE: calls initialization function, processes message loop
****************************************************************************/
int APIENTRY WinMain(
HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow
)
{
MSG msg;
UNREFERENCED_PARAMETER( lpCmdLine );
if (!hPrevInstance)
if (!InitApplication(hInstance))
return (FALSE);
if (!InitInstance(hInstance, nCmdShow))
return (FALSE);
while (GetMessage(&msg, NULL, 0, 0)) {
/* Only translate message if it is not an accelerator message */
if (!TranslateAccelerator(hwnd, hAccTable, &msg)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (msg.wParam);
}
/****************************************************************************
FUNCTION: InitApplication(HANDLE)
PURPOSE: Initializes window data and registers window class
****************************************************************************/
BOOL InitApplication(HANDLE hInstance)
{
WNDCLASS wc;
wc.style = 0;
wc.lpfnWndProc = (WNDPROC) MainWndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = GetStockObject(WHITE_BRUSH);
wc.lpszMenuName = "CliptextMenu";
wc.lpszClassName = "CliptextWClass";
return (RegisterClass(&wc));
}
/****************************************************************************
FUNCTION: InitInstance(HANDLE, int)
PURPOSE: Saves instance handle and creates main window
****************************************************************************/
BOOL InitInstance(
HANDLE hInstance,
INT nCmdShow)
{
LPSTR lpszText;
hInst = hInstance;
hAccTable = LoadAccelerators(hInst, "ClipTextAcc");
if (!(hText
= GlobalAlloc(GMEM_MOVEABLE,(DWORD)sizeof(szInitialClientAreaText)))) {
OutOfMemory();
return (FALSE);
}
if (!(lpszText = GlobalLock(hText))) {
OutOfMemory();
return (FALSE);
}
strcpy(lpszText, szInitialClientAreaText);
GlobalUnlock(hText);
hwnd = CreateWindow(
"CliptextWClass",
"Cliptext Sample Application",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL
);
if (!hwnd)
return (FALSE);
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
return (TRUE);
}
/****************************************************************************
FUNCTION: MainWndProc(HWND, unsigned, WORD, LONG)
PURPOSE: Processes messages
MESSAGES:
WM_COMMAND - message from menu
WM_INITMENU - initialize menu
WM_PAINT - update window
WM_DESTROY - destroy window
COMMENTS:
WM_INITMENU - when this message is received, the application checks
to see if there is any text data in the clipboard, and enables or
disables the Paste menu item accordingly.
Seclecting the Copy menu item will send the text "Hello Windows" to
the clipboard.
Seclecting the Paste menu item will copy whatever text is in the
clipboard to the application window.
****************************************************************************/
LONG APIENTRY MainWndProc(HWND hWnd, UINT message, UINT wParam, LONG lParam)
{
HDC hDC;
PAINTSTRUCT ps;
RECT rectClient;
LPSTR lpszText;
switch (message) {
case WM_INITMENU:
if (wParam == (UINT)GetMenu(hWnd)) {
if (OpenClipboard(hWnd)) {
if (IsClipboardFormatAvailable(CF_TEXT)
|| IsClipboardFormatAvailable(CF_OEMTEXT))
EnableMenuItem((HMENU)wParam, IDM_PASTE, MF_ENABLED);
else
EnableMenuItem((HMENU)wParam, IDM_PASTE, MF_GRAYED);
CloseClipboard();
return (TRUE);
}
else /* Clipboard is not available */
return (FALSE);
}
return (TRUE);
case WM_COMMAND:
switch(LOWORD(wParam)) {
case IDM_ABOUT:
DialogBox(hInst, "AboutBox", hWnd, About);
break;
/* file menu commands */
case IDM_NEW:
case IDM_OPEN:
case IDM_SAVE:
case IDM_SAVEAS:
case IDM_PRINT:
MessageBox (
GetFocus ()
, "Command not implemented."
, "ClipText Sample Application"
, MB_ICONASTERISK | MB_OK
);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
/* edit menu commands */
case IDM_UNDO:
case IDM_CLEAR:
MessageBox (
GetFocus ()
, "Command not implemented."
