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- /*-----------------------------------------
- SEQDISP.C -- Sequential Display of DIBs
- (c) Charles Petzold, 1998
- -----------------------------------------*/
-
- #include <windows.h>
- #include "resource.h"
-
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
-
- TCHAR szAppName[] = TEXT ("SeqDisp") ;
-
- 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 ("DIB Sequential Display"),
- 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 ;
- }
-
- LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static BITMAPINFO * pbmi ;
- static BYTE * pBits ;
- static int cxDib, cyDib, cBits ;
- static OPENFILENAME ofn ;
- static TCHAR szFileName [MAX_PATH], szTitleName [MAX_PATH] ;
- static TCHAR szFilter[] = TEXT ("Bitmap Files (*.BMP)\0*.bmp\0")
- TEXT ("All Files (*.*)\0*.*\0\0") ;
- BITMAPFILEHEADER bmfh ;
- BOOL bSuccess, bTopDown ;
- DWORD dwBytesRead ;
- HANDLE hFile ;
- HDC hdc ;
- HMENU hMenu ;
- int iInfoSize, iBitsSize, iRowLength, y ;
- PAINTSTRUCT ps ;
-
- switch (message)
- {
- case WM_CREATE:
- 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 ("bmp") ;
- ofn.lCustData = 0 ;
- ofn.lpfnHook = NULL ;
- ofn.lpTemplateName = NULL ;
- return 0 ;
-
- case WM_COMMAND:
- hMenu = GetMenu (hwnd) ;
-
- switch (LOWORD (wParam))
- {
- case IDM_FILE_OPEN:
- // Display File Open dialog
-
- if (!GetOpenFileName (&ofn))
- return 0 ;
-
- // Get rid of old DIB
-
- if (pbmi)
- {
- free (pbmi) ;
- pbmi = NULL ;
- }
-
- if (pBits)
- {
- free (pBits) ;
- pBits = NULL ;
- }
-
- // Generate WM_PAINT message to erase background
-
- InvalidateRect (hwnd, NULL, TRUE) ;
- UpdateWindow (hwnd) ;
-
- // Open the file
-
- hFile = CreateFile (szFileName, GENERIC_READ,
- FILE_SHARE_READ, NULL, OPEN_EXISTING,
- FILE_FLAG_SEQUENTIAL_SCAN, NULL) ;
-
- if (hFile == INVALID_HANDLE_VALUE)
- {
- MessageBox (hwnd, TEXT ("Cannot open file."),
- szAppName, MB_ICONWARNING | MB_OK) ;
- return 0 ;
- }
-
- // Read in the BITMAPFILEHEADER
-
- bSuccess = ReadFile (hFile, &bmfh, sizeof (BITMAPFILEHEADER),
- &dwBytesRead, NULL) ;
-
- if (!bSuccess || dwBytesRead != sizeof (BITMAPFILEHEADER))
- {
- MessageBox (hwnd, TEXT ("Cannot read file."),
- szAppName, MB_ICONWARNING | MB_OK) ;
- CloseHandle (hFile) ;
- return 0 ;
- }
-
- // Check that it's a bitmap
-
- if (bmfh.bfType != * (WORD *) "BM")
- {
- MessageBox (hwnd, TEXT ("File is not a bitmap."),
- szAppName, MB_ICONWARNING | MB_OK) ;
- CloseHandle (hFile) ;
- return 0 ;
- }
-
- // Allocate memory for header and bits
-
- iInfoSize = bmfh.bfOffBits - sizeof (BITMAPFILEHEADER) ;
- iBitsSize = bmfh.bfSize - bmfh.bfOffBits ;
