DestoryIcon函数介绍

Destroys an icon and frees any memory the icon occupied.

销毁一个图标并且释放该图标所占用的内存；

语法说明（Syntax）

BOOL WINAPI DestroyIcon( __in HICON hIcon);

在C#.Net中的使用方法为 ：

[DllImport("user32.dll", EntryPoint = "DestroyIcon")]

private static extern bool DestroyIcon(IntPtr handle);

参数（Parameters）

hIcon [in] 图标的句柄

Type: HICON

A handle to the icon to be destroyed. The icon must not be in use.

将要被销毁的图标的句柄，并且该图标不能正在被使用

返回值（Return value）

Type: BOOL布尔值

If the function succeeds, the return value is nonzero.如果销毁图标成功则返回值为true;

If the function fails, the return value is zero. To get extended error information, call GetLastError.

如果销毁图标失败返回值为false；

附注（Remarks）

It is only necessary to call DestroyIcon for icons and cursors created with the following functions: CreateIconFromResourceEx (if called without the LR_SHARED flag), CreateIconIndirect, and CopyIcon. Do not use this function to destroy a shared icon. A shared icon is valid as long as the module from which it was loaded remains in memory. The following functions obtain a shared icon.

LoadIconLoadImage (if you use the LR_SHARED flag) CopyImage (if you use the LR_COPYRETURNORG flag and the hImage parameter is a shared icon) CreateIconFromResourceCreateIconFromResourceEx (if you use the LR_SHARED flag)

范例（Examples）

//调用SHGetFileInfo获取文件信息

[DllImport("Shell32.dll")]

private static extern int SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbFileInfo, uint uFlags);

//包含文件信息的结构

public struct SHFILEINFO

{

public IntPtr hIcon;

public int iIcon;

public uint dwAttributes;

public char szDisplayName;

public char szTypeName;

}

[DllImport("user32.dll", EntryPoint = "DestroyIcon")]

private static extern bool DestroyIcon(IntPtr handle);

/// <summary>

/// 获取文件的图标

/// </summary>

/// <param name="imagelist"></param>

/// <param name="filename"></param>

/// <param name="tf"></param>

public void SetIcon(ImageList imagelist, string filename, bool tf)

{

SHFILEINFO sfi = new SHFILEINFO();

int ntotal = 0;

if (tf)

{

//SHGFI_ICON|SHGFI_SMALLICON

ntotal = (int)SHGetFileInfo(filename, 0, ref sfi, 100, 16640);

try

{

if (ntotal > 0)

{

Icon ico = Icon.FromHandle(sfi.hIcon);

imagelist.Images.Add(ico);

DestroyIcon(sfi.hIcon);

}

}

catch (Exception e)

{ MessageBox.Show(e.ToString(), "错误提示：", 0, MessageBoxIcon.Error); }

}

else

{

ntotal = (int)SHGetFileInfo(filename, 0, ref sfi, 100, 257);

try

{

if (ntotal > 0)

{

Icon ico = Icon.FromHandle(sfi.hIcon);

imagelist.Images.Add(ico);

DestroyIcon(sfi.hIcon);

}

}

catch (Exception e)

{ MessageBox.Show(e .ToString (),"错误提示：",0,MessageBoxIcon.Error ); }

}

}