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- /*----------------------------------------
- EMFVIEW.C -- View Enhanced Metafiles
- (c) Charles Petzold, 1998
- ----------------------------------------*/
-
- #include <windows.h>
- #include <commdlg.h>
- #include "resource.h"
-
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
-
- TCHAR szAppName[] = TEXT ("EmfView") ;
-
- int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
- PSTR szCmdLine, int iCmdShow)
- {
- HACCEL hAccel ;
- 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 ("Enhanced Metafile Viewer"),
- WS_OVERLAPPEDWINDOW,
- CW_USEDEFAULT, CW_USEDEFAULT,
- CW_USEDEFAULT, CW_USEDEFAULT,
- NULL, NULL, hInstance, NULL) ;
-
- ShowWindow (hwnd, iCmdShow) ;
- UpdateWindow (hwnd) ;
-
- hAccel = LoadAccelerators (hInstance, szAppName) ;
-
- while (GetMessage (&msg, NULL, 0, 0))
- {
- if (!TranslateAccelerator (hwnd, hAccel, &msg))
- {
- TranslateMessage (&msg) ;
- DispatchMessage (&msg) ;
- }
- }
- return msg.wParam ;
- }
-
- HPALETTE CreatePaletteFromMetaFile (HENHMETAFILE hemf)
- {
- HPALETTE hPalette ;
- int iNum ;
- LOGPALETTE * plp ;
-
- if (!hemf)
- return NULL ;
-
- if (0 == (iNum = GetEnhMetaFilePaletteEntries (hemf, 0, NULL)))
- return NULL ;
-
- plp = malloc (sizeof (LOGPALETTE) + (iNum - 1) * sizeof (PALETTEENTRY)) ;
-
- plp->palVersion = 0x0300 ;
- plp->palNumEntries = iNum ;
-
- GetEnhMetaFilePaletteEntries (hemf, iNum, plp->palPalEntry) ;
-
- hPalette = CreatePalette (plp) ;
-
- free (plp) ;
-
- return hPalette ;
- }
-
- LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static DOCINFO di = { sizeof (DOCINFO), TEXT ("EmfView: Printing") } ;
- static HENHMETAFILE hemf ;
- static OPENFILENAME ofn ;
- static PRINTDLG printdlg = { sizeof (PRINTDLG) } ;
- static TCHAR szFileName [MAX_PATH], szTitleName [MAX_PATH] ;
- static TCHAR szFilter[] =
- TEXT ("Enhanced Metafiles (*.EMF)\0*.emf\0")
- TEXT ("All Files (*.*)\0*.*\0\0") ;
- BOOL bSuccess ;
- ENHMETAHEADER header ;
- HDC hdc, hdcPrn ;
- HENHMETAFILE hemfCopy ;
- HMENU hMenu ;
- HPALETTE hPalette ;
- int i, iLength, iEnable ;
- PAINTSTRUCT ps ;
- RECT rect ;
- PTSTR pBuffer ;
-
- switch (message)
- {
- case WM_CREATE:
- // Initialize OPENFILENAME structure
-
- ofn.lStructSize = sizeof (OPENFILENAME) ;
- ofn.hwndOwner = hwnd ;
- ofn.hInstance = NULL ;
- ofn.lpstrFilter = szFilter ;
- ofn.lpstrCustomFilter = NULL ;
- ofn.nMaxCustFilter = 0 ;
- ofn.nFilterIndex = 0 ;
- ofn.lpstrFile = szFileName ;
- ofn.nMaxFile = MAX_PATH ;
- ofn.lpstrFileTitle = szTitleName ;
- ofn.nMaxFileTitle = MAX_PATH ;
- ofn.lpstrInitialDir = NULL ;
- ofn.lpstrTitle = NULL ;
- ofn.Flags = 0 ;
- ofn.nFileOffset = 0 ;
- ofn.nFileExtension = 0 ;
- ofn.lpstrDefExt = TEXT ("emf") ;
- ofn.lCustData = 0 ;
- ofn.lpfnHook = NULL ;
- ofn.lpTemplateName = NULL ;
- return 0 ;
-
- case WM_INITMENUPOPUP:
- hMenu = GetMenu (hwnd) ;
-
- iEnable = hemf ? MF_ENABLED : MF_GRAYED ;
-
- EnableMenuItem (hMenu, IDM_FILE_SAVE_AS, iEnable) ;
- EnableMenuItem (hMenu, IDM_FILE_PRINT, iEnable) ;
- EnableMenuItem (hMenu, IDM_FILE_PROPERTIES, iEnable) ;
- EnableMenuItem (hMenu, IDM_EDIT_CUT, iEnable) ;
- EnableMenuItem (hMenu, IDM_EDIT_COPY, iEnable) ;
- EnableMenuItem (hMenu, IDM_EDIT_DELETE, iEnable) ;
-
- EnableMenuItem (hMenu, IDM_EDIT_PASTE,
- IsClipboardFormatAvailable (CF_ENHMETAFILE) ?
