Get Volume Path from Drive Name using Powershell script
November 11, 2014 by Morgan
I have been working with file access events in Clustered File Server. In event log, for every file access, we are getting 4663 and 4656 events with file path like: DeviceHarddiskVolume4MySharetest.txt instead of my local path F:MySharetest.txt. After I have analyzed , found the prefix path DeviceHarddiskVolume4 is mapped with the device F:. Finally, I found this link (http://poshcode.org/4768), it contains powershell script to list Device Name (Drive letter) and mapped Device Path (Volume Path).
List Device Name and Volume Path
Get Volume Path from Device Name (Drive Letter)
List Device Name and Volume Path using Powershell script
We can get the Volume Path from Device Name using the Kernel32 module function QueryDosDevice and we can list the available device names (drive letter) using WMI class Win32_Volume. Use the the below Powershell script to list device path and device name.
1. Copy the below Powershell script and paste in Notepad file.
2. Save As the Notepad file with the extension .ps1 like List-Device-Name-and-Path.ps1
3. Now run the script file List-Device-Name-and-Path.ps1 from Powershell to list all the Device Name and Volume Path in local machine.
Get Device Path from Device Name using Powershell script
Get Device Path from Device Name (Drive Letter) using Powershell script
The below script displays Device Path for the given Device Name(Derive letter). The device name(drive letter) cannot have a trailing backslash; for example, use “C:“, not “C:“. Follow the below steps to get volume path from drive letter.
1. Copy the below Powershell script and paste in Notepad file.
2. Save As the Notepad file with the extension .ps1 like Get-DevicePath-from-DeviceName.ps1
3. Now run the script file Get-DevicePath-from-DeviceName.ps1 from Powershell, and give the Drive letter as argument which you want to get device path.
B. Minimum：控制項的sizeHint為控制項的最小尺寸。控制項不能小於這個sizeHint，但是可以
放大。
C. Maximum：控制項的sizeHint為控制項的最大尺寸，控制項不能放大，但是可以縮小到它的最小
的允許尺寸。
D. Preferred：控制項的sizeHint是它的sizeHint，但是可以放大或者縮小
E. Expandint：控制項可以自行增大或者縮小
註：sizeHint（布局管理中的控制項默認尺寸，如果控制項不在布局管理中就為無效的值）
1.QHBoxLayout是水平布局，將從左往右（orright to left for right-to-left languages ）widget布局成水平行
2.QVBoxLayout是垂直布局，從頂部到底部
3.QGridLayout 是二位的網格布局。它可以容納多個單元格：
4.QFormLayout是兩列label-field式的表單布局
代碼舉例：
下面代碼創建QHBoxLayout來管理5個QPushButtons的幾何圖形：
QWidget *window= new QWidget;
QPushButton *button1= new QPushButton("One");
QPushButton *button2= new QPushButton("Two");
QPushButton *button3= new QPushButton("Three");
QPushButton *button4= new QPushButton("Four");
QPushButton *button5= new QPushButton("Five");
QHBoxLayout *layout= new QHBoxLayout;
layout->addWidget(button1);
layout->addWidget(button2);
layout->addWidget(button3);
layout->addWidget(button4);
layout->addWidget(button5);
window->setLayout(layout);
window->show();
QGridLayout示例如下：
QWidget *window = new QWidget;
QPushButton *button1 = new QPushButton("One");
QPushButton *button2 = new QPushButton("Two");
QPushButton *button3 = new QPushButton("Three");
QPushButton *button4 = new QPushButton("Four");
QPushButton *button5 = new QPushButton("Five");
QGridLayout *layout = new QGridLayout;
layout->addWidget(button1, 0, 0);
layout->addWidget(button2, 0, 1);
layout->addWidget(button3, 1, 0, 1, 2);
layout->addWidget(button4, 2, 0);
layout->addWidget(button5, 2, 1);
window->setLayout(layout);
window->show();
QFormLayout示例如下：
QWidget *window = new QWidget;
QPushButton *button1 = new QPushButton("One");
QLineEdit *lineEdit1 = new QLineEdit();
QPushButton *button2 = new QPushButton("Two");
QLineEdit *lineEdit2 = new QLineEdit();
QPushButton *button3 = new QPushButton("Three");
QLineEdit *lineEdit3 = new QLineEdit();
QFormLayout *layout = new QFormLayout;
layout->addRow(button1, lineEdit1);
layout->addRow(button2, lineEdit2);
layout->addRow(button3, lineEdit3);
window->setLayout(layout);
window->show();
The use of rich text in a label widget can introduce some problemsto the layout of its parent widget. Problems occur due to the way rich text ishandled by Qt's layout managers when the label is word wrapped.
