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 04, 2008 01:03 PM

can somebody help please

Crypter

748

April 04, 2008 02:52 PM

If you create the child control using CreateWindow(), you should use DestroyWindow() to delete them. For example:

DestroyWindow (hBtn);

asdfwe

100

Author

April 05, 2008 01:15 AM

i have even tries destroy window but but the button does not disapear

kindly help

asdfwe

100

Author

April 05, 2008 07:42 AM

any suggestions?

superpig

1,826

April 05, 2008 09:54 AM

Make sure that after you've called ShowWindow, you call glClear/glSwapBuffers.

Richard "Superpig" Fine - saving pigs from untimely fates - Microsoft DirectX MVP 2006/2007/2008/2009
"Shaders are not meant to do everything. Of course you can try to use it for everything, but it's like playing football using cabbage." - MickeyMouse

asdfwe

100

Author

April 05, 2008 09:58 AM

Quote:Original post by superpig
Make sure that after you've called ShowWindow, you call glClear/glSwapBuffers.

yes , i have used glClear(GL_COLOR_BUFFER_BIT);

but the buttons are not disapearing :(
kindly help
thanks

superpig

1,826

April 05, 2008 09:59 AM

Have you done it after calling ShowWindow?

asdfwe

100

Author

April 05, 2008 10:03 AM

yes
i have tried both destroy window
and
show window( with sh_hide )

and called giclear after
but buttons are not diapearing , but rest of my screen is cleared

Crypter

748

April 05, 2008 01:00 PM

Where do you call glClear()? After glClearColor() and in your main animation loop before rendering?

I also noticed you are not handling WM_PAINT to repaint your parent window. This might not be where your problem is though.

Can you please post your new WinMain() routine?

what the problem with this

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

what the problem with this

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Reticulating splines