Hi everyone, I am beginning to find the later chapters of the book understandable. My problem now is this , When I compile the following code, the MDI child would not be created .. why?
Please,any help with this and my other post on my edit control would be appreciated!!
#include<windows.h>
#include<cstdlib>
#include<cstring>
#include<tchar.h>
#include<commctrl.h>
#include"resource.h"
#pragma comment(lib,"comctl32.lib")
static TCHAR g_szClassName[] = _T("myWindowClass");
static TCHAR g_szChildClassName[] = _T("myMDIChildWindowClass");
static TCHAR g_szWindowName[] = _T("MyWindowName");
#define IDC_MAIN_MDI 101
#define IDC_MAIN_TOOL 102
#define IDC_MAIN_STATUS 103
#define IDC_CHILD_EDIT 101
#define ID_MDI_FIRSTCHILD 50000
HWND g_hMDIClient = NULL;
HWND g_hMainWindow = NULL;
BOOL LoadTextFileToEdit(HWND hEdit, LPCTSTR pszFileName)
{
HANDLE hFile;
BOOL bSuccess = FALSE;
hFile = CreateFile(pszFileName, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, 0, 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; // Add null terminator
if(SetWindowText(hEdit, (LPCWSTR)pszFileText))
bSuccess = TRUE; // It worked!
}
GlobalFree(pszFileText);
}
}
CloseHandle(hFile);
}
return bSuccess;
}
BOOL SaveTextFileFromEdit(HWND hEdit, LPCTSTR pszFileName)
{
HANDLE hFile;
BOOL bSuccess = FALSE;
hFile = CreateFile(pszFileName, GENERIC_WRITE, 0, NULL,
CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if(hFile != INVALID_HANDLE_VALUE)
{
DWORD dwTextLength;
dwTextLength = GetWindowTextLength(hEdit);
// No need to bother if there's no text.
if(dwTextLength > 0)
{
LPSTR pszText;
DWORD dwBufferSize = dwTextLength + 1;
pszText = (LPSTR)GlobalAlloc(GPTR, dwBufferSize);
if(pszText != NULL)
{
if(GetWindowText(hEdit, (LPWSTR)pszText, dwBufferSize))
{
DWORD dwWritten;
if(WriteFile(hFile, pszText, dwTextLength, &dwWritten, NULL))
bSuccess = TRUE;
}
GlobalFree(pszText);
}
}
CloseHandle(hFile);
}
return bSuccess;
}
void DoFileOpen(HWND hwnd)
{
OPENFILENAME ofn;
wchar_t szFileName[MAX_PATH] = _T("");
ZeroMemory(&ofn, sizeof(ofn));
ofn.lStructSize = sizeof(ofn);
ofn.hwndOwner = hwnd;
ofn.lpstrFilter = _T("Text Files (*.txt)\0*.txt\0All Files (*.*)\0*.*\0");
ofn.lpstrFile = szFileName;
ofn.nMaxFile = MAX_PATH;
ofn.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_HIDEREADONLY;
ofn.lpstrDefExt = _T("txt");
if(GetOpenFileName(&ofn))
{
HWND hEdit = GetDlgItem(hwnd, IDC_CHILD_EDIT);
if(LoadTextFileToEdit(hEdit, (LPCTSTR)szFileName))
{
SendDlgItemMessage(g_hMainWindow, IDC_MAIN_STATUS, SB_SETTEXT, 0, (LPARAM)"Opened...");
SendDlgItemMessage(g_hMainWindow, IDC_MAIN_STATUS, SB_SETTEXT, 1, (LPARAM)szFileName);
SetWindowText(hwnd, (LPCWSTR)szFileName);
}
}
}
void DoFileSave(HWND hwnd)
{
OPENFILENAME ofn;
const char szFileName[MAX_PATH] = "";
ZeroMemory(&ofn, sizeof(ofn));
ofn.lStructSize = sizeof(ofn);
