Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 238)

II. SOFTWARE GUIDES - 10. Driver488/W31 10E. C Languages
Personal488 User’s Manual, Rev. 3.0 II-223
/*******************************************************************/
/*
*/
/* nCwRegisterClasses Function */
/* */
/* The following function registers all the classes of all the */
/* windows associated with this application. The function returns */
/* an error code if unsuccessful, otherwise it returns 0.
*/
/* */
/*******************************************************************/
int nCwRegisterClasses(void)
{
WNDCLASS wndclass; /* struct to define a window class
*/
memset(&wndclass, 0x00, sizeof(WNDCLASS));
/* load WNDCLASS with window’s characteristics */
wndclass.style = CS_HREDRAW | CS_VREDRAW | CS_BYTEALIGNWINDOW;
wndclass.lpfnWndProc = WndProc;
/* Extra storage for Class and Window objects
*/
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInst;
wndclass.hIcon = LoadIcon(hInst, “EXAMPLE2");
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
/* Create brush for erasing background
*/
wndclass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wndclass.lpszMenuName = szAppName;
/* Menu Name is App Name */
wndclass.lpszClassName = szAppName; /* Class Name is App Name*/
if (!RegisterClass(&wndclass))
return -1;
return(0);
} /* End of nCwRegisterClasses
*/
/*******************************************************************/
/* cwCenter Function
*/
/* */
/* centers a window based on the client area of its parent */
/* */
/*******************************************************************/
void cwCenter(hWnd, top)
HWND hWnd;
int top;
{
POINT pt;
RECT swp;
RECT rParent;
int iwidth;
int iheight;
/* get the rectangles for the parent and the child */
GetWindowRect(hWnd, &swp);
GetClientRect(hWndMain, &rParent);
/* calculate the height and width for MoveWindow */
iwidth = swp.right - swp.left;
iheight = swp.bottom - swp.top;
/* find the center point and convert to screen coordinates */
pt.x = (rParent.right - rParent.left) / 2;
pt.y = (rParent.bottom - rParent.top) / 2;
ClientToScreen(hWndMain, &pt);
/* calculate the new x, y starting point */
pt.x = pt.x - (iwidth / 2);
pt.y = pt.y - (iheight / 2);
/* top will adjust the window position, up or down
*/
if (top)