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子视窗控制项(二十九)

2010-12-30 21:12:42 · 作者: · 浏览: 33087
标签: 视窗 控制
所示。COLORS1在显示区域的左半部显示三种卷动列，并分别标以「Red」、「 Green」和「Blue」。当您挪动卷动列时，显示区域的右半部将变为三种原色混合而成的合成色，三种原色的数值显示在三个卷动列的下面。

 程式9-3 COLORS1
COLORS1.C
/*------------------------------------------------------------------------
COLORS1.C -- Colors Using Scroll Bars
(c) Charles Petzold, 1998
-------------------------------------------------------------------------*/

#include <windows.h>
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
LRESULT CALLBACK ScrollProc (HWND, UINT, WPARAM, LPARAM) ;

int idFocus ;
WNDPROC OldScroll[3] ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("Colors1") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;

wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = CreateSolidBrush (0) ;
wndclass.lpszM