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Thread: how create a control?

  1. #1

    Thread Starter
    PowerPoster joaquim's Avatar
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    Apr 2007
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    how create a control?

    im build my own label class(using win32 API), but the label isn't showed...
    (in these case i'm using the console application... just for test and not re-create the window)
    label.h:
    Code:
    #include <windows.h>
    
    class label
    {
    private:
        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;
    }
    
    public:
    
        label(HWND value)
        {
    
        HWND hwnd;
        MSG Msg;
    
        hwnd = CreateWindowEx(
        WS_EX_CLIENTEDGE,
        "STATIC",
        "hello world",
        SS_LEFT|WS_CHILD|WS_VISIBLE,
        0, 0, 100, 100,
        value,
        NULL,
        GetModuleHandle(NULL),
         NULL);
    
         ShowWindow(hwnd,SW_SHOW);
        }
    };
    Code:
    #include "console.h"
    #include "variant.h"
    #include "label.h"
    
    
    int main()
    {
        label b(GetForegroundWindow());
    	return 0;
    }
    (in these case i'm not using the console and variant headers files)
    but i only need ask(for now): why the label isn't showed?
    the class is STATIC...
    VB6 2D Sprite control

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  2. #2

    Thread Starter
    PowerPoster joaquim's Avatar
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    Re: how create a control?

    my problem was be using console instead the GUID project.
    now i need connect the label with message loop:
    Code:
    SetWindowLongPtr(hwnd, GWL_WNDPROC, (LONG_PTR)WndProc);
    WndProc - is the message loop procedure.
    error message:
    "invalid use of member function (did you forget the '()' ?)"
    so tell me: what i'm doing wrong?
    VB6 2D Sprite control

    To live is difficult, but we do it.

  3. #3
    Fanatic Member AceInfinity's Avatar
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    May 2011
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    677

    Re: how create a control?

    Where is the message loop exactly? You need to first understand the event based model. There's tons wrong with this, although I can't help you with this based on my current understanding of your knowledge in C++. You're trying to advance too quickly; you can't become a C++ wizard within a short time. This is a language that takes time to digest, and if you don't understand message loops yet, how are you expecting yourself to write a label class?

    my problem was be using console instead the GUID project.
    This is not the problem at all, I can create a GUI with a console project no problem.

    It's good to be optimistic, and ambitious, but there are limitations to what you can expect from a programmer still learning the foundations of the language.. I suggest you start with more basic projects first. Post your implementation of a calculator for instance, and we'll see how you do. If you think a basic one is too easy, then try one which calculates in a stack based method using RPN notation, and if that's too easy, try creating one that converts from infix to RPN notation, and calculates the result with the 4 basic operations in math. If you're choosing the last one, I'll almost guarantee that you're shooting for the stars there; it won't be easy with the level you're at based on what I've seen, but the point is that you need to start someplace more appropriate.


    Cheers
    Last edited by AceInfinity; Dec 29th, 2013 at 03:11 PM.
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  4. #4

    Thread Starter
    PowerPoster joaquim's Avatar
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    Re: how create a control?

    Quote Originally Posted by AceInfinity View Post
    Where is the message loop exactly? There's tons wrong with this, although I can't help you with this based on my current understanding of your knowledge in C++. You're trying to advance too quickly; you can't become a C++ wizard within a short time. This is a language that takes time to digest, and if you don't understand message loops yet, how are you expecting yourself to write a label class?



    This is not the problem at all, I can create a GUI with a console project no problem.

    It's good to be optimistic, and ambitious, but there are limitations to what you can expect from a programmer still learning the foundations of the language..

    Cheers
    heres my entire class:
    Code:
    #include <windows.h>
    #include <iostream>
    #include <string>
    #include <process.h>
    
    using namespace std;
    HWND hwnd;
    HHOOK _hook;
    WNDPROC previous_boring_subclassed_edit_proc;
    
    //heres the window procedure
    LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
    {
        WNDPROC oldproc =(WNDPROC)GetWindowLongPtr(GetParent(hwnd),GWLP_USERDATA);
        UINT i=(UINT)GetWindowLongPtr(GetParent(hwnd),GWLP_USERDATA);
        switch(msg)
        {
            case WM_NCCREATE:
            {
                 CREATESTRUCT *createstruct = (CREATESTRUCT*)lParam;
    
                SetWindowLong(hwnd, GWL_USERDATA, (long)createstruct->lpCreateParams);
    
    
            }
            break;
            case WM_CREATE:
                SetWindowText(hwnd,"hi");
            break;
            case WM_MOUSEMOVE:
                SetWindowText(hwnd,"hello");
            break;
            case WM_CLOSE:
                DestroyWindow(hwnd);
            break;
            case WM_DESTROY:
                PostQuitMessage(0);
            break;
            default:
                return CallWindowProc(previous_boring_subclassed_edit_proc, hwnd, msg, wParam, lParam);
        }
        return 0;
    }
    
    class label
    {
    private:
    
    
    
