WM_CTLCOLORDLG The WM_CTLCOLORDLG message is sent to a dialog box before the system draws the dialog box. By responding to this message, the dialog box can set its text and background colors using the specified display device context handle. A window receives this message through its WindowProc function. LRESULT CALLBACK WindowProc( HWND hwnd, // handle to window UINT uMsg, // WM_CTLCOLORDLG WPARAM wParam, // handle to DC (HDC) LPARAM lParam // handle to dialog box (HWND) ); Parameters wParam Handle to the device context for the dialog box. lParam Handle to the dialog box. Return Values If an application processes this message, it must return a handle to a brush. The system uses the brush to paint the background of the dialog box. Res By default, the DefWindowProc function selects the default system colors for the dialog box. The system does not automatically destroy the returned brush. It is the application's responsibility to destroy the brush when it is no longer needed.The WM_CTLCOLORDLG message is never sent between threads. It is sent only within one thread. Note that the WM_CTLCOLORDLG message is sent to the dialog box itself; all of the other WM_CTLCOLOR* messages are sent to the owner of the control. If a dialog box procedure handles this message, it should cast the desired return value to an INT_PTR and return the value directly. If the dialog box procedure returns FALSE, then default message handling is performed. The DWL_MSGRESULT value set by the SetWindowLong function is ignored.
The WM_CTLCOLORDLG message is sent to a dialog box before the system draws the dialog box. By responding to this message, the dialog box can set its text and background colors using the specified display device context handle. A window receives this message through its WindowProc function. LRESULT CALLBACK WindowProc(
HWND hwnd, // handle to window
UINT uMsg, // WM_CTLCOLORDLG
WPARAM wParam, // handle to DC (HDC)
LPARAM lParam // handle to dialog box (HWND)
);
Parameters
wParam
Handle to the device context for the dialog box.
lParam
Handle to the dialog box.
Return Values
If an application processes this message, it must return a handle to a brush. The system uses the brush to paint the background of the dialog box. Res
By default, the DefWindowProc function selects the default system colors for the dialog box. The system does not automatically destroy the returned brush. It is the application's responsibility to destroy the brush when it is no longer needed.The WM_CTLCOLORDLG message is never sent between threads. It is sent only within one thread. Note that the WM_CTLCOLORDLG message is sent to the dialog box itself; all of the other WM_CTLCOLOR* messages are sent to the owner of the control. If a dialog box procedure handles this message, it should cast the desired return value to an INT_PTR and return the value directly. If the dialog box procedure returns FALSE, then default message handling is performed. The DWL_MSGRESULT value set by the SetWindowLong function is ignored.
在projectnameapp::InitInstance()加入该函数即可，
怎么用滑竿控制颜色的变化？I DON'T KNOW!
改变背景色用SetDialogBkColor（）
有了DC ，你就可以为所欲为了
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