unit3.cpp

来自「本书《C++Builder与WindowsAPI经典范例》附含配套光盘包括132」· C++ 代码 · 共 26 行

//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop

#include "Unit3.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::WMNotify(TMessage &Msg)
{
//转换信息内容
LPNMHDR nmh = (NMHDR *)Msg.LParam;
//若通过的信息是属于ToolBar的NM_CUSTOMDRAW信息
HWND HToolBar = ToolBar1->Handle;
if(nmh->code == NM_CUSTOMDRAW && nmh->hwndFrom == HToolBar)
  {
  //转换成NMTBCUSTOMDRAW结构
  LPNMTBCUSTOMDRAW lptbcd = (NMTBCUSTOMDRAW *)Msg.LParam;
  //并解析与改换此结构<背景绘制>成员