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一个使用多媒体定时器的简单例子

 2008-03-08 12:52:09 来源:WEB开发网   
核心提示:1)新建一个工程,保存2)添加一个Button和一个Label3)修改unit1.h代码如下:// ---#ifndef Unit1H#define Unit1H// ---#include <Classes.hpp>#include <Controls.hpp>#include <Std

  1)新建一个工程,保存

2)添加一个Button和一个Label

3)修改unit1.h代码如下:
// ---------------------------------------------------------------------------
#ifndef Unit1H
#define Unit1H
// ---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
// ---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published: // IDE-managed Components
  TButton *Button1;
  TLabel *Label1;
  void __fastcall Button1Click(TObject *Sender);
  void __fastcall FormCloseQuery(TObject *Sender, bool &CanClose);
PRivate: // User declarations
public: // User declarations
  __fastcall TForm1(TComponent* Owner);
  static void CALLBACK TimeProc(UINT uID,UINT uMsg,
    DWord dwUser,DWORD dw1,DWORD dw2); // 定时器回调函数
  int TimerID; // 定时器ID
};
// ---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
// ---------------------------------------------------------------------------
#endif

4)unit1.cpp代码如下:
// ---------------------------------------------------------------------------

#include <vcl.h>
#include "mmsystem.h"
#pragma hdrstop
#include "Unit1.h"
// ---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
// ---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
  : TForm(Owner)
{
  TimerID = 0;
}
// ---------------------------------------------------------------------------
void CALLBACK TForm1::TimeProc(UINT uID,UINT uMsg, DWORD dwUser,DWORD dw1,DWORD dw2)
{
  Form1->Label1->Caption = Now();
}
// ---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
  TimerID = timeSetEvent(1000, 0, (LPTIMECALLBACK)TimeProc, 0,
    TIME_PERIODICTIME_CALLBACK_FUNCTION); // 设定多媒体定时器,1000ms

  if(TimerID == 0)  {
    ShowMessage("创建失败");
  }
}
// ---------------------------------------------------------------------------
void __fastcall TForm1::FormCloseQuery(TObject *Sender, bool &CanClose)
{
  if(TimerID != 0)  {
    timeKillEvent(TimerID); // 释放定时器
  }
}
// ---------------------------------------------------------------------------

运行效果:点击按钮后,Label1开始显示时间
测试环境:BCB5 + WIN98

作者信息:
"Mao Yanwei(citiz)" <myw_fool@citiz.net>

Tags:一个 使用 多媒体

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