- MF_ENABLED : MF_GRAYED) ;
- return 0 ;
-
- case WM_COMMAND:
- switch (LOWORD (wParam))
- {
- case IDM_FILE_OPEN:
- // Show the File Open dialog box
-
- ofn.Flags = 0 ;
-
- if (!GetOpenFileName (&ofn))
- return 0 ;
-
- // If there's an existing EMF, get rid of it.
-
- if (hemf)
- {
- DeleteEnhMetaFile (hemf) ;
- hemf = NULL ;
- }
- // Load the EMF into memory
-
- SetCursor (LoadCursor (NULL, IDC_WAIT)) ;
- ShowCursor (TRUE) ;
-
- hemf = GetEnhMetaFile (szFileName) ;
-
- ShowCursor (FALSE) ;
- SetCursor (LoadCursor (NULL, IDC_ARROW)) ;
-
- // Invalidate the client area for later update
-
- InvalidateRect (hwnd, NULL, TRUE) ;
-
- if (hemf == NULL)
- {
- MessageBox (hwnd, TEXT ("Cannot load metafile"),
- szAppName, MB_ICONEXCLAMATION | MB_OK) ;
- }
- return 0 ;
-
- case IDM_FILE_SAVE_AS:
- if (!hemf)
- return 0 ;
-
- // Show the File Save dialog box
-
- ofn.Flags = OFN_OVERWRITEPROMPT ;
-
- if (!GetSaveFileName (&ofn))
- return 0 ;
-
- // Save the EMF to disk file
-
- SetCursor (LoadCursor (NULL, IDC_WAIT)) ;
- ShowCursor (TRUE) ;
-
- hemfCopy = CopyEnhMetaFile (hemf, szFileName) ;
-
- ShowCursor (FALSE) ;
- SetCursor (LoadCursor (NULL, IDC_ARROW)) ;
-
- if (hemfCopy)
- {
- DeleteEnhMetaFile (hemf) ;
- hemf = hemfCopy ;
- }
- else
- MessageBox (hwnd, TEXT ("Cannot save metafile"),
- szAppName, MB_ICONEXCLAMATION | MB_OK) ;
- return 0 ;
-
- case IDM_FILE_PRINT:
- // Show the Print dialog box and get printer DC
-
- printdlg.Flags = PD_RETURNDC | PD_NOPAGENUMS | PD_NOSELECTION ;
-
- if (!PrintDlg (&printdlg))
- return 0 ;
-
- if (NULL == (hdcPrn = printdlg.hDC))
- {
- MessageBox (hwnd, TEXT ("Cannot obtain printer DC"),
- szAppName, MB_ICONEXCLAMATION | MB_OK) ;
- return 0 ;
- }
- // Get size of printable area of page
-
- rect.left = 0 ;
- rect.right = GetDeviceCaps (hdcPrn, HORZRES) ;
- rect.top = 0 ;
- rect.bottom = GetDeviceCaps (hdcPrn, VERTRES) ;
-
- bSuccess = FALSE ;
-
- // Play the EMF to the printer
-
- SetCursor (LoadCursor (NULL, IDC_WAIT)) ;
- ShowCursor (TRUE) ;
-
- if ((StartDoc (hdcPrn, &di) > 0) && (StartPage (hdcPrn) > 0))
- {
- PlayEnhMetaFile (hdcPrn, hemf, &rect) ;
-
- if (EndPage (hdcPrn) > 0)
- {
- bSuccess = TRUE ;
- EndDoc (hdcPrn) ;
- }
- }
- ShowCursor (FALSE) ;
- SetCursor (LoadCursor (NULL, IDC_ARROW)) ;
-
- DeleteDC (hdcPrn) ;
-
- if (!bSuccess)
- MessageBox (hwnd, TEXT ("Could not print metafile"),
- szAppName, MB_ICONEXCLAMATION | MB_OK) ;
- return 0 ;
-
- case IDM_FILE_PROPERTIES:
- if (!hemf)
- return 0 ;
-
- iLength = GetEnhMetaFileDescription (hemf, 0, NULL) ;
- pBuffer = malloc ((iLength + 256) * sizeof (TCHAR)) ;
-
- GetEnhMetaFileHeader (hemf, sizeof (ENHMETAHEADER), &header) ;
-
- // Format header file information
-
- i = wsprintf (pBuffer,
- TEXT ("Bounds = (%i, %i) to (%i, %i) pixels\n"),
- header.rclBounds.left, header.rclBounds.top,
- header.rclBounds.right, header.rclBounds.bottom) ;
-
- i += wsprintf (pBuffer + i,
- TEXT ("Frame = (%i, %i) to (%i, %i) mms\n"),
- header.rclFrame.left, header.rclFrame.top,
