mdi_unit.c

An advanced text editor

#include <windows.h>
#include <commctrl.h>

#include "mdi_unit.rh"

#define ID_STATUSBAR       4997
#define ID_TOOLBAR         4998

#define ID_MDI_CLIENT      4999
#define ID_MDI_FIRSTCHILD  50000

#define IDC_CHILD_EDIT      2000

LRESULT CALLBACK WndProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK MDIChildWndProc(HWND hwnd, UINT Message, WPARAM wParam,
   LPARAM lParam);

char g_szAppName[] = "MyMDIWindow";
char g_szChild[] = "MyMDIChild";
HINSTANCE g_hInst;
HWND g_hMDIClient, g_hStatusBar, g_hToolBar;
HWND g_hMainWindow;

BOOL LoadFile(HWND hEdit, LPSTR pszFileName)
{
   HANDLE hFile;
   BOOL bSuccess = FALSE;

   hFile = CreateFile(pszFileName, GENERIC_READ, FILE_SHARE_READ, NULL,
      OPEN_EXISTING, NULL, NULL);
   if(hFile != INVALID_HANDLE_VALUE)
   {
      DWORD dwFileSize;
      dwFileSize = GetFileSize(hFile, NULL);
      if(dwFileSize != 0xFFFFFFFF)
      {
         LPSTR pszFileText;
         pszFileText = LPSTR(GlobalAlloc(GPTR, dwFileSize + 1));
         if(pszFileText != NULL)
         {
            DWORD dwRead;
            if(ReadFile(hFile, pszFileText, dwFileSize, &dwRead, NULL))
            {
               pszFileText[dwFileSize] = 0; // Null terminator
               if(SetWindowText(hEdit, pszFileText))
                  bSuccess = TRUE; // It worked!
            }
            GlobalFree(pszFileText);
         }
      }
      CloseHandle(hFile);
   }
   return bSuccess;
}

BOOL SaveFile(HWND hEdit, LPSTR pszFileName)
{
   HANDLE hFile;
   BOOL bSuccess = FALSE;

   hFile = CreateFile(pszFileName, GENERIC_WRITE, NULL, NULL,
      CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
   if(hFile != INVALID_HANDLE_VALUE)
   {
      DWORD dwTextLength;
      dwTextLength = GetWindowTextLength(hEdit);
      if(dwTextLength > 0)// No need to bother if there's no text.
      {
         LPSTR pszText;
         pszText = LPSTR(GlobalAlloc(GPTR, dwTextLength + 1));
         if(pszText != NULL)
         {
            if(GetWindowText(hEdit, pszText, dwTextLength + 1))
            {
               DWORD dwWritten;
               if(WriteFile(hFile, pszText, dwTextLength, &dwWritten, NULL))
                  bSuccess = TRUE;
            }
            GlobalFree(pszText);
         }
      }
      CloseHandle(hFile);
   }
   return bSuccess;
}

BOOL GetFileName(HWND hwnd, LPSTR pszFileName, BOOL bSave)
{
   OPENFILENAME ofn;

   ZeroMemory(&ofn, sizeof(ofn));
   pszFileName[0] = 0;

   ofn.lStructSize = sizeof(ofn);
   ofn.hwndOwner = hwnd;
   ofn.lpstrFilter = "Text Files (*.txt)\0*.txt\0All Files (*.*)\0*.*\0\0";
   ofn.lpstrFile = pszFileName;
   ofn.nMaxFile = MAX_PATH;
   ofn.lpstrDefExt = "txt";

   if(bSave)
   {
      ofn.Flags = OFN_EXPLORER | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY |
         OFN_OVERWRITEPROMPT;
      if(!GetSaveFileName(&ofn))
         return FALSE;
   }
   else
   {
      ofn.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_HIDEREADONLY;
      if(!GetOpenFileName(&ofn))
         return FALSE;
   }
   return TRUE;
}

#pragma argsused
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
   LPSTR lpszCmdParam, int nCmdShow)
{
   MSG  Msg;
   WNDCLASSEX WndClassEx;

   InitCommonControls();

   g_hInst = hInstance;

   WndClassEx.cbSize          = sizeof(WNDCLASSEX);
   WndClassEx.style           = CS_HREDRAW | CS_VREDRAW;
   WndClassEx.lpfnWndProc     = WndProc;
   WndClassEx.cbClsExtra      = 0;
   WndClassEx.cbWndExtra      = 0;
   WndClassEx.hInstance       = hInstance;
   WndClassEx.hIcon           = LoadIcon(NULL, IDI_APPLICATION);
   WndClassEx.hCursor         = LoadCursor(NULL, IDC_ARROW);
   WndClassEx.hbrBackground   = (HBRUSH)(COLOR_3DSHADOW+1);
   WndClassEx.lpszMenuName       = "MAIN";
   WndClassEx.lpszClassName   = g_szAppName;
   WndClassEx.hIconSm           = LoadIcon(NULL, IDI_APPLICATION);

   if(!RegisterClassEx(&WndClassEx))
   {
      MessageBox(0, "Could Not Register Window", "Oh Oh...",
         MB_ICONEXCLAMATION | MB_OK);
      return -1;
   }

