windows api help

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windows api help

 
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  #1
Sep 17th, 2007
How can I make this print the text in the edit box when you push the button instead of "You pushed a button." I have looked all over but I can't figure it out.
C++ Syntax (Toggle Plain Text) 
  1. #include <windows.h>
  2. #include "resource.h"
  3. HWND hWndButton;
  4. HWND hWndEditBox;
  5. HFONT hFont;
  6.  
  7. /*  Declare Windows procedure  */
  8. LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
  9.  
  10. /*  Make the class name into a global variable  */
  11. char szClassName[ ] = "WindowsApp";
  12.  
  13. int WINAPI WinMain (HINSTANCE hThisInstance,
  14.                     HINSTANCE hPrevInstance,
  15.                     LPSTR lpszArgument,
  16.                     int nFunsterStil)
  17.  
  18. {
  19.     HWND hWnd;               /* This is the handle for our window */
  20.     MSG messages;            /* Here messages to the application are saved */
  21.     WNDCLASSEX wincl;        /* Data structure for the windowclass */
  22.  
  23.     /* The Window structure */
  24.     wincl.hInstance = hThisInstance;
  25.     wincl.lpszClassName = szClassName;
  26.     wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
  27.     wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
  28.     wincl.cbSize = sizeof (WNDCLASSEX);
  29.  
  30.     /* Use default icon and mouse-pointer */
  31.     wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
  32.     wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
  33.     wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
  34.     wincl.lpszMenuName = NULL;                 /* No menu */
  35.     wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
  36.     wincl.cbWndExtra = 0;                      /* structure or the window instance */
  37.     /* Use Windows's default color as the background of the window */
  38.     wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
  39.  
  40.     /* Register the window class, and if it fails quit the program */
  41.     if (!RegisterClassEx (&wincl))
  42.         return 0;
  43.  
  44.     /* The class is registered, let's create the program*/
  45.     hWnd = CreateWindowEx (
  46.            0,                   /* Extended possibilites for variation */
  47.            szClassName,         /* Classname */
  48.            "Windows App",       /* Title Text */
  49.            WS_SYSMENU | WS_MINIMIZEBOX , /* default window */
  50.            CW_USEDEFAULT,       /* Windows decides the position */
  51.            CW_USEDEFAULT,       /* where the window ends up on the screen */
  52.            330,                 /* The programs width */
  53.            210,                 /* and height in pixels */
  54.            HWND_DESKTOP,        /* The window is a child-window to desktop */
  55.            NULL,                /* No menu */
  56.            hThisInstance,       /* Program Instance handler */
  57.            NULL                 /* No Window Creation data */
  58.            );
  59.  
  60.     /* Make the window visible on the screen */
  61.     ShowWindow (hWnd, nFunsterStil);
  62.  
  63.     /* Run the message loop. It will run until GetMessage() returns 0 */
  64.     while (GetMessage (&messages, NULL, 0, 0))
  65.     {
  66.         /* Translate virtual-key messages into character messages */
  67.         TranslateMessage(&messages);
  68.         /* Send message to WindowProcedure */
  69.         DispatchMessage(&messages);
  70.     }
  71.  
  72.     /* The program return-value is 0 - The value that PostQuitMessage() gave */
  73.     return messages.wParam;
  74. }
  75.  
  76.  
  77. /*  This function is called by the Windows function DispatchMessage()  */
  78.  
  79. LRESULT CALLBACK WindowProcedure (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
  80. {
  81.     switch (message)                  /* handle the messages */
  82.     {
  83.         case WM_CREATE:
  84.              {
  85.              HINSTANCE hInstance = (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE) ;
  86.             hWndButton = CreateWindowEx(
  87.             0,
  88.             "BUTTON",
  89.             "ADD",
  90.             WS_VISIBLE | WS_CHILD,
  91.             250,
  92.             0,
  93.             80,
  94.             20,
  95.             hWnd,
  96.             (HMENU) IDB_BUTTON,
  97.             hInstance,
  98.             NULL);
  99.              hFont = CreateFont(0, 0, 0, 0, 0, FALSE, FALSE, FALSE, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, FF_MODERN, "Courier New");
  100.              hWndEditBox = CreateWindow(
  101.             "EDIT", 
  102.             "", 
  103.             WS_VISIBLE | WS_CHILD | ES_AUTOHSCROLL,
  104.             0, 
  105.             0, 
  106.             250, 
  107.             20, 
  108.             hWnd, 
  109.             (HMENU)IDC_EDITBOX_TEXT, 
  110.             (HINSTANCE)GetWindowLong(hWnd, GWL_HINSTANCE), 
  111.             NULL);
  112.             SendMessage(hWndEditBox, WM_SETFONT, (WPARAM)hFont, TRUE);
  113.  
  114.  
  115.  
  116.  
  117.  
  118.  
  119.              }
  120.  
  121.              break;
  122.         case WM_DESTROY:
  123.  
  124.             PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
  125.             break;
  126.             case WM_COMMAND: 
  127.         {
  128.             switch (LOWORD(wParam))
  129.             {
  130.                 case IDB_BUTTON:
  131.                 {
  132.                     switch (HIWORD(wParam))
  133.                     {
  134.                         case BN_CLICKED:
  135.  
  136.  
  137.                             MessageBox(NULL, "You pushed a button.", "", MB_OK | MB_ICONINFORMATION);
  138.                         break; 
  139.                     }
  140.                 }
  141.                 break;
  142.             }
  143.             return 0;
  144.         } 
  145.         break; 
  146.         default:                      /* for messages that we don't deal with */
  147.             return DefWindowProc (hWnd, message, wParam, lParam);
  148.  
  149.     }
  150.  
  151.     return 0;
  152. }
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Re: windows api help

