能选择颜色的组合框

   我最近在写程序的时候，经常碰到需要选择颜色的控件，这种控件在许多地方是比较常用的，就象QQ聊天室中可以选择自己所说的话的颜色的那种控件，这其实就是在一个基本对话框上添加一个或者几个组合框，然后可以通过组合框选择你想要的颜色而已。

    下面就是程序代码，你需要做的很简单，你只要把下面的2个文件添加到你工程中，然后你还要通过VC的类向导创建一个该类型的成员变量给组合框，这样就行了。如果你想有更多的颜色选择的话，你可以通过修改.CPP文件中的有关与颜色定义的数组就行了，或者说你有更好的编程水平的话，你完全可以把它扩展成一个很实用的类。我没有把代码全部都看过，我想读者如果有兴趣的话，最好还是把代码全部看一遍，这样会对你更有好处的。以下是全部代码：

//头文件
#if !defined(afx_combocolorpicker_h__b2348841_5541_11d1_8756_00a0c9181e86__included_)
#define afx_combocolorpicker_h__b2348841_5541_11d1_8756_00a0c9181e86__included_

#if _msc_ver >= 1000
#pragma once
#endif // _msc_ver >= 1000
// combocolorpicker.h : header file
// ? 1997 baldvin hansson

/////////////////////////////////////////////////////////////////////////////
// ccombocolorpicker window

class ccombocolorpicker : public ccombobox
{
// construction
public:
    ccombocolorpicker();

// attributes
private:
    bool m_binitialized;
    static colorref m_rgstandardcolors[];
public:

// operations
private:
    void initializedata();
public:
    colorref getselectedcolor();

// overrides
    // classwizard generated virtual function overrides
    //{{afx_virtual(ccombocolorpicker)
    protected:
    virtual void presubclasswindow();
    //}}afx_virtual
    virtual void drawitem(lpdrawitemstruct lpdrawitemstruct);

// implementation
public:
    virtual ~ccombocolorpicker();

    // generated message map functions
protected:
    //{{afx_msg(ccombocolorpicker)
    afx_msg int oncreate(lpcreatestruct lpcreatestruct);
    //}}afx_msg

    declare_message_map()
};

/////////////////////////////////////////////////////////////////////////////

//{{afx_insert_location}}
// microsoft developer studio will insert additional declarations immediately before the previous line.

#endif // !defined(afx_combocolorpicker_h__b2348841_5541_11d1_8756_00a0c9181e86__included_)

//以下是对于的CPP文件
// combocolorpicker.cpp : implementation file
// ? 1997 baldvin hansson

#include "stdafx.h"
#include "combocolorpicker.h"

#ifdef _debug
#define new debug_new
#undef this_file
static char this_file[] = __file__;
#endif

/////////////////////////////////////////////////////////////////////////////
// ccombocolorpicker

colorref ccombocolorpicker::m_rgstandardcolors[] = {
    rgb(0, 0, 0),            // black
    rgb(255, 255, 255),        // white
    rgb(128, 0, 0),            // dark red
    rgb(0, 128, 0),            // dark green
    rgb(128, 128, 0),        // dark yellow
    rgb(0, 0, 128),            // dark blue
    rgb(128, 0, 128),        // dark magenta
    rgb(0, 128, 128),        // dark cyan
    rgb(192, 192, 192),        // light grey
    rgb(128, 128, 128),        // dark grey
    rgb(255, 0, 0),            // red
    rgb(0, 255, 0),            // green
    rgb(255, 255, 0),        // yellow
    rgb(0, 0, 255),            // blue
    rgb(255, 0, 255),        // magenta
    rgb(0, 255, 255),        // cyan
    };

ccombocolorpicker::ccombocolorpicker()
{
    m_binitialized = false;
}

ccombocolorpicker::~ccombocolorpicker()
{
}


begin_message_map(ccombocolorpicker, ccombobox)
    //{{afx_msg_map(ccombocolorpicker)
    on_wm_create()
    //}}afx_msg_map
end_message_map()

/////////////////////////////////////////////////////////////////////////////
// ccombocolorpicker message handlers

int ccombocolorpicker::oncreate(lpcreatestruct lpcreatestruct)
{
    if (ccombobox::oncreate(lpcreatestruct) == -1)
        return -1;
    
    initializedata();

    return 0;
}

void ccombocolorpicker::presubclasswindow()
{
    initializedata();
    
    ccombobox::presubclasswindow();
}

void ccombocolorpicker::initializedata()
{
    int nitem;

    if (m_binitialized)
        return;

    for (int ncolor = 0; ncolor hdc))
        return;

    colorref rgbtextcolor = dc.gettextcolor();
    colorref rgbbkcolor = dc.getbkcolor();

    if (lpdrawitemstruct->itemaction & oda_focus)
    {
        dc.drawfocusrect(&lpdrawitemstruct->rcitem);
    }
    else if (lpdrawitemstruct->itemaction & oda_drawentire)
    {
        if (lpdrawitemstruct->itemstate & ods_focus)
            dc.drawfocusrect(&lpdrawitemstruct->rcitem);
        else
            dc.exttextout(0, 0, eto_opaque, &lpdrawitemstruct->rcitem, _t(""), 0, null);
    }

    if (0 <= (int)lpdrawitemstruct->itemid)    // any item selected?
    {
        ::inflaterect(&lpdrawitemstruct->rcitem, -2, -2);
        
        dc.fillsolidrect(&lpdrawitemstruct->rcitem, (colorref)lpdrawitemstruct->itemdata);
        dc.framerect(&lpdrawitemstruct->rcitem, &brushblack);
    }

    // restore the dc state
    dc.settextcolor(rgbtextcolor);
    dc.setbkcolor(rgbbkcolor);
    dc.detach();
}

colorref ccombocolorpicker::getselectedcolor()
{
    int nitem = getcursel();
    if (cb_err == nitem)
        return rgb(0, 0, 0);    // default to black if nothing is selected

    return m_rgstandardcolors[nitem];
}