   WndClassEx.lpfnWndProc     = MDIChildWndProc;
   WndClassEx.lpszMenuName       = NULL;
   WndClassEx.lpszClassName   = g_szChild;
   WndClassEx.hbrBackground   = (HBRUSH)(COLOR_3DFACE+1);

   if(!RegisterClassEx(&WndClassEx))
   {
      MessageBox(0, "Could Not Register Child Window", "Oh Oh...",
         MB_ICONEXCLAMATION | MB_OK);
      return -1;
   }

    g_hMainWindow = CreateWindowEx(NULL, g_szAppName,
      "Text Editor", WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
      CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
      NULL, NULL, hInstance, NULL);

   if (g_hMainWindow == NULL){
      MessageBox(0, "No Window", "Oh Oh...", MB_ICONEXCLAMATION | MB_OK);
      return -1;
   }

   ShowWindow(g_hMainWindow, nCmdShow);
   UpdateWindow(g_hMainWindow);

   while(GetMessage(&Msg, NULL, 0, 0))
   {
      if (!TranslateMDISysAccel(g_hMDIClient, &Msg))
      {
         TranslateMessage(&Msg);
         DispatchMessage(&Msg);
      }
   }
   return Msg.wParam;
}


LRESULT CALLBACK WndProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
   switch(Message)
   {
      case WM_CREATE:
      {
         CLIENTCREATESTRUCT ccs;
         int iStatusWidths[] = {200, 300, -1};
         TBADDBITMAP tbab;
         TBBUTTON tbb[9];

         // Find window menu where children will be listed
         ccs.hWindowMenu  = GetSubMenu(GetMenu(hwnd), 2);
         ccs.idFirstChild = ID_MDI_FIRSTCHILD;
         g_hMDIClient = CreateWindowEx(WS_EX_CLIENTEDGE, "mdiclient", NULL,
            WS_CHILD | WS_CLIPCHILDREN | WS_VSCROLL | WS_HSCROLL,
            CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
            hwnd, (HMENU)ID_MDI_CLIENT, g_hInst, (LPVOID)&ccs);
         ShowWindow(g_hMDIClient, SW_SHOW);

         g_hStatusBar = CreateWindowEx(0, STATUSCLASSNAME, NULL,
            WS_CHILD | WS_VISIBLE | SBARS_SIZEGRIP, 0, 0, 0, 0,
            hwnd, (HMENU)ID_STATUSBAR, g_hInst, NULL);
         SendMessage(g_hStatusBar, SB_SETPARTS, 3, (LPARAM)iStatusWidths);
         SendMessage(g_hStatusBar, SB_SETTEXT, 2, (LPARAM)"Toolbar & Statusbar Example");

         g_hToolBar = CreateWindowEx(0, TOOLBARCLASSNAME, NULL,
            WS_CHILD | WS_VISIBLE, 0, 0, 0, 0,
            hwnd, (HMENU)ID_TOOLBAR, g_hInst, NULL);

         // Send the TB_BUTTONSTRUCTSIZE message, which is required for
         // backward compatibility.
         SendMessage(g_hToolBar, TB_BUTTONSTRUCTSIZE, (WPARAM)sizeof(TBBUTTON), 0);

         tbab.hInst = HINST_COMMCTRL;
         tbab.nID = IDB_STD_SMALL_COLOR;
         SendMessage(g_hToolBar, TB_ADDBITMAP, 0, (LPARAM)&tbab);

         ZeroMemory(tbb, sizeof(tbb));

         tbb[0].iBitmap = STD_FILENEW;
         tbb[0].fsState = TBSTATE_ENABLED;
         tbb[0].fsStyle = TBSTYLE_BUTTON;
         tbb[0].idCommand = CM_FILE_NEW;

         tbb[1].iBitmap = STD_FILEOPEN;
         tbb[1].fsState = TBSTATE_ENABLED;
         tbb[1].fsStyle = TBSTYLE_BUTTON;
         tbb[1].idCommand = CM_FILE_OPEN;

         tbb[2].iBitmap = STD_FILESAVE;
         tbb[2].fsStyle = TBSTYLE_BUTTON;
         tbb[2].idCommand = CM_FILE_SAVE;

         tbb[3].fsStyle = TBSTYLE_SEP;

         tbb[4].iBitmap = STD_CUT;
         tbb[4].fsStyle = TBSTYLE_BUTTON;
         tbb[4].idCommand = CM_EDIT_CUT;

         tbb[5].iBitmap = STD_COPY;
         tbb[5].fsStyle = TBSTYLE_BUTTON;
         tbb[5].idCommand = CM_EDIT_COPY;

         tbb[6].iBitmap = STD_PASTE;
         tbb[6].fsStyle = TBSTYLE_BUTTON;
         tbb[6].idCommand = CM_EDIT_PASTE;

         tbb[7].fsStyle = TBSTYLE_SEP;