En C, avec visual C++, est t'il possible de redimmentionner la fenetre ?
thx  

Peut-être avec SetWindowPos()
 
The SetWindowPos function changes the size, position, and Z order of a child, pop-up, or top-level window. Child, pop-up, and top-level windows are ordered according to their appearance on the screen. The topmost window receives the highest rank and is the first window in the Z order.  
 
BOOL SetWindowPos(
    HWND hWnd, // handle of window
    HWND hWndInsertAfter, // placement-order handle
    int X, // horizontal position
    int Y, // vertical position
    int cx, // width
    int cy, // height
    UINT uFlags  // window-positioning flags
   );