Hello. I, the C++ noob is back again... This time requiring some help with some visual CPP.
This is the first time im working with this, and its only @ a basic level. Yes, this is somehting im doing at university, but i dont ask for help unless im stuck and have tried my best.
The problem :
Implement a simple program to display a message and which allows the user to:
1 - Exit
2 - Change and select customer colours
3 - Change and select custom fonts
From this. i've completed 1 and 2. I am stuck on selecting fonts. My code isnt compliling and more and i cant understand the error i am getting.!
please can someone help....
// WinApp1.cpp : Defines the entry point for the application.
//
#include "stdafx.h"
#include "WinApp1.h"
#include "commdlg.h"
#define MAX_LOADSTRING 100
// Global Variables:
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name
HFONT g_hfFont;
/* additional global variables
*/
COLORREF rgbText = RGB(0, 0, 0); // the colour to draw the text
COLORREF rgbBackground = RGB(255, 255, 255); // the colour of the text backgrnd
COLORREF rgbCustom[16] = {0}; // an array of 16 'custom' colours
// Forward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);
int APIENTRY _tWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
// TODO: Place code here.
MSG msg;
HACCEL hAccelTable;
// Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_WINAPP1, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_WINAPP1));
// Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
// COMMENTS:
//
// This function and its usage are only necessary if you want this code
// to be compatible with Win32 systems prior to the 'RegisterClassEx'
// function that was added to Windows 95. It is important to call this function
// so that the application will get 'well formed' small icons associated
// with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WINAPP1));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = MAKEINTRESOURCE(IDC_WINAPP1);
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&wcex);
}
/* This is the method to display the colour chooser dialog
It should show the current colour and 'remember custom colours
*/
void DoSelectColour(HWND hwnd) {
/* CHOOSECOLOR is a struct that controls the appearance
and behaviour of the ChooseColor dialog
*/
CHOOSECOLOR cc = {sizeof(CHOOSECOLOR)};
cc.Flags = CC_RGBINIT | CC_FULLOPEN | CC_ANYCOLOR;
cc.hwndOwner = hwnd;
cc.rgbResult = rgbText; // this shows the current colour
cc.lpCustColors = rgbCustom; // the array of 'custom' colours
if(ChooseColor(&cc)) // displays the dialog - returns
// true on OK, false on Cancel
{
rgbText = cc.rgbResult;
}
}
void DoSelectFont(HWND hwnd) {
CHOOSEFONT cf = {sizeof(CHOOSEFONT)};
LOGFONT lf;
GetObject(g_hfFont, sizeof(LOGFONT), &lf);
cf.Flags = CF_EFFECTS | CF_INITTOLOGFONTSTRUCT |
CF_SCREENFONTS;
cf.hwndOwner = hwnd;
cf.lpLogFont = &lf;
cf.rgbColors = rgbText;
if(ChooseFont(&cf)) {
HFONT hf = CreateFontIndirect(&lf);
if(hf) {
g_hfFont = hf;
}
rgbText = cf.rgbColors; }
}
/* This is the method to draw the text on the window */
void DrawMessage(HDC hdc, RECT* prc){
SetBkColor(hdc, rgbBackground);
SetTextColor(hdc, rgbText);
char szMsg[] = "R Singh \nStudent ID: 123456";
/* we want to change the 'top' of the rectangle so that it
is half the original height.
*/
prc->top = (prc->bottom - prc->top) /2;
/* DrawText takes a number of parameters:
a handle to the display area to draw on
a pointer to the string to draw
the number of characters to draw (-1 if all)
a RECT struct to format the text into
format control
*/
DrawText(hdc, szMsg, -1, prc, DT_WORDBREAK | DT_CENTER);
/* We could arrange the vertical centering of the text
by using DT_SINGLELINE | DT_CENTER | DT_VCENTER
but this does not allow the word-wrap feature
*/
HFONT hfOld = SelectObject(hdc, g_hfFont);
SelectObject(hdc, hfOld);
}
//
// FUNCTION: InitInstance(HINSTANCE, int)
//
// PURPOSE: Saves instance handle and creates main window
//
// COMMENTS:
//
// In this function, we save the instance handle in a global variable and
// create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
hInst = hInstance; // Store instance handle in our global variable
hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
//
// FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND - process the application menu
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
HFONT hf;
long lfHeight;
hdc = GetDC(NULL);
lfHeight = -MulDiv(12, GetDeviceCaps(hdc,
LOGPIXELSY), 72);
ReleaseDC(NULL, hdc);
hf = CreateFont(lfHeight,0,0,0,0,TRUE,0,0,
0,0,0,0,0,"Times New Roman");
if(hf) {
DeleteObject(g_hfFont);
g_hfFont = hf;
}
else
{ MessageBox(hWnd, "Font creation failed!",
"Error", MB_OK | MB_ICONEXCLAMATION);
}
switch (message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
case ID_COLOUR_RED: // Colour Menu - Red
rgbText = RGB(255, 0, 0); // set the current colour
InvalidateRect(hWnd, NULL, TRUE); // force a repaint
UpdateWindow(hWnd);
break;
case ID_COLOUR_GREEN: // Colour Menu - Green
rgbText = RGB(0, 255, 0);
InvalidateRect(hWnd, NULL, TRUE);
UpdateWindow(hWnd);
break;
case ID_COLOUR_BLUE: // Colour Menu - Blue
rgbText = RGB(0, 0, 255);
InvalidateRect(hWnd, NULL, TRUE);
UpdateWindow(hWnd);
break;
case ID_COLOUR_SELECT: // Colour Menu - Select...
DoSelectColour(hWnd); // call our method
InvalidateRect(hWnd, NULL, TRUE); // force a repaint
UpdateWindow(hWnd);
break;
case ID_FONT_SELECT:
DoSelectFont(hWnd);
InvalidateRect(hWnd, NULL, TRUE); // force a repaint
UpdateWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// This is our code to call our DrawMessage method
RECT rcClient; // the DrawText function needs a client rectangle
GetClientRect(hWnd, &rcClient);
DrawMessage(hdc, &rcClient);
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}if i try to compile i get the error:
\winapp1.cpp(168) : error C2065: 'hf' : undeclared identifier
Any help / tips would be appreciated