ofn.hwndOwner = hwnd;
ofn.lpstrFilter = _T("Text Files (*.txt)\0*.txt\0All Files (*.*)\0*.*\0");
ofn.lpstrFile = (LPWSTR)szFileName;
ofn.nMaxFile = MAX_PATH;
ofn.lpstrDefExt = _T("txt");
ofn.Flags = OFN_EXPLORER | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT;
if(GetSaveFileName(&ofn))
{
HWND hEdit = GetDlgItem(hwnd, IDC_CHILD_EDIT);
if(SaveTextFileFromEdit(hEdit, (LPCTSTR)szFileName))
{
SendDlgItemMessage(g_hMainWindow, IDC_MAIN_STATUS, SB_SETTEXT, 0, (LPARAM)"Saved...");
SendDlgItemMessage(g_hMainWindow, IDC_MAIN_STATUS, SB_SETTEXT, 1, (LPARAM)szFileName);
SetWindowText(hwnd, (LPCWSTR)szFileName);
}
}
}
HWND CreateNewMDIChild(HWND hMDIClient)
{
MDICREATESTRUCT mcs;
HWND hChild;
mcs.szTitle = _T("Untitled");
mcs.szClass = _T("MDI class");
mcs.hOwner = GetModuleHandle(NULL);
mcs.x = mcs.cx = CW_USEDEFAULT;
mcs.y = mcs.cy = CW_USEDEFAULT;
mcs.style = MDIS_ALLCHILDSTYLES;
hChild = (HWND)SendMessage(hMDIClient, WM_MDICREATE, 0, (LONG)&mcs);
if(!hChild)
{
MessageBox(hMDIClient, _T("MDI Child creation failed."), _T("Oh Oh..."),
MB_ICONEXCLAMATION | MB_OK);
}
return hChild;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CREATE:
{
HWND hTool;
TBBUTTON tbb[3];
TBADDBITMAP tbab;
HWND hStatus;
int statwidths[] = {100, -1};
CLIENTCREATESTRUCT ccs;
// Create MDI Client
// 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, _T("MDICLIENT"), NULL,
WS_CHILD | WS_CLIPCHILDREN | WS_VSCROLL | WS_HSCROLL | WS_VISIBLE,
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
hwnd, (HMENU)IDC_MAIN_MDI, GetModuleHandle(NULL), (LPVOID)&ccs);
if(g_hMDIClient == NULL)
MessageBox(NULL, _T("Could not create MDI client."), _T("Error"), MB_OK | MB_ICONERROR);
// Create Toolbar
hTool = CreateWindowEx(0, TOOLBARCLASSNAME, NULL, WS_CHILD | WS_VISIBLE, 0, 0, 0, 0,
hwnd, (HMENU)IDC_MAIN_TOOL, GetModuleHandle(NULL), NULL);
if(hTool == NULL)
MessageBox(hwnd, _T("Could not create tool bar."), _T("Error"), MB_OK | MB_ICONERROR);
// Send the TB_BUTTONSTRUCTSIZE message, which is required for
// backward compatibility.
SendMessage(hTool, TB_BUTTONSTRUCTSIZE, (WPARAM)sizeof(TBBUTTON), 0);
tbab.hInst = HINST_COMMCTRL;
tbab.nID = IDB_STD_SMALL_COLOR;
SendMessage(hTool, 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 = ID_FILE_NEW;
tbb[1].iBitmap = STD_FILEOPEN;
tbb[1].fsState = TBSTATE_ENABLED;
tbb[1].fsStyle = TBSTYLE_BUTTON;
tbb[1].idCommand = ID_FILE_OPEN;
tbb[2].iBitmap = STD_FILESAVE;
tbb[2].fsState = TBSTATE_ENABLED;
tbb[2].fsStyle = TBSTYLE_BUTTON;
tbb[2].idCommand = ID_FILE_SAVEAS;
SendMessage(hTool, TB_ADDBUTTONS, sizeof(tbb)/sizeof(TBBUTTON), (LPARAM)&tbb);
// Create Status bar
hStatus = CreateWindowEx(0, STATUSCLASSNAME, NULL,
WS_CHILD | WS_VISIBLE | SBARS_SIZEGRIP, 0, 0, 0, 0,
hwnd, (HMENU)IDC_MAIN_STATUS, GetModuleHandle(NULL), NULL);
