form1.cs

用P/Invoke显示设备内存信息 P/Invoke with compact framework get the Memory Status and Storage Cards

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Runtime.InteropServices;

namespace GetStorageCard
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show(DeviceMemoryInfo.FreeBytesAvailable.ToString() + "Total free:" + DeviceMemoryInfo.TotalFreeBytes + "Total bytes" + DeviceMemoryInfo.TotalBytes, "for Windows");
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.grpStorage.Text = "Memory Space View";
            this.progressBar21.Maximum = 100;
            this.progressBar21.Minimum = 0;
            this.progressBar21.DrawStyle = OpenNETCF.Windows.Forms.DrawStyle.Gradient;
            DisplayMemorySattus();
        }

        private void DisplayMemorySattus()
        {
            try
            {
                long percentage = Math.Abs((DeviceMemoryInfo.FreeBytesAvailable * 100) / DeviceMemoryInfo.TotalBytes);
                this.progressBar21.Value = (int)percentage;

                double dvalue = Math.Round(Convert.ToDouble(DeviceMemoryInfo.TotalBytes / 1048576.0), 2);
                this.lblTotal.Text = "TotalStorage : " + dvalue.ToString() + " MB";

                long usedinKb = DeviceMemoryInfo.TotalBytes - DeviceMemoryInfo.FreeBytesAvailable;
                double usedinMB = Math.Round(Convert.ToDouble(usedinKb / 1048576.0), 2);
                this.lblUsed.Text = "Used Size : " + usedinMB.ToString() + " MB";
            }
            catch (DivideByZeroException dex)
            {
                MessageBox.Show(dex.Message, "Error");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error");
            }
        }

        private void button21_Click(object sender, EventArgs e)
        {
            this.DisplayMemorySattus();
        }
    }
}