日期：2011-03-22 13:55:00 来源：本站整理

操纵子类化技术为DBGrid增添鼠标转动[VC/C++编程]

赞助商链接

分享到： QQ空间新浪微博腾讯微博人人网

本文“操纵子类化技术为DBGrid增添鼠标转动[VC/C++编程]”是由七道奇为您精心收集，来源于网络转载，文章版权归文章作者所有，本站不对其观点以及内容做任何评价，请读者自行判断，以下是其具体内容：

作者:yifei(尹加俊)

信箱:yifei1900@163.com

为DBGrid增添鼠标转动功效的演示,核心代码以下:

//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "MainFormUnit.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TMainForm *MainForm;
//---------------------------------------------------------------------------
FARPROC OldProc = NULL; //用于保存旧的DBGrid控件的WindowProc
//---------------------------------------------------------------------------
/**
* 声明新的DBGrid的WindowProc
*/
LRESULT CALLBACK DBGridProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
//处理感爱好的Window消息
if(uMsg == WM_MOUSEWHEEL) {
if((short)HIWORD(wParam) > 0) {
::PostMessage(hWnd,WM_VSCROLL,SB_LINEUP,0);
} else {
::PostMessage(hWnd,WM_VSCROLL,SB_LINEDOWN,0);
}
}
//调用原DBGrid的WindowProc
return (::CallWindowProc(OldProc,hWnd,uMsg,wParam,lParam));
}
//---------------------------------------------------------------------------
__fastcall TMainForm::TMainForm(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TMainForm::FormShow(TObject *Sender)
{
this->ADOCn->ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="
+ ExtractFilePath(Application->ExeName) + "Data.mdb;Persist Security Info=True";
this->ADOCn->Connected = true;
this->DataSet->Open();
//设置新的窗体函数
OldProc = (FARPROC)::SetWindowLong(this->DBGrid->Handle,GWL_WNDPROC,(long)DBGridProc);
}
//---------------------------------------------------------------------------
void __fastcall TMainForm::FormClose(TObject *Sender, TCloseAction &Action)
{
//复原窗体函数
::SetWindowLong(this->DBGrid->Handle,GWL_WNDPROC,(long)OldProc);
this->ADOCn->Connected = false;
}
//---------------------------------------------------------------------------