SendMessage(hStatus, SB_SETPARTS, sizeof(statwidths)/sizeof(int), (LPARAM)statwidths);
SendMessage(hStatus, SB_SETTEXT, 0, (LPARAM)"Feel Tkud :)");
}
break;
case WM_SIZE:
{
HWND hTool;
RECT rcTool;
int iToolHeight;
HWND hStatus;
RECT rcStatus;
int iStatusHeight;
HWND hMDI;
int iMDIHeight;
RECT rcClient;
// Size toolbar and get height
hTool = GetDlgItem(hwnd, IDC_MAIN_TOOL);
SendMessage(hTool, TB_AUTOSIZE, 0, 0);
GetWindowRect(hTool, &rcTool);
iToolHeight = rcTool.bottom - rcTool.top;
// Size status bar and get height
hStatus = GetDlgItem(hwnd, IDC_MAIN_STATUS);
SendMessage(hStatus, WM_SIZE, 0, 0);
GetWindowRect(hStatus, &rcStatus);
iStatusHeight = rcStatus.bottom - rcStatus.top;
// Calculate remaining height and size edit
GetClientRect(hwnd, &rcClient);
iMDIHeight = rcClient.bottom - iToolHeight - iStatusHeight;
hMDI = GetDlgItem(hwnd, IDC_MAIN_MDI);
SetWindowPos(hMDI, NULL, 0, iToolHeight, rcClient.right, iMDIHeight, SWP_NOZORDER);
}
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case ID_FILE_EXIT:
PostMessage(hwnd, WM_CLOSE, 0, 0);
break;
case ID_FILE_NEW:
CreateNewMDIChild(g_hMDIClient);
break;
case ID_FILE_OPEN:
{
HWND hChild = CreateNewMDIChild(g_hMDIClient);
if(hChild)
{
DoFileOpen(hChild);
}
}
break;
case ID_FILE_CLOSE:
{
HWND hChild = (HWND)SendMessage(g_hMDIClient, WM_MDIGETACTIVE,0,0);
if(hChild)
{
SendMessage(hChild, WM_CLOSE, 0, 0);
}
}
break;
case ID_WINDOW_TILE:
SendMessage(g_hMDIClient, WM_MDITILE, 0, 0);
break;
case ID_WINDOW_CASCADE:
SendMessage(g_hMDIClient, WM_MDICASCADE, 0, 0);
break;
default:
{
if(LOWORD(wParam) >= ID_MDI_FIRSTCHILD)
{
DefFrameProc(hwnd, g_hMDIClient, WM_COMMAND, wParam, lParam);
}
else
{
HWND hChild = (HWND)SendMessage(g_hMDIClient, WM_MDIGETACTIVE,0,0);
if(hChild)
{
SendMessage(hChild, WM_COMMAND, wParam, lParam);
}
}
}
}
break;
default:
return DefFrameProc(hwnd, g_hMDIClient, msg, wParam, lParam);
}
return 0;
}
LRESULT CALLBACK MDIChildWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CREATE:
{
HFONT hfDefault;
HWND hEdit;
// Create Edit Control
hEdit = CreateWindowEx(WS_EX_CLIENTEDGE, _T("EDIT"), _T(""),
WS_CHILD | WS_VISIBLE | WS_VSCROLL | WS_HSCROLL | ES_MULTILINE | ES_AUTOVSCROLL | ES_AUTOHSCROLL,
0, 0, 100, 100, hwnd, (HMENU)IDC_CHILD_EDIT, GetModuleHandle(NULL), NULL);
if(hEdit == NULL)
MessageBox(hwnd, _T("Could not create edit box."), _T("Error"), MB_OK | MB_ICONERROR);
hfDefault = (HFONT)GetStockObject(DEFAULT_GUI_FONT);
SendMessage(hEdit, WM_SETFONT, (WPARAM)hfDefault, MAKELPARAM(FALSE, 0));
}
break;
case WM_MDIACTIVATE:
{
HMENU hMenu, hFileMenu;
UINT EnableFlag;
hMenu = GetMenu(g_hMainWindow);
if(hwnd == (HWND)lParam)
{ //being activated, enable the menus
EnableFlag = MF_ENABLED;
}
else
{ //being de-activated, gray the menus
EnableFlag = MF_GRAYED;
}
EnableMenuItem(hMenu, 1, MF_BYPOSITION | EnableFlag);
