C#获取windows系统的图标

Posted on 2020-12-22 15:04  haishu  阅读(254)  评论(0编辑  收藏
这个获取关联图标,可以获取磁盘分区的图标,可以获取某个特定类型的文件的图标,也可以获取某个指定文件的图标
/// <summary> /// 保存文件信息的结构体 /// </summary> /// [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] struct SHFILEINFO { public IntPtr hIcon; public int iIcon; public uint dwAttributes; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)] public string szDisplayName; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)] public string szTypeName; } class NativeMethods { [DllImport("Shell32.dll", EntryPoint = "SHGetFileInfo", SetLastError = true, CharSet = CharSet.Auto)] public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbFileInfo, uint uFlags); [DllImport("User32.dll", EntryPoint = "DestroyIcon")] public static extern int DestroyIcon(IntPtr hIcon); #region API 参数的常量定义 public const uint SHGFI_ICON = 0x100; public const uint SHGFI_LARGEICON = 0x0; //大图标 32×32 public const uint SHGFI_SMALLICON = 0x1; //小图标 16×16 public const uint SHGFI_USEFILEATTRIBUTES = 0x10; #endregion } /// <summary> /// 获取文件类型的关联图标 /// </summary> /// <param name="fileName">文件类型的扩展名或文件的绝对路径</param> /// <param name="isLargeIcon">是否返回大图标</param> /// <returns>获取到的图标</returns> static Icon GetIcon(string fileName, bool isLargeIcon) { SHFILEINFO shfi = new SHFILEINFO(); IntPtr hI; if (isLargeIcon) hI = NativeMethods.SHGetFileInfo(fileName, 0, ref shfi, (uint)Marshal.SizeOf(shfi), NativeMethods.SHGFI_ICON | NativeMethods.SHGFI_USEFILEATTRIBUTES | NativeMethods.SHGFI_LARGEICON); else hI = NativeMethods.SHGetFileInfo(fileName, 0, ref shfi, (uint)Marshal.SizeOf(shfi), NativeMethods.SHGFI_ICON | NativeMethods.SHGFI_USEFILEATTRIBUTES | NativeMethods.SHGFI_SMALLICON); Icon icon = Icon.FromHandle(shfi.hIcon).Clone() as Icon; NativeMethods.DestroyIcon(shfi.hIcon); //释放资源 return icon; }

private void btnGetIcon_Click(object sender, EventArgs e)
{
    using (Graphics g = this.pbSmallIcon.CreateGraphics())
    {
        g.Clear(this.pbSmallIcon.BackColor); //清除picturebox的背景色,为了画透明图标

        g.DrawIcon(GetIcon(this.tbFileExt.Text, false), 1, 1); //绘制小图标
    }

    using (Graphics g = this.pbLargeIcon.CreateGraphics())
    {
        g.Clear(this.pbLargeIcon.BackColor); //清除picturebox的背景色,为了画透明图标

        g.DrawIcon(GetIcon(this.tbFileExt.Text, true), 1, 1); //绘制小图标
    }
}

 

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