i tried to make my own basecode for an opengl app but it doesnt work i narrowed the problem down to the hwnd being empty even after calling createwindow function,, help me.... heres the code, i skipped some code that has nothing to do wit the problem(...hope someone would be kind enough to read all this..) ///////////////stuff...////////////////// #include <windows.h>#include <string.h>#include <stdlib.h>#include <stdio.h>#include <gl.h>#include <glu.h> #define WIDTH 640#define HEIGHT 480 bool keys[256];HWND hwnd;HDC hdc;HGLRC hrc;RECT rect; LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM); void msg(char* message) { MessageBox(NULL,message,"ERROR",MB_OK); } bool fullscreen() //code skipped because fullscreen works //////////////important stuff..//////////////////// void WindowCreate(HINSTANCE hInst) { WNDCLASS wc; memset(&wc,0,sizeof(wc)); wc.nonostyle=CS_VREDRAW|CS_HREDRAW; wc.lpfnWndProc=WndProc; wc.hInstance=hInst; wc.hIcon=LoadIcon(NULL,IDI_APPLICATION); wc.hCursor=LoadCursor(NULL,IDC_ARROW); wc.hbrBackground=(HBRUSH)(COLOR_WINDOW+1); wc.lpszClassName="app"; if(!RegisterClass(&wc)) msg("register class error"); fullscreen(); ///////////PROBLEM////////////////////////////////// hwnd=CreateWindow("app","app",WS_POPUP|WS_CLIPSIBLINGS|WS_CLIPCHILDREN,0,0,WIDTH,HEIGHT,NULL,NULL,hInst,NULL); //////////////////////////////////////////////////// if(!hwnd)msg("create window error"); if(!ShowWindow(hwnd,SW_SHOWNORMAL))msg("show window error"); if(!UpdateWindow(hwnd))msg("update window error"); SetFocus(hwnd); } int WINAPI WinMain(HINSTANCE hInst,HINSTANCE hPrevInst, PSTR cmdshow, int cmdline) { WindowCreate(hInst); hdc=GetDC(hwnd); pixelformat(); hrc=wglCreateContext(hdc); wglMakeCurrent(hdc,hrc); resize(640,480); GLinit(); //main loop was here as well as msg translate/dispatch return (msg.wParam); } //////////the rest.../////////////////// bool pixelformat() { PIXELFORMATDESCRIPTOR pfd; memset(&pfd,0,sizeof(pfd)); pfd.nSize=sizeof(PIXELFORMATDESCRIPTOR); pfd.nVersion=1; pfd.dwFlags=PFD_DRAW_TO_WINDOW|PFD_SUPPORT_OPENGL|PFD_DOUBLEBUFFER; pfd.dwLayerMask=PFD_MAIN_PLANE; pfd.iPixelType=PFD_TYPE_RGBA; pfd.cColorBits=16; pfd.cDepthBits=16; pfd.cStencilBits=0; int pixel=ChoosePixelFormat(hdc,&pfd); if(!pixel)msg("pixelformat choose unsuccessful"); if(!SetPixelFormat(hdc,pixel,&pfd))msg("pixelformat setting unsuccessful"); return true; } void resize(GLsizei width,GLsizei height) //code skipped void GLinit() //code skipped void DeInit() //code skipped LRESULT CALLBACK WndProc(HWND hWnd,UINT uMsg,WPARAM //code skipped /i dont know how to put all code inside a white box...sorry..