EnableMenuItem(hMenu, 2, MF_BYPOSITION | EnableFlag);
hFileMenu = GetSubMenu(hMenu, 0);
EnableMenuItem(hFileMenu, ID_FILE_SAVEAS, MF_BYCOMMAND | EnableFlag);
EnableMenuItem(hFileMenu, ID_FILE_CLOSE, MF_BYCOMMAND | EnableFlag);
EnableMenuItem(hFileMenu, ID_FILE_CLOSEALL, MF_BYCOMMAND | EnableFlag);
DrawMenuBar(g_hMainWindow);
}
break;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case ID_FILE_OPEN:
DoFileOpen(hwnd);
break;
case ID_FILE_SAVEAS:
DoFileSave(hwnd);
break;
case ID_EDIT_CUT:
SendDlgItemMessage(hwnd, IDC_CHILD_EDIT, WM_CUT, 0, 0);
break;
case ID_EDIT_COPY:
SendDlgItemMessage(hwnd, IDC_CHILD_EDIT, WM_COPY, 0, 0);
break;
case ID_EDIT_PASTE:
SendDlgItemMessage(hwnd, IDC_CHILD_EDIT, WM_PASTE, 0, 0);
break;
}
break;
case WM_SIZE:
{
HWND hEdit;
RECT rcClient;
// Calculate remaining height and size edit
GetClientRect(hwnd, &rcClient);
hEdit = GetDlgItem(hwnd, IDC_CHILD_EDIT);
SetWindowPos(hEdit, NULL, 0, 0, rcClient.right, rcClient.bottom, SWP_NOZORDER);
}
return DefMDIChildProc(hwnd, msg, wParam, lParam);
default:
return DefMDIChildProc(hwnd, msg, wParam, lParam);
}
return 0;
}
BOOL SetUpMDIChildWindowClass(HINSTANCE hInstance)
{
WNDCLASSEX wc;
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = MDIChildWndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_3DFACE+1);
wc.lpszMenuName = NULL;
wc.lpszClassName = g_szChildClassName;
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
if(!RegisterClassEx(&wc))
{
MessageBox(0, _T("Could Not Register Child Window"), _T("Oh Oh..."),
MB_ICONEXCLAMATION | MB_OK);
return FALSE;
}
else
return TRUE;
}
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow){
MSG msg;
HWND hwnd;
WNDCLASSEX wcex;
InitCommonControls();
wcex.cbClsExtra=0;
wcex.cbSize=sizeof(WNDCLASSEX);
wcex.cbWndExtra=0;
wcex.hbrBackground=(HBRUSH)(COLOR_WINDOW + 1);
wcex.hCursor=LoadCursor(NULL,IDC_ARROW);
wcex.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wcex.hIconSm=LoadIcon(NULL,IDI_APPLICATION);
wcex.hInstance=GetModuleHandle(NULL);
wcex.lpfnWndProc=WndProc;
wcex.lpszClassName=g_szClassName;
wcex.lpszMenuName=MAKEINTRESOURCE(IDR_MAINMENU);
wcex.style=0;
if(!RegisterClassEx(&wcex)){
MessageBox(NULL,_T("Unable to register your class"),_T("Error"),MB_OK|MB_ICONERROR);
}
hwnd=CreateWindowEx(WS_EX_CLIENTEDGE,g_szClassName,g_szWindowName,WS_OVERLAPPEDWINDOW|WS_CLIPCHILDREN,
CW_USEDEFAULT,CW_USEDEFAULT,500,500,NULL,NULL,hInstance,NULL);
if(hwnd == NULL)
{
MessageBox(NULL, _T("Window Creation Failed!"), _T("Error!"),
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
g_hMainWindow = hwnd;
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&msg, NULL, 0, 0) > 0)
{
if (!TranslateMDISysAccel(g_hMDIClient, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return msg.wParam;
}Is it because I am saving my code as .cpp?