, "ClipText Sample Application"
, MB_ICONASTERISK | MB_OK
);
break;
case IDM_CUT:
case IDM_COPY:
if (hText != NULL) {
/* Allocate memory and copy the string to it */
if (!(hData
= GlobalAlloc(GMEM_DDESHARE, GlobalSize (hText)))) {
OutOfMemory();
return (TRUE);
}
if (!(lpData = GlobalLock(hData))) {
OutOfMemory();
return (TRUE);
}
if (!(lpszText = GlobalLock (hText))) {
OutOfMemory();
return (TRUE);
}
strcpy(lpData, lpszText);
GlobalUnlock(hData);
GlobalUnlock (hText);
/* Clear the current contents of the clipboard, and set
* the data handle to the new string.
*/
if (OpenClipboard(hWnd)) {
EmptyClipboard();
SetClipboardData(CF_TEXT, hData);
CloseClipboard();
}
hData = NULL;
if (LOWORD(wParam) == IDM_CUT) {
GlobalFree (hText);
hText = NULL;
EnableMenuItem(GetMenu (hWnd), IDM_CUT, MF_GRAYED);
EnableMenuItem(GetMenu(hWnd), IDM_COPY, MF_GRAYED);
InvalidateRect (hWnd, NULL, TRUE);
UpdateWindow (hWnd);
}
}
return (TRUE);
case IDM_PASTE:
if (OpenClipboard(hWnd)) {
/* get text from the clipboard */
if (!(hClipData = GetClipboardData(CF_TEXT))) {
CloseClipboard();
break;
}
if (hText != NULL) {
GlobalFree(hText);
}
if (!(hText = GlobalAlloc(GMEM_MOVEABLE
, GlobalSize(hClipData)))) {
OutOfMemory();
CloseClipboard();
break;
}
if (!(lpClipData = GlobalLock(hClipData))) {
OutOfMemory();
CloseClipboard();
break;
}
if (!(lpszText = GlobalLock(hText))) {
OutOfMemory();
CloseClipboard();
break;
}
strcpy(lpszText, lpClipData);
GlobalUnlock(hClipData);
CloseClipboard();
GlobalUnlock(hText);
EnableMenuItem(GetMenu(hWnd), IDM_CUT, MF_ENABLED);
EnableMenuItem(GetMenu(hWnd), IDM_COPY, MF_ENABLED);
/* copy text to the application window */
InvalidateRect(hWnd, NULL, TRUE);
UpdateWindow(hWnd);
return (TRUE);
}
else
return (FALSE);
}
break;
case WM_SIZE:
InvalidateRect(hWnd, NULL, TRUE);
break;
case WM_PAINT:
hDC = BeginPaint (hWnd, &ps);
if (hText != NULL) {
if (!(lpszText = GlobalLock (hText))) {
OutOfMemory();
} else {
GetClientRect (hWnd, &rectClient);
DrawText (hDC, lpszText, -1, &rectClient
, DT_EXTERNALLEADING | DT_NOPREFIX | DT_WORDBREAK);
GlobalUnlock (hText);
}
}
EndPaint (hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return (DefWindowProc(hWnd, message, wParam, lParam));
}
return (0);
}
/****************************************************************************
FUNCTION: About(HWND, unsigned, WORD, LONG)
PURPOSE: Processes messages for "About" dialog box
MESSAGES:
WM_INITDIALOG - initialize dialog box
WM_COMMAND - Input received
****************************************************************************/
BOOL APIENTRY About( HWND hDlg, UINT message, UINT wParam, LONG lParam)
{
switch (message) {
case WM_INITDIALOG:
return (TRUE);
case WM_COMMAND:
if (LOWORD(wParam) == IDOK
|| LOWORD(wParam) == IDCANCEL) {
EndDialog(hDlg, TRUE);
return (TRUE);
}
break;
}
return (FALSE);
UNREFERENCED_PARAMETER(lParam);
}
/****************************************************************************
FUNCTION: OutOfMemory(void)
PURPOSE: Displays warning message
****************************************************************************/
VOID OutOfMemory()
{
MessageBox(
GetFocus(),
"Out of Memory",
NULL,
MB_ICONHAND | MB_SYSTEMMODAL);
return;
}