 
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  #2
Sep 17th, 2007
If you look at line 137 it calles the MessageBox function which takes the arguments
MessageBox(<message to show>, <title>, <buttons to show>, <icon to show>)

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Originally Posted by curt22 View Post
How can I make this print the text in the edit box when you push the button instead of "You pushed a button." I have looked all over but I can't figure it out.
c++ Syntax (Toggle Plain Text) 
  1. #include <windows.h>
  2. #include "resource.h"
  3. HWND hWndButton;
  4. HWND hWndEditBox;
  5. HFONT hFont;
  6.  
  7. /*  Declare Windows procedure  */
  8. LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
  9.  
  10. /*  Make the class name into a global variable  */
  11. char szClassName[ ] = "WindowsApp";
  12.  
  13. int WINAPI WinMain (HINSTANCE hThisInstance,
  14.                     HINSTANCE hPrevInstance,
  15.                     LPSTR lpszArgument,
  16.                     int nFunsterStil)
  17.  
  18. {
  19.     HWND hWnd;               /* This is the handle for our window */
  20.     MSG messages;            /* Here messages to the application are saved */
  21.     WNDCLASSEX wincl;        /* Data structure for the windowclass */
  22.  
  23.     /* The Window structure */
  24.     wincl.hInstance = hThisInstance;
  25.     wincl.lpszClassName = szClassName;
  26.     wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
  27.     wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
  28.     wincl.cbSize = sizeof (WNDCLASSEX);
  29.  
  30.     /* Use default icon and mouse-pointer */
  31.     wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
  32.     wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
  33.     wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
  34.     wincl.lpszMenuName = NULL;                 /* No menu */
  35.     wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
  36.     wincl.cbWndExtra = 0;                      /* structure or the window instance */
  37.     /* Use Windows's default color as the background of the window */
  38.     wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
  39.  
  40.     /* Register the window class, and if it fails quit the program */
  41.     if (!RegisterClassEx (&wincl))
  42.         return 0;
  43.  
  44.     /* The class is registered, let's create the program*/
  45.     hWnd = CreateWindowEx (
  46.            0,                   /* Extended possibilites for variation */
  47.            szClassName,         /* Classname */
  48.            "Windows App",       /* Title Text */
  49.            WS_SYSMENU | WS_MINIMIZEBOX , /* default window */
  50.            CW_USEDEFAULT,       /* Windows decides the position */
  51.            CW_USEDEFAULT,       /* where the window ends up on the screen */
  52.            330,                 /* The programs width */
  53.            210,                 /* and height in pixels */
  54.            HWND_DESKTOP,        /* The window is a child-window to desktop */
  55.            NULL,                /* No menu */
  56.            hThisInstance,       /* Program Instance handler */
  57.            NULL                 /* No Window Creation data */
  58.            );
  59.  
  60.     /* Make the window visible on the screen */
  61.     ShowWindow (hWnd, nFunsterStil);
  62.  
  63.     /* Run the message loop. It will run until GetMessage() returns 0 */
  64.     while (GetMessage (&messages, NULL, 0, 0))
  65.     {
  66.         /* Translate virtual-key messages into character messages */
  67.         TranslateMessage(&messages);
  68.         /* Send message to WindowProcedure */
  69.         DispatchMessage(&messages);
  70.     }
  71.  
  72.     /* The program return-value is 0 - The value that PostQuitMessage() gave */
