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pitel:itu:cviceni1

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pitel:itu:cviceni1 [03. 07. 2012, 11.53:41] – upraveno mimo DokuWiki 127.0.0.1pitel:itu:cviceni1 [30. 12. 2022, 13.43:01] (aktuální) – upraveno mimo DokuWiki 127.0.0.1
Řádek 1: Řádek 1:
 +====== Událostmi řízená aplikace (WinAPI) ======
 +[[http://www.flickr.com/photos/pitel/2957411947/|{{ http://farm4.static.flickr.com/3221/2957411947_08f4543cf4.jpg |Událostmi řízená aplikace (WinAPI)}}]]
  
 +<file c main.c>
 +#include <windows.h>
 +#include <stdio.h>
 +#include <string.h>
 +
 +// Global variables
 +HINSTANCE hInst;
 +UINT uMyMsgWndMoving;
 +HINSTANCE mhInst;
 +HWND mhWnd; // handle to own window (initialize in WinMain)
 +HDC mhDC; // device context (initialize in each Paint function calling)
 +
 +// Function prototypes.
 +int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int);
 +LRESULT CALLBACK MainWndProc(HWND, UINT, WPARAM, LPARAM);
 +void onPaint(HWND hWnd);
 +BOOL CALLBACK PrintEnumWindowsProc(HWND hWnd,LPARAM lParam);
 +
 +// Application entry point.
 +int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
 +    MSG msg;
 +    BOOL bRet;
 +    WNDCLASS wcx; // register class
 +    
 +    hInst = hInstance; // Save the application-instance handle.
 +    uMyMsgWndMoving = RegisterWindowMessage("MyMessage");
 +    
 +    // Fill in the window class structure with parameters that describe the main window.
 +    wcx.style = CS_HREDRAW | CS_VREDRAW; // redraw if size changes
 +    wcx.lpfnWndProc = (WNDPROC) MainWndProc; // points to window procedure
 +    wcx.cbClsExtra = 0; // no extra class memory
 +    wcx.cbWndExtra = 0; // no extra window memory
 +    wcx.hInstance = hInstance; // handle to instance
 +    wcx.hIcon = LoadIcon(NULL, IDI_APPLICATION); // predefined app. icon
 +    wcx.hCursor = LoadCursor(NULL, IDC_ARROW); // predefined arrow
 +    wcx.hbrBackground = GetStockObject(WHITE_BRUSH); // white background brush
 +    wcx.lpszMenuName = (LPCSTR) "MainMenu"; // name of menu resource
 +    wcx.lpszClassName = (LPCSTR) "ITUClass"; // name of window class
 +    
 +    // Register the window class.
 +    if (!RegisterClass(&wcx)) {
 + return FALSE;
 +    }
 +    
 +    // create window of registered class
 +    mhWnd = CreateWindow("ITUClass", "ITU", WS_OVERLAPPEDWINDOW, 0, 0, 200, 200, (HWND) NULL, (HMENU) NULL, hInstance, (LPVOID) NULL);
 +    if (!mhWnd) {
 + return FALSE;
 +    }
 +    
 +    // Show the window and send a WM_PAINT message to the window procedure.
 +    // Record the current cursor position.
 +    ShowWindow(mhWnd, nCmdShow);
 +    UpdateWindow(mhWnd);
 +    
 +    while ((bRet = GetMessage(&msg, NULL, 0, 0 )) != 0) {
 +        if (bRet == -1) {
 +            // handle the error and possibly exit
 +        } else {
 +            TranslateMessage(&msg);
 +            DispatchMessage(&msg);
 +        }
 +    }
 +    
 +    PostMessage(HWND_BROADCAST, uMyMsgWndMoving, 0, 0);
 +    return (int) msg.wParam;
 +}
 +
 +LRESULT CALLBACK MainWndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
 +    InvalidateRect(hWnd, NULL, 0);
 +    
 +    // Some of the application instance is moving
 +    if (uMsg == uMyMsgWndMoving) {
 +        InvalidateRect(hWnd, NULL, 1);
 +        return 0;
 +    }
 +    
 +    switch (uMsg) {
 + case WM_CREATE:
 +     // Initialize the window.
 +     return 0;
 +     
 + case WM_SIZE:
 +            // Set the size and position of the window.
 +     PostMessage(HWND_BROADCAST, uMyMsgWndMoving, 0, 0);
 +     return 0;
 +     
 + case WM_MOVE:
 +     // Set the new window position. (Send it to all application instances.)
 +     PostMessage(HWND_BROADCAST, uMyMsgWndMoving, 0, 0);
 +     return 0;
 +     
 + case WM_PAINT:
 +            // Paint the window's client area.
 +            onPaint(hWnd);
 +            return 0;
 +     
 + case WM_DESTROY:
 +            // Clean up window-specific data objects.
 +            PostQuitMessage(0);
 +            return 0;
 +     
 +        default:
 +            return DefWindowProc(hWnd, uMsg, wParam, lParam);
 +    }
 +}
 +
 +void onPaint(HWND hWnd) {
 +    PAINTSTRUCT ps; // information can be used to paint the client area of a window owned by that application  
 +    mhDC = BeginPaint(hWnd, &ps); // prepares the specified window for painting (use global variable)
 +    EnumWindows(&PrintEnumWindowsProc, 0); // process PrintEnumWindowsProc function to all existed windows
 +    DeleteDC(mhDC); // deletes the specified device context
 +    EndPaint(hWnd, &ps); // marks the end of painting in the specified window
 +}
 +
 +BOOL CALLBACK PrintEnumWindowsProc(HWND hWnd, LPARAM lParam) {
 +    char WClassName[256];
 +    char mWClassName[256];
 +    RECT myRect, otherRect;
 +    
 +    GetClassName(hWnd, WClassName,  256); // get class name of some system window
 +    GetClassName(mhWnd, mWClassName, 256); // get class name of your own window
 +    
 +    if ((strcmp(WClassName, mWClassName) == 0) && (hWnd != mhWnd)) {
 + GetWindowRect(mhWnd, &myRect);
 + GetWindowRect(hWnd, &otherRect);
 +
 + int myX = (myRect.right - myRect.left) / 2;
 + int myY = (myRect.bottom - myRect.top) / 2;
 + int otherX = otherRect.left - myRect.left + (otherRect.right - otherRect.left) / 2;
 + int otherY = otherRect.top - myRect.top + (otherRect.bottom - otherRect.top) / 2;
 + MoveToEx(mhDC, myX, myY, NULL);
 + LineTo(mhDC, otherX, otherY);
 +    }
 +    
 +    return TRUE;
 +}
 +</file>
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