在使用VC编写基于MFC的对话框程序时，经常要将窗口在最大化和默认窗体之间进行切换，默认情况下点击最大化按钮后，对话框会全屏，但是里面的组件却没有按相同比例放大。以下给出实现的相关代码。
//最大化，获取当前对话框大小
CRect rectDlg;
::GetWindowRect(m_hWnd,rectDlg); //该函数返回指定窗口的边框矩形的尺寸。
//以相对于屏幕坐标左上角的屏幕坐标给出
// m_hWnd是当前对话框句柄，在头文件定义
m_intDlgWidth = rectDlg.right - rectDlg.left;
m_intDlgHeight = rectDlg.bottom - rectDlg.top;
//SM_CXSCREEN,SM_CYSCREEN 以像素为单位计算的屏幕尺寸。
m_nWidth = GetSystemMetrics(SM_CXSCREEN);
m_nHeight = GetSystemMetrics(SM_CYSCREEN);
m_floatMultipleWidth = float(m_nWidth)/float(m_intDlgWidth);
m_floatMultipleHeight = float(m_nHeight)/float(m_intDlgHeight);
int i;
for (i = 1000;i <= 1004; ++i)
{
//将当前对话框中的控件尺寸和按比例放大后的尺寸保存起来。
//（1000~1004为控件ID号，下同。）
SaveSize(i);
}
for (i = 1007;i <= 1008; ++i)
{
SaveSize(i);
}
for (i = 1010;i <= 1022; ++i)
{
SaveSize(i);
}
for (i = 1024;i <= 1030; ++i)
{
SaveSize(i);
}
for (i = 1035;i <= 1052; ++i)
{
SaveSize(i);
}
for (i = 1055;i <= 1058; ++i)
{
SaveSize(i);
}
for (i = 1060;i <= 1076; ++i)
{
SaveSize(i);
}
for (i = 1078;i <= 1098; ++i)
{
SaveSize(i);
}
for (i = 1103;i <= 1104; ++i)
{
SaveSize(i);
}
for (i =1112;i<= 1114; ++i)
{
SaveSize(i);
}
SaveSize(IDCANCEL);
// m_sizeInitFinish头文件中定义的BOOL变量，说明是否保存完对话框初始尺寸
m_sizeInitFinish = TRUE;
以上这段代码可以在对话框源程序的初始化部分（::OnInitDialog()）添加。
SaveSize(int nID)函数的实现如下：
BOOL CXXXXDlg::SaveSize(int nID)
{
CRect rect;
GetDlgItem(nID)->GetWindowRect(rect);
ScreenToClient(rect);//将屏幕坐标转换成用户坐标保存在rect中。
CPoint oldTLPoint,TLPoint;
oldTLPoint = rect.TopLeft();//默认对话框尺寸的左上角坐标
//最大化对话框左上角坐标
TLPoint.x = long(oldTLPoint.x * m_floatMultipleWidth);
TLPoint.y = long(oldTLPoint.y * m_floatMultipleHeight);
CPoint oldBRPoint,BRPoint;
oldBRPoint = rect.BottomRight();//默认对话框尺寸的右下角坐标
//最大化对话框左上角坐标
BRPoint.x = long(oldBRPoint.x * m_floatMultipleWidth);
BRPoint.y = long(oldBRPoint.y * m_floatMultipleHeight);
//下述代码作用是判断如果控件是CComboBox类型时，由于考虑到下拉框长//度，所以对纵坐标进行加长处理
if (IDC_COMBO_DS_PORT == nID)
{
BRPoint.y = BRPoint.y + 60;
oldBRPoint.y = oldBRPoint.y + 60;
}
if (IDC_COMBO_ML_PROT == nID)
{
BRPoint.y = BRPoint.y + 60;
oldBRPoint.y = oldBRPoint.y +60;
}
if (IDC_COMBO_SERIAL_NO == nID)
{
BRPoint.y = BRPoint.y + 60;
oldBRPoint.y = oldBRPoint.y +60;
}
if (IDC_COMBO_DATA_BITS== nID)
{
BRPoint.y = BRPoint.y + 60;
oldBRPoint.y = oldBRPoint.y + 60;
}
if (IDC_COMBO_STOP_BITS == nID)
{
BRPoint.y = BRPoint.y + 60;
oldBRPoint.y = oldBRPoint.y + 60;
}
if (IDC_COMBO_BAUD_RATE== nID)
{
