what the problem with this

asdfwe · 2008-04-05T13:00:46

i wrote a code to make a button on my opengl window like this. but the button appears only when i clicks upon its location and again disapears......... i was trying to make a regular button which always remained on the screen . here goes my code.. please point out the reasons for it not working ........ #include <windows.h> #include <gl/gl.h> HINSTANCE hInst; LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam); VOID EnableOpenGL(HWND hWnd, HDC * hDC, HGLRC * hRC); VOID DisableOpenGL(HWND hWnd, HDC hDC, HGLRC hRC); // WinMain int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int iCmdShow) { WNDCLASS wc; HWND hWnd; HDC hDC; HGLRC hRC; MSG msg; BOOL bQuit = FALSE; float theta = 0.0f; // register window class wc.style = CS_OWNDC; 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)GetStockObject( BLACK_BRUSH ); wc.lpszMenuName = NULL; wc.lpszClassName = "GLSample"; RegisterClass( &wc ); // create main window hWnd = CreateWindow( "GLSample", "OpenGL Sample", WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE, 0, 0, 256, 256, NULL, NULL, hInstance, NULL); // enable OpenGL for the window EnableOpenGL( hWnd, &hDC, &hRC ); HWND hBtn = NULL; hBtn = CreateWindow("BUTTON","a", WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON, 50,50,100,25, hWnd, (HMENU)103, hInst,NULL); // program main loop while (!bQuit) { // check for messages if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) { // handle or dispatch messages if (msg.message == WM_QUIT) { bQuit = TRUE; } else { TranslateMessage(&msg); DispatchMessage(&msg); } } else { // OpenGL animation code goes here glClearColor(0.0f, 0.0f, 0.0f, 0.0f); glBegin(GL_TRIANGLES); glColor3f( 1.0f, 0.0f, 0.0f ); glVertex2f( 0.0f, 1.0f ); glColor3f( 0.0f, 1.0f, 0.0f ); glVertex2f( 0.87f, -0.5f ); glColor3f( 0.0f, 0.0f, 1.0f ); glVertex2f( -0.87f, -0.5f ); glEnd(); SwapBuffers( hDC ); } } // shutdown OpenGL DisableOpenGL( hWnd, hDC, hRC ); // destroy the window explicitly DestroyWindow( hWnd ); return msg.wParam; } // Window Procedure LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) { case WM_CREATE: return 0; case WM_CLOSE: PostQuitMessage( 0 ); return 0; case WM_DESTROY: return 0; case WM_KEYDOWN: switch (wParam) { case VK_ESCAPE: PostQuitMessage( 0 ); return 0; } return 0; default: return DefWindowProc(hWnd, message, wParam, lParam); } } // Enable OpenGL VOID EnableOpenGL( HWND hWnd, HDC * hDC, HGLRC * hRC ) { PIXELFORMATDESCRIPTOR pfd; int iFormat; // get the device context (DC) *hDC = GetDC( hWnd ); // set the pixel format for the DC ZeroMemory( &pfd, sizeof( pfd ) ); pfd.nSize = sizeof( pfd ); pfd.nVersion = 1; pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER; pfd.iPixelType = PFD_TYPE_RGBA; pfd.cColorBits = 24; pfd.cDepthBits = 16; pfd.iLayerType = PFD_MAIN_PLANE; iFormat = ChoosePixelFormat( *hDC, &pfd ); SetPixelFormat( *hDC, iFormat, &pfd ); // create and enable the render context (RC) *hRC = wglCreateContext( *hDC ); wglMakeCurrent( *hDC, *hRC ); } // Disable OpenGL VOID DisableOpenGL( HWND hWnd, HDC hDC, HGLRC hRC ) { wglMakeCurrent( NULL, NULL ); wglDeleteContext( hRC ); ReleaseDC( hWnd, hDC ); } i tried to write the createbutton statement in wm_create but that also creates the same problem thanks in advance [Edited by - asdfwe on April 4, 2008 5:02:35 AM]

For Beginners

Started by asdfwe April 02, 2008 12:25 PM

37 comments, last by Crypter 16 years ago

asdfwe

100

Author

April 03, 2008 02:49 PM

when i wrote this , it gave error

invalid conversion from `void*' to `LPARAM'
initializing argument 4 of `LRESULT SendMessageA(HWND__*, UINT, WPARAM, LPARAM)'

how to correct it?
thanks

MJP

20,295

April 03, 2008 02:58 PM

Sorry, forgot the cast.

SendMessage( hBtn, BM_SETIMAGE, IMAGE_BITMAP, reinterpret_cast<LPARAM>(hBitmap) );

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asdfwe

100

Author

April 03, 2008 03:31 PM

thanks a lot
i have made my buttons as desired by me
thanks again...................

asdfwe

100

Author

April 04, 2008 04:52 AM

but now i cant clear my screen since the buttons are there permanently

how to remove them from my opengl window?
please help
thanks

asdfwe

100

Author

April 04, 2008 06:16 AM

i was clearing my screen by glClear(GL_COLOR_BUFFER_BIT);

but buttons were not dispearing
can someone help
thanks

asdfwe

100

Author

April 04, 2008 08:13 AM

any suggestions?

MJP

20,295

April 04, 2008 08:19 AM

Buttons and other controls will automatically redraw themselves, if you don't want them to be drawn you can hide them with ShowWindow.

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asdfwe

100

Author

April 04, 2008 08:22 AM

Quote:Original post by MJP
Buttons and other controls will automatically redraw themselves, if you don't want them to be drawn you can hide them with ShowWindow.

how to hide them by showwindow . i think we have to use
ShowWindow(hWnd, nFunsterStil);

but with what value of nFunsterStil ?

MJP

20,295

April 04, 2008 08:59 AM

All the possible values are listed in the documentation.

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asdfwe

100

Author

April 04, 2008 10:27 AM

Quote:Original post by MJP
All the possible values are listed in the documentation.

i tried ShowWindow(hBtn, SW_HIDE); but it does not remove the button from my window

please help

what the problem with this

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what the problem with this

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