  73.     return messages.wParam;
  74. }
  75.  
  76.  
  77. /*  This function is called by the Windows function DispatchMessage()  */
  78.  
  79. LRESULT CALLBACK WindowProcedure (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
  80. {
  81.     switch (message)                  /* handle the messages */
  82.     {
  83.         case WM_CREATE:
  84.              {
  85.              HINSTANCE hInstance = (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE) ;
  86.             hWndButton = CreateWindowEx(
  87.             0,
  88.             "BUTTON",
  89.             "ADD",
  90.             WS_VISIBLE | WS_CHILD,
  91.             250,
  92.             0,
  93.             80,
  94.             20,
  95.             hWnd,
  96.             (HMENU) IDB_BUTTON,
  97.             hInstance,
  98.             NULL);
  99.              hFont = CreateFont(0, 0, 0, 0, 0, FALSE, FALSE, FALSE, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, FF_MODERN, "Courier New");
  100.              hWndEditBox = CreateWindow(
  101.             "EDIT", 
  102.             "", 
  103.             WS_VISIBLE | WS_CHILD | ES_AUTOHSCROLL,
  104.             0, 
  105.             0, 
  106.             250, 
  107.             20, 
  108.             hWnd, 
  109.             (HMENU)IDC_EDITBOX_TEXT, 
  110.             (HINSTANCE)GetWindowLong(hWnd, GWL_HINSTANCE), 
  111.             NULL);
  112.             SendMessage(hWndEditBox, WM_SETFONT, (WPARAM)hFont, TRUE);
  113.  
  114.  
  115.  
  116.  
  117.  
  118.  
  119.              }
  120.  
  121.              break;
  122.         case WM_DESTROY:
  123.  
  124.             PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
  125.             break;
  126.             case WM_COMMAND: 
  127.         {
  128.             switch (LOWORD(wParam))
  129.             {
  130.                 case IDB_BUTTON:
  131.                 {
  132.                     switch (HIWORD(wParam))
  133.                     {
  134.                         case BN_CLICKED:
  135.  
  136.  
  137.                             MessageBox(NULL, "You pushed a button.", "", MB_OK | MB_ICONINFORMATION);
  138.                         break; 
  139.                     }
  140.                 }
  141.                 break;
  142.             }
  143.             return 0;
  144.         } 
  145.         break; 
  146.         default:                      /* for messages that we don't deal with */
  147.             return DefWindowProc (hWnd, message, wParam, lParam);
  148.  
  149.     }
  150.  
  151.     return 0;
  152. }
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Re: windows api help

 
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  #3
Sep 17th, 2007
C++ Syntax (Toggle Plain Text) 
  1. int TxtSize = GetWindowTextLenth (hwndEditBox) + 1;
  2. char *Entry = new char [TxtSize];
  3. GetWindowText (hwndEditBox, Entry, TxtSize);
  4. MessageBox (NULL, Entry, "", MB_OK | MB_ICONINFORMATION)
  5. delete Entry [];
I'm pretty rusty at C++, so note useage of NEW & DELETE
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Re: windows api help

 
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  #4
Sep 17th, 2007
line 5 should be delete[] Entry
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
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Re: windows api help

 
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  #5
Sep 18th, 2007
Thanks I got it working using this code:
C++ Syntax (Toggle Plain Text) 
  1. int TxtSize = GetWindowTextLength (hWndEditBox) + 1;
  2. char *Entry = new char [TxtSize];
  3. GetWindowText (hWndEditBox, Entry, TxtSize);
  4. MessageBox (NULL, Entry, "", MB_OK | MB_ICONINFORMATION);
  5. delete[] Entry;
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