- header.rclFrame.right, header.rclFrame.bottom) ;
-
- i += wsprintf (pBuffer + i,
- TEXT ("Resolution = (%i, %i) pixels")
- TEXT (" = (%i, %i) mms\n"),
- header.szlDevice.cx, header.szlDevice.cy,
- header.szlMillimeters.cx,
- header.szlMillimeters.cy) ;
-
- i += wsprintf (pBuffer + i,
- TEXT ("Size = %i, Records = %i, ")
- TEXT ("Handles = %i, Palette entries = %i\n"),
- header.nBytes, header.nRecords,
- header.nHandles, header.nPalEntries) ;
-
- // Include the metafile description, if present
-
- if (iLength)
- {
- i += wsprintf (pBuffer + i, TEXT ("Description = ")) ;
- GetEnhMetaFileDescription (hemf, iLength, pBuffer + i) ;
- pBuffer [lstrlen (pBuffer)] = '\t' ;
- }
-
- MessageBox (hwnd, pBuffer, TEXT ("Metafile Properties"), MB_OK) ;
- free (pBuffer) ;
- return 0 ;
-
- case IDM_EDIT_COPY:
- case IDM_EDIT_CUT:
- if (!hemf)
- return 0 ;
-
- // Transfer metafile copy to the clipboard
-
- hemfCopy = CopyEnhMetaFile (hemf, NULL) ;
-
- OpenClipboard (hwnd) ;
- EmptyClipboard () ;
- SetClipboardData (CF_ENHMETAFILE, hemfCopy) ;
- CloseClipboard () ;
-
- if (LOWORD (wParam) == IDM_EDIT_COPY)
- return 0 ;
- // fall through if IDM_EDIT_CUT
- case IDM_EDIT_DELETE:
- if (hemf)
- {
- DeleteEnhMetaFile (hemf) ;
- hemf = NULL ;
- InvalidateRect (hwnd, NULL, TRUE) ;
- }
- return 0 ;
-
- case IDM_EDIT_PASTE:
- OpenClipboard (hwnd) ;
- hemfCopy = GetClipboardData (CF_ENHMETAFILE) ;
- CloseClipboard () ;
-
- if (hemfCopy && hemf)
- {
- DeleteEnhMetaFile (hemf) ;
- hemf = NULL ;
- }
-
- hemf = CopyEnhMetaFile (hemfCopy, NULL) ;
- InvalidateRect (hwnd, NULL, TRUE) ;
- return 0 ;
-
- case IDM_APP_ABOUT:
- MessageBox (hwnd, TEXT ("Enhanced Metafile Viewer\n")
- TEXT ("(c) Charles Petzold, 1998"),
- szAppName, MB_OK) ;
- return 0 ;
-
- case IDM_APP_EXIT:
- SendMessage (hwnd, WM_CLOSE, 0, 0L) ;
- return 0 ;
- }
- break ;
-
- case WM_PAINT:
- hdc = BeginPaint (hwnd, &ps) ;
-
- if (hemf)
- {
- if (hPalette = CreatePaletteFromMetaFile (hemf))
- {
- SelectPalette (hdc, hPalette, FALSE) ;
- RealizePalette (hdc) ;
- }
- GetClientRect (hwnd, &rect) ;
- PlayEnhMetaFile (hdc, hemf, &rect) ;
-
- if (hPalette)
- DeleteObject (hPalette) ;
- }
- EndPaint (hwnd, &ps) ;
- return 0 ;
-
- case WM_QUERYNEWPALETTE:
- if (!hemf || !(hPalette = CreatePaletteFromMetaFile (hemf)))
- return FALSE ;
-
- hdc = GetDC (hwnd) ;
- SelectPalette (hdc, hPalette, FALSE) ;
- RealizePalette (hdc) ;
- InvalidateRect (hwnd, NULL, FALSE) ;
-
- DeleteObject (hPalette) ;
- ReleaseDC (hwnd, hdc) ;
- return TRUE ;
-
- case WM_PALETTECHANGED:
- if ((HWND) wParam == hwnd)
- break ;
-
- if (!hemf || !(hPalette = CreatePaletteFromMetaFile (hemf)))
- break ;
-
- hdc = GetDC (hwnd) ;
- SelectPalette (hdc, hPalette, FALSE) ;
- RealizePalette (hdc) ;
- UpdateColors (hdc) ;
-
- DeleteObject (hPalette) ;
- ReleaseDC (hwnd, hdc) ;
- break ;
-
- case WM_DESTROY:
- if (hemf)
- DeleteEnhMetaFile (hemf) ;
-
- PostQuitMessage (0) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-