| /* |
| * Window classes functions |
| * |
| * Copyright 1993 Alexandre Julliard |
| */ |
| |
| static char Copyright[] = "Copyright Alexandre Julliard, 1993"; |
| |
| #include "class.h" |
| |
| |
| static HCLASS firstClass = 0; |
| |
| |
| /*********************************************************************** |
| * CLASS_FindClassByName |
| * |
| * Return a handle and a pointer to the class. |
| * The caller must GlobalUnlock the pointer. |
| */ |
| HCLASS CLASS_FindClassByName( char * name, CLASS **ptr ) |
| { |
| HCLASS class, next; |
| |
| class = firstClass; |
| while(class) |
| { |
| *ptr = (CLASS *) GlobalLock(class); |
| if (!strcmp( (*ptr)->wc.lpszClassName, name )) return class; |
| next = (*ptr)->hNext; |
| GlobalUnlock(class); |
| class = next; |
| } |
| return 0; |
| } |
| |
| /*********************************************************************** |
| * CLASS_FindClassPtr |
| * |
| * Return a pointer to the CLASS structure corresponding to a HCLASS. |
| * The caller must GlobalUnlock the pointer. |
| */ |
| CLASS * CLASS_FindClassPtr( HCLASS hclass ) |
| { |
| CLASS * ptr; |
| |
| if (!hclass) return NULL; |
| ptr = (CLASS *) GlobalLock( hclass ); |
| if (ptr->wMagic != CLASS_MAGIC) |
| { |
| GlobalUnlock( hclass ); |
| return NULL; |
| } |
| return ptr; |
| } |
| |
| |
| /*********************************************************************** |
| * RegisterClass (USER.57) |
| */ |
| ATOM RegisterClass( LPWNDCLASS class ) |
| { |
| CLASS * newClass; |
| HCLASS handle; |
| int i; |
| |
| #ifdef DEBUG_CLASS |
| printf( "RegisterClass: wndproc=%08x hinst=%d name='%s'\n", |
| class->lpfnWndProc, class->hInstance, class->lpszClassName ); |
| #endif |
| |
| handle = GlobalAlloc( GMEM_MOVEABLE, sizeof(CLASS)+class->cbClsExtra ); |
| if (!handle) return 0; |
| newClass = (CLASS *) GlobalLock( handle ); |
| newClass->hNext = firstClass; |
| newClass->wMagic = CLASS_MAGIC; |
| newClass->atomName = handle; /* Should be an atom */ |
| newClass->hDCE = 0; /* Should allocate a DCE if needed */ |
| newClass->cWindows = 0; |
| newClass->wc = *class; |
| |
| newClass->wc.lpszMenuName = 0; |
| |
| /* Class name should also be set to zero. For now we need the |
| * name because we don't have atoms. |
| */ |
| newClass->wc.lpszClassName = (char *)malloc(strlen(class->lpszClassName)+1); |
| strcpy( newClass->wc.lpszClassName, class->lpszClassName ); |
| |
| if (class->cbClsExtra) memset( newClass->wExtra, 0, class->cbClsExtra ); |
| |
| GlobalUnlock( handle ); |
| |
| firstClass = handle; |
| return handle; /* Should be an atom */ |
| } |
| |
| |
| /*********************************************************************** |
| * UnregisterClass (USER.403) |
| */ |
| BOOL UnregisterClass( LPSTR className, HANDLE instance ) |
| { |
| HANDLE class, next, prevClass; |
| CLASS * classPtr, * prevClassPtr; |
| |
| /* Check if we can remove this class */ |
| class = CLASS_FindClassByName( className, &classPtr ); |
| if (!class) return FALSE; |
| if ((classPtr->wc.hInstance != instance) || (classPtr->cWindows > 0)) |
| { |
| GlobalUnlock( class ); |
| return FALSE; |
| } |
| |
| /* Remove the class from the linked list */ |
| if (firstClass == class) firstClass = classPtr->hNext; |
| else |
| { |
| prevClass = firstClass; |
| while (prevClass) |
| { |
| prevClassPtr = (CLASS *) GlobalLock(prevClass); |
| next == prevClassPtr->hNext; |
| if (next == class) break; |
| GlobalUnlock(prevClass); |
| prevClass = next; |
| } |
| if (!prevClass) |
| { |
| printf( "ERROR: Class list corrupted\n" ); |
| return FALSE; |
| } |
| prevClassPtr->hNext = classPtr->hNext; |
| GlobalUnlock( prevClass ); |
| } |
| |
| GlobalUnlock( class ); |
| GlobalFree( class ); |
| return TRUE; |
| } |