4. Seltsames Verhalten

Seltsames Verhalten

  • L

    Folgender Code funktioniert perfekt:

    #include <windows.h>

class Window
{
  private:
   HWND hWindow;
  public:
   void Create(LPCTSTR lpClassName, LPCTSTR lpWindowName, DWORD dwStyle, int x, int y, int nWidth, int nHeight, HWND hWndParent, HMENU hMenu, HINSTANCE hInstance, LPVOID lpParam);
   void SetLong(int nIndex, LONG dwNewLong);
   void SetPos(HWND hWndInsertAfter, int X, int Y, int cx, int cy, UINT uFlags);
   void Destroy();
   void Show(int nCmdShow);
   void Update();
};

void Window::Create(LPCTSTR lpClassName, LPCTSTR lpWindowName, DWORD dwStyle, int x, int y, int nWidth, int nHeight, HWND hWndParent, HMENU hMenu, HINSTANCE hInstance, LPVOID lpParam)
{
    hWindow = ::CreateWindow(lpClassName, lpWindowName, dwStyle, x, y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam);
    if(!hWindow) throw(GetLastError());
}
void Window::SetLong(int nIndex, LONG dwNewLong)
{
    if(!::SetWindowLong(hWindow, nIndex, dwNewLong)) throw(GetLastError());
}
void Window::Destroy()
{
    ::DestroyWindow(hWindow);
}
void Window::SetPos(HWND hWndInsertAfter, int X, int Y, int cx, int cy, UINT uFlags)
{
    if(!::SetWindowPos(hWindow, hWndInsertAfter, X, Y, cx, cy, uFlags)) throw(GetLastError);
}
void Window::Show(int nCmdShow)
{
   ::ShowWindow(hWindow, nCmdShow);
}
void Window::Update()
{
   ::UpdateWindow(hWindow);
}

LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
   switch (message)
   {
   case WM_DESTROY:
      {
         PostQuitMessage(0);
         return 0;
      }
   }
   return DefWindowProc(hWnd, message, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    MSG msg;
    WNDCLASS wndclass;
    wndclass.style = CS_HREDRAW | CS_VREDRAW ;
    wndclass.lpfnWndProc = WindowProc;
    wndclass.cbClsExtra = 0 ;
    wndclass.cbWndExtra = 0 ;
    wndclass.hInstance = hInstance ;
    wndclass.hIcon = ::LoadIcon (NULL, IDI_APPLICATION) ;
    wndclass.hCursor = ::LoadCursor (NULL, IDC_ARROW) ;
    wndclass.hbrBackground = (HBRUSH) ::GetStockObject (WHITE_BRUSH) ;
    wndclass.lpszMenuName = NULL ;
    wndclass.lpszClassName = "Die erste WNDCLASS";
    RegisterClass(&wndclass);

    Window win;
    win.Create("Die erste WNDCLASS", "Die erste WNDCLASS", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance,  NULL);
    win.Show(SW_SHOWNORMAL);
    win.Update();

    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}

    Der Code hingegen (sind 3 Files) führt zu folgendem Fehler (fast nur auf meinem PC):
    Runtime Error!
    Progam: [schnipp].exe
    The Application has requested the Runtime to terminate it in an unusual way. Please contect...

    #ifndef WINDOW_HPP
#define WINDOW_HPP
#include <windows.h>
namespace las
{
class Window
{
  private:
    HWND hWindow;
  public:
    void Create(LPCTSTR lpClassName, LPCTSTR lpWindowName, DWORD dwStyle, int x, int y, int nWidth, int nHeight, HWND hWndParent, HMENU hMenu, HINSTANCE hInstance, LPVOID lpParam);
    void SetLong(int nIndex, LONG dwNewLong);
    void SetPos(HWND hWndInsertAfter, int X, int Y, int cx, int cy, UINT uFlags);
    void Destroy();
    void Update();
    void Show(int nCmdShow);
};
}
#endif
#include "window.hpp"
using namespace las;

void Window::Create(LPCTSTR lpClassName, LPCTSTR lpWindowName, DWORD dwStyle, int x, int y, int nWidth, int nHeight, HWND hWndParent, HMENU hMenu, HINSTANCE hInstance, LPVOID lpParam)
{
    hWindow = ::CreateWindow(lpClassName, lpWindowName, dwStyle, x, y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam);
    if(!hWindow) throw(GetLastError());
}
void Window::SetLong(int nIndex, LONG dwNewLong)
{
    if(!::SetWindowLong(hWindow, nIndex, dwNewLong)) throw(GetLastError());
}
void Window::Destroy()
{
    ::DestroyWindow(hWindow);
}
void Window::SetPos(HWND hWndInsertAfter, int X, int Y, int cx, int cy, UINT uFlags)
{
    if(!::SetWindowPos(hWindow, hWndInsertAfter, X, Y, cx, cy, uFlags)) throw(GetLastError);
}
void Window::Update()
{
    if(!::UpdateWindow(hWindow)) throw(GetLastError);
}
void Window::Show(int nCmdShow)
{
    if(!::ShowWindow(hWindow, nCmdShow)) throw(GetLastError);
}
#include "window.hpp"
#include <windows.h>
using namespace las;
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    MSG msg;
    WNDCLASS wndclass;
    wndclass.style = CS_HREDRAW | CS_VREDRAW ;
    wndclass.lpfnWndProc = WindowProc;
    wndclass.cbClsExtra = 0 ;
    wndclass.cbWndExtra = 0 ;
    wndclass.hInstance = hInstance ;
    wndclass.hIcon = ::LoadIcon (NULL, IDI_APPLICATION) ;
    wndclass.hCursor = ::LoadCursor (NULL, IDC_ARROW) ;
    wndclass.hbrBackground = (HBRUSH) ::GetStockObject (WHITE_BRUSH) ;
    wndclass.lpszMenuName = NULL ;
    wndclass.lpszClassName = "Die erste WNDCLASS"; 
    RegisterClass(&wndclass);
    Window win;
    win.Create("Die erste WNDCLASS", "Die erste WNDCLASS", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance,  NULL);
    win.Show(SW_SHOWNORMAL);
    win.Update();
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
}
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
   switch (message)
   {
   case WM_DESTROY:
      {
         PostQuitMessage(0);
         return 0;
      }
   }
   return DefWindowProc(hWnd, message, wParam, lParam);
}

    Ich hatte mal Visual Studio .NET drauf, deinstalliert...
    Dann Visual C++6 Autorenedition deinstalliert....

    0
  • D
     

    namespace las
{
class Window
{
  private:
    HWND hWindow;
  public:
    void Create(LPCTSTR lpClassName, LPCTSTR lpWindowName, DWORD dwStyle, int x, int y, int nWidth, int nHeight, HWND hWndParent, HMENU hMenu, HINSTANCE hInstance, LPVOID lpParam);
    void SetLong(int nIndex, LONG dwNewLong);
    void SetPos(HWND hWndInsertAfter, int X, int Y, int cx, int cy, UINT uFlags);
    void Destroy();
    void Update();
    void Show(int nCmdShow);
};
} <------- Semikolon fehlt!!

    Ob das der Grund für den Fehler ist, glaub ich aber eher net ...

    0
  • L

    Nein es liegt an etwas das selbst kein WinAPI Progger gesehen hat:
    if(!::ShowWindow(hWindow, nCmdShow)) throw(GetLastError());
    und damit:
    Return Values
    If the window was previously visible, the return value is nonzero.
    If the window was previously hidden, the return value is zero.

    0
  • E

    Daher habe ich den "Blödsinn" in meinem Code weg gelassen. 😉

    0
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