BRPoint.y = BRPoint.y + 60;
oldBRPoint.y = oldBRPoint.y + 60;
}
if (IDC_COMBO_CHECK_BITS== nID)
{
BRPoint.y = BRPoint.y + 60;
oldBRPoint.y = oldBRPoint.y + 60;
}
//vector<CPoint> m_oldTLPoints;在头文件进行定义
m_oldTLPoints.push_back(oldTLPoint);
m_oldBRPoints.push_back(oldBRPoint);
m_newTLPoints.push_back(TLPoint);
m_newBRPoints.push_back(BRPoint);
return TRUE;
}
以下进行实现窗口的最大化（还原）触发事件：
void CXXXXXDlg::OnSize(UINT nType, int cx, int cy)
{
CDialog::OnSize(nType, cx, cy);
// TODO: 在此处添加消息处理程序代码
if (m_sizeInitFinish) //判断是否将尺寸保存起来了
{
//int m_maxFlag;头文件定义，判断是要进行最大化窗口，还是要将窗口还原。
m_maxFlag = m_maxFlag ^ 1;
int i,j = 0;
for (i = 1000;i <= 1004; ++i)
{
ReSize(i,j);//此函数的实现后续。
++j;
}
for (i = 1007;i <= 1008; ++i)
{
ReSize(i,j);
++j;
}
for (i = 1010;i <= 1022; ++i)
{
ReSize(i,j);
++j;
}
for (i = 1024;i <= 1030; ++i)
{
ReSize(i,j);
++j;
}
for (i = 1035;i <= 1052; ++i)
{
ReSize(i,j);
++j;
}
for (i = 1055;i <= 1058; ++i)
{
ReSize(i,j);
++j;
}
for (i = 1060;i <= 1076; ++i)
{
ReSize(i,j);
++j;
}
for (i = 1078;i <= 1098; ++i)
{
ReSize(i,j);
++j;
}
for (i = 1103;i <= 1104; ++i)
{
ReSize(i,j);
++j;
}
for (i =1112;i<= 1114; ++i)
{
ReSize(i,j);
++j;
}
ReSize(IDCANCEL,j);
}
}
ReSize(int nID,int j)函数的实现如下：
void CXXXXXDlg::ReSize(int nID,int j)
{
CRect rect;
CPoint TLPoint;
CPoint BRPoint;
if (m_maxFlag)
{
rect.SetRect(m_newTLPoints[j],m_newBRPoints[j]);
}
else
{
rect.SetRect(m_oldTLPoints[j],m_oldBRPoints[j]);
}
GetDlgItem(nID)->MoveWindow(rect,TRUE);
//以下代码是为一些自己实现的一些动态组件尺寸改变所编写的，根据个人
//情况可以去掉。
if (IDC_STATIC_CJ_AN_RESULT == nID)
{
vector<int> vwidth(16,(rect.right - rect.left)/16);
rect.right = rect.left + ((rect.right - rect.left) & (~0xf));
rect.top = rect.bottom - 40;
list2->MoveWindow(rect,TRUE);
rect.bottom = rect.bottom - 40;
rect.top = rect.bottom - 40;
list1->MoveWindow(rect,TRUE);
list1->ChangeColumnWidth(vwidth);
list2->ChangeColumnWidth(vwidth);
}
if (IDC_STATIC_CJ_BL_RESULT == nID)
{
vector<int> vwidth(16,(rect.right - rect.left)/16);
rect.right = rect.left + ((rect.right - rect.left) & (~0xf));
rect.top = rect.bottom - 40;
list3->MoveWindow(rect,TRUE);
list3->ChangeColumnWidth(vwidth);
}
if (IDC_STATIC_CJ_TH_RESULT == nID)
{
vector<int> vwidth(16,(rect.right - rect.left)/16);
rect.right = rect.left + ((rect.right - rect.left) & (~0xf));
rect.top = rect.bottom - 40;
list4->MoveWindow(rect,TRUE);
list4->ChangeColumnWidth(vwidth);
}
}