    
    
    public:
    
        label(){};
        label(HWND value)
        {
    
            hwnd = CreateWindowEx(
                WS_EX_LEFT| WS_EX_LTRREADING | WS_EX_RIGHTSCROLLBAR,
                "STATIC",
                "",
                SS_LEFT|WS_CHILD|WS_VISIBLE,
                0, 0, 100, 100,
                value,
                NULL,
                GetModuleHandle(NULL),
                NULL);
    
                ShowWindow(hwnd,SW_SHOW);
                UpdateWindow(hwnd);
                previous_boring_subclassed_edit_proc = (WNDPROC)GetWindowLong(hwnd, GWL_WNDPROC);//get the default procedure
                SetWindowLong(hwnd, GWL_WNDPROC, (LONG_PTR)WndProc);//set your custom procedure :)
        }
    
        void setparent(HWND value)
        {
    
            hwnd = CreateWindowEx(
                WS_EX_LEFT| WS_EX_LTRREADING | WS_EX_RIGHTSCROLLBAR,
                "STATIC",
                "",
                SS_LEFT|WS_CHILD|WS_VISIBLE,
                0, 0, 100, 100,
                value,
                NULL,
                GetModuleHandle(NULL),
                NULL);
    
                ShowWindow(hwnd,SW_SHOW);
                UpdateWindow(hwnd);
                previous_boring_subclassed_edit_proc = (WNDPROC)GetWindowLong(hwnd, GWL_WNDPROC);//get the default procedure
                SetWindowLong(hwnd, GWL_WNDPROC, (LONG_PTR)WndProc);//set your custom procedure :)
        }
    
        COORD GetSize()
        {
            RECT LabelSize;
            GetWindowRect(hwnd,&LabelSize);
            COORD crdSize={LabelSize.right-LabelSize.left,LabelSize.bottom-LabelSize.top};
            return crdSize;
        }
    
        void SetText(string text)
        {
            char* chrText=(char*)text.c_str();
            SetWindowText(hwnd, chrText);
        }
    
    
    };
    heres the main.cpp:
    Code:
    #include <windows.h>
    #include "Label.h"
    
    using namespace std;
    
    label test;
    /*  Declare Windows procedure  */
    LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
    
    /*  Make the class name into a global variable  */
    char szClassName[] = "CodeBlocksWindowsApp";
    
    //creating the window
    int WINAPI WinMain (HINSTANCE hThisInstance, HINSTANCE, LPSTR lpszArgument, int nCmdShow)
    {
    HWND hwnd;               /* This is the handle for our window */
    MSG messages;            /* Here messages to the application are saved */
    WNDCLASSEX wincl;        /* Data structure for the windowclass */
    
    
        /* The Window structure */
        wincl.hInstance = hThisInstance;
        wincl.lpszClassName = szClassName;
        wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
        wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
        wincl.cbSize = sizeof (WNDCLASSEX);
    
        /* Use default icon and mouse-pointer */
        wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
        wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
        wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
        wincl.lpszMenuName = NULL;                 /* No menu */
        wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
        wincl.cbWndExtra = 0;                      /* structure or the window instance */
        /* Use Windows's default colour as the background of the window */
        wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
    
        /* Register the window class, and if it fails quit the program */
        if (!RegisterClassEx (&wincl))
            return 0;
    
        /* The class is registered, let's create the program*/
        hwnd = CreateWindowEx (
               0,                   /* Extended possibilites for variation */
               szClassName,         /* Classname */
               "Code::Blocks Template Windows App",       /* Title Text */
               WS_OVERLAPPEDWINDOW, /* default window */
               CW_USEDEFAULT,       /* Windows decides the position */
               CW_USEDEFAULT,       /* where the window ends up on the screen */
               544,                 /* The programs width */
               375,                 /* and height in pixels */
               HWND_DESKTOP,        /* The window is a child-window to desktop */
               NULL,                /* No menu */
               hThisInstance,       /* Program Instance handler */
               NULL                 /* No Window Creation data */
               );
    
        /* Make the window visible on the screen */
        ShowWindow (hwnd, nCmdShow);
    	UpdateWindow(hwnd);
    
        label label1(hwnd);
    	//label1.SetText("oi");
    
        /* Run the message loop. It will run until GetMessage() returns 0 */
        while (GetMessage (&messages, NULL, 0, 0))
        {
            /* Translate virtual-key messages into character messages */
            TranslateMessage(&messages);
            /* Send message to WindowProcedure */
            DispatchMessage(&messages);
        }
    
        /* The program return-value is 0 - The value that PostQuitMessage() gave */
        return messages.wParam;
    }
    
    
    /*  This function is called by the Windows function DispatchMessage()  */
    LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
    {
        switch (message)                  /* handle the messages */
        {
            case WM_CREATE:
                test.setparent(hwnd);
                test.SetText("hello");
    
                break;
    
            case WM_DESTROY:
                PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
                break;
    
            default:                      /* for messages that we don't deal with */
                return DefWindowProc (hwnd, message, wParam, lParam);
        }
    
        return 0;
    }
    seems that i must connet my window procedure(the control procedure) to the form\window procedure for i get the messages correctly.
    the createwindowex() creates the STATIC control, now i must connect it to window procedure.. but i don't know how
    i tryied use the SetWindowLog()(like VB6), but isn't working
    VB6 2D Sprite control

    To live is difficult, but we do it.

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