各位大佬麻烦帮忙看一下,放了一个static text的控件,在对话框中添加了下拉框的消息的处理函数,想要调用UpdateData(FALSE)函数将变量m_DriveType的值更新到界面上,但是运行后什么都没有。。
// File1Dlg.cpp : 实现文件
//
#include "stdafx.h"
#include "File1.h"
#include "File1Dlg.h"
#include "afxdialogex.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
// 用于应用程序“关于”菜单项的 CAboutDlg 对话框
class CAboutDlg : public CDialogEx
{
public:
CAboutDlg();
// 对话框数据
enum { IDD = IDD_ABOUTBOX };
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV 支持
// 实现
protected:
DECLARE_MESSAGE_MAP()
};
CAboutDlg::CAboutDlg() : CDialogEx(CAboutDlg::IDD)
{
}
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialogEx::DoDataExchange(pDX);
}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()
// CFile1Dlg 对话框
CFile1Dlg::CFile1Dlg(CWnd* pParent /*=NULL*/)
: CDialogEx(CFile1Dlg::IDD, pParent)
, m_DriverType(_T(""))
{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CFile1Dlg::DoDataExchange(CDataExchange* pDX)
{
CDialogEx::DoDataExchange(pDX);
DDX_Control(pDX, IDC_COMBO1, m_drive);
DDX_Text(pDX, IDC_STATIC1, m_DriverType);
}
BEGIN_MESSAGE_MAP(CFile1Dlg, CDialogEx)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_OK, &CFile1Dlg::OnBnClickedOk)
ON_CBN_SELCHANGE(IDC_COMBO1, &CFile1Dlg::OnCbnSelchangeComboDrive)
END_MESSAGE_MAP()
// CFile1Dlg 消息处理程序
BOOL CFile1Dlg::OnInitDialog()
{
CDialogEx::OnInitDialog();
// 将“关于...”菜单项添加到系统菜单中。
// IDM_ABOUTBOX 必须在系统命令范围内。
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);
CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
BOOL bNameValid;
CString strAboutMenu;
bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
ASSERT(bNameValid);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}
// 设置此对话框的图标。当应用程序主窗口不是对话框时,框架将自动
// 执行此操作
SetIcon(m_hIcon, TRUE); // 设置大图标
SetIcon(m_hIcon, FALSE); // 设置小图标
// TODO: 在此添加额外的初始化代码
//第一次调用
size_t alldrive=::GetLogicalDriveStrings(0,NULL);
_TCHAR *driverstr;
driverstr=new _TCHAR[alldrive+sizeof(_T(""))];
//printf("AllDrivesize is: %d\r\n",alldrive);
//第二次调用
size_t twosize=GetLogicalDriveStrings(alldrive,driverstr);
CString DriveLetter;
for(int i=0;i<alldrive/4;i++)
{
DriveLetter=driverstr+i*4;
m_drive.InsertString(i,DriveLetter.GetBuffer());
}
m_drive.SetCurSel(0);
return TRUE; // 除非将焦点设置到控件,否则返回 TRUE
}
void CFile1Dlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialogEx::OnSysCommand(nID, lParam);
}
}
// 如果向对话框添加最小化按钮,则需要下面的代码
// 来绘制该图标。对于使用文档/视图模型的 MFC 应用程序,
// 这将由框架自动完成。
void CFile1Dlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // 用于绘制的设备上下文
SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);
// 使图标在工作区矩形中居中
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;
// 绘制图标
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialogEx::OnPaint();
}
}
//当用户拖动最小化窗口时系统调用此函数取得光标
//显示。
HCURSOR CFile1Dlg::OnQueryDragIcon()
{
return static_cast<HCURSOR>(m_hIcon);
}
void CFile1Dlg::OnBnClickedOk()
{
// TODO: 在此添加控件通知处理程序代码
CString strDrive;
m_drive.GetWindowTextW(strDrive);
this->MessageBox(strDrive.GetBuffer());
OnOK();
}
void CFile1Dlg::OnCbnSelchangeComboDrive()
{
// TODO: 在此添加控件通知处理程序代码
CString m_DriveType;
CString strDrive;
int now=m_drive.GetCurSel();
m_drive.GetLBText(now,strDrive);
// not
// m_Drive.GetWindowText(strDrive);
int retCode = ::GetDriveType(strDrive);
switch (retCode)
{
case DRIVE_UNKNOWN:
m_DriveType = "驱动器类型:未知";
break;
case DRIVE_NO_ROOT_DIR:
m_DriveType = "类型:驱动器根路径错误";
break;
case DRIVE_REMOVABLE:// 2
m_DriveType = "类型:可移动磁盘驱动器";
break;
case DRIVE_FIXED:// 3
m_DriveType = "类型:固定磁盘驱动器";
break;
case DRIVE_REMOTE:
m_DriveType = "类型:网络磁盘驱动器";
break;
case DRIVE_CDROM:
m_DriveType = "类型:CD-ROM";
break;
case DRIVE_RAMDISK:
m_DriveType = "类型:RAM";
break;
default:
m_DriveType = "类型:未知";
break;
}
UpdateData(FALSE);
}
ps.变量类型是value还是control会影响UpdateData(FALSE)的调用吗??