C++ Window

[Cam]

OK, so I found the following on the internet:


#include <windows.h>
#include <iostream>
using namespace std;
const char g_szClassName[] = "myWindowClass";

// Step 4: the Window Procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
   switch(msg)
   {
       case WM_CLOSE:
           DestroyWindow(hwnd);
       break;
       case WM_DESTROY:
           PostQuitMessage(0);
       break;
       default:
           return DefWindowProc(hwnd, msg, wParam, lParam);
   }
   return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
   LPSTR lpCmdLine, int nCmdShow)
{
   WNDCLASSEX wc;
   HWND hwnd;
   MSG Msg;

   //Step 1: Registering the Window Class
   wc.cbSize        = sizeof(WNDCLASSEX);
   wc.style         = 0;
   wc.lpfnWndProc   = WndProc;
   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_WINDOW+1);
   wc.lpszMenuName  = NULL;
   wc.lpszClassName = g_szClassName;
   wc.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);

   if(!RegisterClassEx(&wc))
   {
       MessageBox(NULL, "Window Registration Failed!", "Error!",
           MB_ICONEXCLAMATION | MB_OK);
       return 0;
   }

   // Step 2: Creating the Window
   hwnd = CreateWindowEx(
       WS_EX_CLIENTEDGE,
       g_szClassName,
       "The title of my window",
       WS_OVERLAPPEDWINDOW,
       CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,
       NULL, NULL, hInstance, NULL);
   if(hwnd == NULL)
   {
       MessageBox(NULL, "Window Creation Failed!", "Error!",
           MB_ICONEXCLAMATION | MB_OK);
       return 0;
   }

   ShowWindow(hwnd, nCmdShow);
   UpdateWindow(hwnd);

   // Step 3: The Message Loop
   while(GetMessage(&Msg, NULL, 0, 0) > 0)
   {
       TranslateMessage(&Msg);
       DispatchMessage(&Msg);
   }
   return Msg.wParam;
}



What I want to know is how in the world do I make a little message appear in the window!!

[Nick]

Hahaha! I knew that would be your delima. I only know Java so no idea!

[Cam]

Yeah, it's a bit confusing.

[Nick]

Maybe try

MessageBox()

[Jordan]

win32 isn't really my thing since I just use frameworks that do all of this stuff for you, but try this.

#include <windows.h>
#include <iostream>
using namespace std;
const char g_szClassName[] = "myWindowClass";

// Step 4: the Window Procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
HBRUSH NewBrush;

NewBrush = CreateSolidBrush(RGB(255, 0, 0));
char text[] = "Luke Mansell";

switch(msg)
{
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
SelectObject(hdc, NewBrush);
TextOut(hdc, 0, 0, text, strlen(text));
EndPaint(hwnd, &ps);
DeleteObject(NewBrush);
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
HWND hwnd;
MSG Msg;

//Step 1: Registering the Window Class
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = WndProc;
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_WINDOW+1);
wc.lpszMenuName = NULL;
wc.lpszClassName = g_szClassName;
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

if(!RegisterClassEx(&wc))
{
MessageBox(NULL, "Window Registration Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}

// Step 2: Creating the Window
hwnd = CreateWindowEx(
WS_EX_CLIENTEDGE,
g_szClassName,
"The title of my window",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,
NULL, NULL, hInstance, NULL);
if(hwnd == NULL)
{
MessageBox(NULL, "Window Creation Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}

ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);

// Step 3: The Message Loop
while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}

[Cam]

So the Luke Mansell is the text? I'll try it when I get on laptop, thanks! Do you have an easier way?

[Jordan]

May 27, 2011 22:50:56 GMT Cam said:

So the Luke Mansell is the text?

Yes

May 27, 2011 22:50:56 GMT Cam said:

Do you have an easier way?

Qt
wxWidgets
GTK
FLTK

[Cam]

Spat back an error.

[prads]

Post the error.
Or use CreateWindow (http://msdn.microsoft.com/en-us/library/ms632679(v=vs.85).aspx) and use "STATIC" as lpClassName. For instance, put this in WM_CREATE:

CreateWindow("STATIC", "Luke Mansell", WS_VISIBLE | WS_CHILD,
10, 10, 100, 20, hwnd, (HMENU)101, NULL, NULL);

[Cam]

I'll try that soon!

[Cam]

Jordan, I tried the Qt but didn't work

[Jordan]

There may be a few things that I may need to help you with, but it really does make making GUI's a piece of cake (simple one's, at least). Were you able to design the GUI, but when you tried to run the executable it didn't work? I'll need to know exactly what happened to give you a solution. I do know that getting text on the screen is as simple as dragging a "label" onto the gui and hitting build.

There's a guy that recently popped up on youtube that has some absolutely fantastic videos for Qt and C++ in general. Just start with the first Qt tutorial and he will explain how to get an executable running.

www.youtube.com/user/VoidRealms

[Cam]

It doesmt even open. D:

[Jordan]

What doesn't open? Your application when you try to run it, or the Qt Creator application (aka the IDE or text editor).