Incertain cases the parent layout is put into QLayout::FreeResize mode, meaningthat it will not adapt the layout of its contents to fit inside small sizedwindows, or even prevent the user from making the window too small to beusable. This can be overcome by subclassing the problematic widgets, andimplementing suitable sizeHint() andminimumSizeHint() functions.
Insome cases, it is relevant when a layout is added to a widget. When you set thewidget of a QDockWidget ora QScrollArea (with QDockWidget::setWidget() andQScrollArea::setWidget()), the layout mustalready have been set on the widget. If not, the widget will not be visible.
在一些情況下，當布局被添加到widget時需要特別注意。當設置QDockWidget ora QScrollArea widget時（用QDockWidget::setWidget() andQScrollArea::setWidget())，布局必須已經被設置到widget上。否則，這些widget將不可見。
頭文件
card.h
#ifndef CARD_H
#define CARD_H
#include <QtGui>
#include <QList>
class CardLayout : public QLayout
{
public:
CardLayout(QWidget *parent, int dist): QLayout(parent, 0, dist) {}
CardLayout(QLayout *parent, int dist): QLayout(parent, dist) {}
CardLayout(int dist): QLayout(dist) {}
~CardLayout();
void addItem(QLayoutItem *item);
QSize sizeHint() const;
QSize minimumSize() const;
int count() const;
QLayoutItem *itemAt(int) const;
QLayoutItem *takeAt(int);
void setGeometry(const QRect &rect);
private:
QList<QLayoutItem*> list;
};
#endif
實現文件
card.cpp
#include "card.h"
int CardLayout::count() const
{
// QList::size() returns the number of QLayoutItems in the list
return list.size();
}
int CardLayout::count() const
{
// QList::size() returns the number of QLayoutItems in the list
return list.size();
}
int CardLayout::count() const
{
// QList::size() returns the number of QLayoutItems in the list
return list.size();
}
CardLayout::~CardLayout()
{
QLayoutItem *item;
while ((item = takeAt(0)))
delete item;
}
void CardLayout::setGeometry(const QRect &r)
{
QLayout::setGeometry(r);
if (list.size() == 0)
return;
int w = r.width() - (list.count() - 1) * spacing();
int h = r.height() - (list.count() - 1) * spacing();
int i = 0;
while (i < list.size()) {
QLayoutItem *o = list.at(i);
QRect geom(r.x() + i * spacing(), r.y() + i * spacing(), w, h);
o->setGeometry(geom);
++i;
}
}
QSize CardLayout::sizeHint() const
{
QSize s(0,0);
int n = list.count();
if (n > 0)
s = QSize(100,70); //start with a nice default size
int i = 0;
while (i < n) {
QLayoutItem *o = list.at(i);
s = s.expandedTo(o->sizeHint());
++i;
}
return s + n*QSize(spacing(), spacing());
}
QSize CardLayout::minimumSize() const
{
QSize s(0,0);
int n = list.count();
int i = 0;
while (i < n) {
QLayoutItem *o = list.at(i);
s = s.expandedTo(o->minimumSize());
++i;
}
return s + n*QSize(spacing(), spacing());
}
