Original Post
Hi, I have found this code openGL surfing the net. // // GLSAMPLE.CPP // by Blaine Hodge // // Includes #include #include // Function Declarations 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 quit = 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 ); // program main loop while ( !quit ) { // check for messages if ( PeekMessage( &msg, NULL, 0, 0, PM_REMOVE ) ) { // handle or dispatch messages if ( msg.message == WM_QUIT ) { quit = TRUE; } else { TranslateMessage( &msg ); DispatchMessage( &msg ); } } else { // OpenGL animation code goes here glClearColor( 0.0f, 0.0f, 0.0f, 0.0f ); glClear( GL_COLOR_BUFFER_BIT ); glPushMatrix(); glRotatef( theta, 0.0f, 0.0f, 1.0f ); 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(); glPopMatrix(); SwapBuffers( hDC ); theta += 1.0f; } } // 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 format; // 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; format = ChoosePixelFormat( *hDC, &pfd ); SetPixelFormat( *hDC, format, &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 ); } When I compile it using visual studio 2005,I have these errors: :\documents and settings\desktop\glsample\glsample.cpp(41) : error C2440: '=' : cannot convert from 'const char [9]' to 'LPCWSTR' Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast c:\documents and settings\desktop\glsample\glsample.cpp(49) : error C2664: 'CreateWindowExW' : cannot convert parameter 2 from 'const char [9]' to 'LPCWSTR' Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast c:\documents and settings\desktop\glsample\glsample.cpp(105) : warning C4244: 'return' : conversion from 'WPARAM' to 'int', possible loss of data How can I do? Thanks