-
- pbmi = malloc (iInfoSize) ;
- pBits = malloc (iBitsSize) ;
-
- if (pbmi == NULL || pBits == NULL)
- {
- MessageBox (hwnd, TEXT ("Cannot allocate memory."),
- szAppName, MB_ICONWARNING | MB_OK) ;
- if (pbmi)
- free (pbmi) ;
- if (pBits)
- free (pBits) ;
- CloseHandle (hFile) ;
- return 0 ;
- }
-
- // Read in the Information Header
-
- bSuccess = ReadFile (hFile, pbmi, iInfoSize,
- &dwBytesRead, NULL) ;
-
- if (!bSuccess || (int) dwBytesRead != iInfoSize)
- {
- MessageBox (hwnd, TEXT ("Cannot read file."),
- szAppName, MB_ICONWARNING | MB_OK) ;
- if (pbmi)
- free (pbmi) ;
- if (pBits)
- free (pBits) ;
- CloseHandle (hFile) ;
- return 0 ;
- }
-
- // Get the DIB width and height
-
- bTopDown = FALSE ;
-
- if (pbmi->bmiHeader.biSize == sizeof (BITMAPCOREHEADER))
- {
- cxDib = ((BITMAPCOREHEADER *) pbmi)->bcWidth ;
- cyDib = ((BITMAPCOREHEADER *) pbmi)->bcHeight ;
- cBits = ((BITMAPCOREHEADER *) pbmi)->bcBitCount ;
- }
- else
- {
- if (pbmi->bmiHeader.biHeight < 0)
- bTopDown = TRUE ;
-
- cxDib = pbmi->bmiHeader.biWidth ;
- cyDib = abs (pbmi->bmiHeader.biHeight) ;
- cBits = pbmi->bmiHeader.biBitCount ;
-
- if (pbmi->bmiHeader.biCompression != BI_RGB &&
- pbmi->bmiHeader.biCompression != BI_BITFIELDS)
- {
- MessageBox (hwnd, TEXT ("File is compressed."),
- szAppName, MB_ICONWARNING | MB_OK) ;
- if (pbmi)
- free (pbmi) ;
- if (pBits)
- free (pBits) ;
- CloseHandle (hFile) ;
- return 0 ;
- }
- }
-
- // Get the row length
-
- iRowLength = ((cxDib * cBits + 31) & ~31) >> 3 ;
-
- // Read and display
-
- SetCursor (LoadCursor (NULL, IDC_WAIT)) ;
- ShowCursor (TRUE) ;
-
- hdc = GetDC (hwnd) ;
-
- for (y = 0 ; y < cyDib ; y++)
- {
- ReadFile (hFile, pBits + y * iRowLength, iRowLength,
- &dwBytesRead, NULL) ;
-
- SetDIBitsToDevice (hdc,
- 0, // xDst
- 0, // yDst
- cxDib, // cxSrc
- cyDib, // cySrc
- 0, // xSrc
- 0, // ySrc
- bTopDown ? cyDib - y - 1 : y,
- // first scan line
- 1, // number of scan lines
- pBits + y * iRowLength,
- pbmi,
- DIB_RGB_COLORS) ;
- }
- ReleaseDC (hwnd, hdc) ;
- CloseHandle (hFile) ;
- ShowCursor (FALSE) ;
- SetCursor (LoadCursor (NULL, IDC_ARROW)) ;
- return 0 ;
- }
- break ;
-
- case WM_PAINT:
- hdc = BeginPaint (hwnd, &ps) ;
-
- if (pbmi && pBits)
- SetDIBitsToDevice (hdc,
- 0, // xDst
- 0, // yDst
- cxDib, // cxSrc
- cyDib, // cySrc
- 0, // xSrc
- 0, // ySrc
- 0, // first scan line
- cyDib, // number of scan lines
- pBits,
- pbmi,
- DIB_RGB_COLORS) ;
- EndPaint (hwnd, &ps) ;
- return 0 ;
-
- case WM_DESTROY:
- if (pbmi)
- free (pbmi) ;
-
- if (pBits)
- free (pBits) ;
-
- PostQuitMessage (0) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-