Originally Posted by
B1ackAnge1
Why do you think most people when they have the option to use something else like MFC/.NET use that instead when it comes to writing windows apps?
Though you can do some pretty powerful things if you deal with it directly.
Just take baby-steps.. you'll get there
I need my baby booties... so I don't hurt myself. ;l
Anyway I started on chapter 3 of my book today and it was still frustrating, but I guess I knew how to handle it this time, even though it did get a little frustrating:
This is the code that came in the book:
Code:
// Beginning Game Programming
// Chapter 3
// WindowTest program
//header files to include
#include <windows.h>
#include <stdlib.h>
#include <time.h>
//application title
#define APPTITLE "Hello World"
//function prototypes (forward declarations)
BOOL InitInstance(HINSTANCE,int);
ATOM MyRegisterClass(HINSTANCE);
LRESULT CALLBACK WinProc(HWND,UINT,WPARAM,LPARAM);
//the window event callback function
LRESULT CALLBACK WinProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
char *szHello = "Hello World!";
RECT rt;
int x, y, n;
COLORREF c;
switch (message)
{
case WM_PAINT:
//get the dimensions of the window
Ge***ientRect(hWnd, &rt);
//start drawing on device context
hdc = BeginPaint(hWnd, &ps);
//draw some text
DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
//draw 1000 random pixels
for (n=0; n<3000; n++)
{
x = rand() % (rt.right - rt.left);
y = rand() % (rt.bottom - rt.top);
c = RGB(rand()%256, rand()%256, rand()%256);
SetPixel(hdc, x, y, c);
}
//stop drawing
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
}
return DefWindowProc(hWnd, message, wParam, lParam);
}
//helper function to set up the window properties
ATOM MyRegisterClass(HINSTANCE hInstance)
{
//create the window class structure
WNDCLASSEX wc;
wc.cbSize = sizeof(WNDCLASSEX);
//fill the struct with info
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = (WNDPROC)WinProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = NULL;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = APPTITLE;
wc.hIconSm = NULL;
//set up the window with the class info
return RegisterClassEx(&wc);
}
//helper function to create the window and refresh it
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
//create a new window
hWnd = CreateWindow(
APPTITLE, //window class
APPTITLE, //title bar
WS_OVERLAPPEDWINDOW, //window style
CW_USEDEFAULT, //x position of window
CW_USEDEFAULT, //y position of window
500, //width of the window
400, //height of the window
NULL, //parent window
NULL, //menu
hInstance, //application instance
NULL); //window parameters
//was there an error creating the window?
if (!hWnd)
return FALSE;
//display the window
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
//entry point for a Windows program
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
// declare variables
MSG msg;
// register the class
MyRegisterClass(hInstance);
// initialize application
if (!InitInstance (hInstance, nCmdShow))
return FALSE;
//set random number seed
srand(time(NULL));
// main message loop
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
And this is what I had to do to get it working:
Code:
// Beginning Game Programming
// Chapter 3
// WindowTest program
//header files to include
#include <windows.h>
#include <stdlib.h>
#include <time.h>
//application title
#define APPTITLE "Hello World"
//function prototypes (forward declarations)
BOOL InitInstance(HINSTANCE,int);
ATOM MyRegisterClass(HINSTANCE);
LRESULT CALLBACK WinProc(HWND,UINT,WPARAM,LPARAM);
//the window event callback function
LRESULT CALLBACK WinProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
char *szHello = "Hello World!";
RECT rt;
int x, y, n;
COLORREF c;
switch (message)
{
case WM_PAINT:
//get the dimensions of the window
Ge***ientRect(hWnd, &rt);
//start drawing on device context
hdc = BeginPaint(hWnd, &ps);
//draw some text
DrawTextA(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
//draw 1000 random pixels
for (n=0; n<3000; n++)
{
x = rand() % (rt.right - rt.left);
y = rand() % (rt.bottom - rt.top);
c = RGB(rand()%256, rand()%256, rand()%256);
SetPixel(hdc, x, y, c);
}
//stop drawing
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
}
return DefWindowProcA(hWnd, message, wParam, lParam);
}
//helper function to set up the window properties
ATOM MyRegisterClass(HINSTANCE hInstance)
{
//create the window class structure
WNDCLASSEXA wc;
wc.cbSize = sizeof(WNDCLASSEXA);
//fill the struct with info
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = (WNDPROC)WinProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = NULL;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = APPTITLE;
wc.hIconSm = NULL;
//set up the window with the class info
return RegisterClassExA(&wc);
}
//helper function to create the window and refresh it
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
//create a new window
hWnd = CreateWindowA(
APPTITLE, //window class
APPTITLE, //title bar
WS_OVERLAPPEDWINDOW, //window style
CW_USEDEFAULT, //x position of window
CW_USEDEFAULT, //y position of window
500, //width of the window
400, //height of the window
NULL, //parent window
NULL, //menu
hInstance, //application instance
NULL); //window parameters
//was there an error creating the window?
if (!hWnd)
return FALSE;
//display the window
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
//entry point for a Windows program
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
// declare variables
MSG msg;
// register the class
MyRegisterClass(hInstance);
// initialize application
if (!InitInstance (hInstance, nCmdShow))
return FALSE;
//set random number seed
srand(time(NULL));
// main message loop
while (GetMessageA(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessageA(&msg);
}
return msg.wParam;
}
I suppose it's not terrible, its just tough to grasp some of the big points or even completely understand what's going on when dealing when you have to deal with all these errors on top of first being exposed to Windows. Anyway I have found one function of Visual C++ very helpful. Right Click >> Look up Definition. Some of the definitions go all the way back to Windows NT, and I have no idea how they are defined really... as far as what kind of actual size in bytes certain variables are, and I have a feeling hardly anyone does o_O?!
