/// <summary>
/// 通过文件类型获取图标
/// </summary>
/// <param name="fileType"></param>
/// <param name="isLarge"></param>
/// <returns></returns>
public static System.Drawing.Icon GetIconByFileType(string fileType, bool isLarge)
{
if (fileType == null || fileType.Equals(string.Empty))
{
return(null);
}
RegistryKey regVersion = null;
string regFileType = null;
string regIconString = null;
string systemDirectory = Environment.SystemDirectory;
if (fileType[0] == '.')
{
//读系统注册表中文件类型信息
regVersion = Registry.ClassesRoot.OpenSubKey(fileType, true);
if (regVersion != null)
{
regFileType = regVersion.GetValue("") as string;
regVersion.Close();
regVersion = Registry.ClassesRoot.OpenSubKey(regFileType + @"\DefaultIcon", true);
if (regVersion != null)
{
regIconString = regVersion.GetValue("") as string;
regVersion.Close();
}
}
if (regIconString == null)
{
//没有读取到文件类型注册信息，指定为未知文件类型的图标
regIconString = System.IO.Path.Combine(systemDirectory, "shell32.dll,0");
}
}
else
{
//直接指定为文件夹图标
regIconString = System.IO.Path.Combine(systemDirectory, "shell32.dll,3");
}
string[] fileIcon = regIconString.Split(new char[] { ',' });
if (fileIcon.Length != 2)
{
//系统注册表中注册的标图不能直接提取，则返回可执行文件的通用图标
fileIcon = new string[] { System.IO.Path.Combine(systemDirectory, "shell32.dll"), "2" };
}
System.Drawing.Icon resultIcon = null;
try
{
//调用API方法读取图标
int[] phiconLarge = new int[1];
int[] phiconSmall = new int[1];
uint count = FileApi.ExtractIconEx(fileIcon[0], Int32.Parse(fileIcon[1]), phiconLarge, phiconSmall, 1);
IntPtr IconHnd = new IntPtr(isLarge ? phiconLarge[0] : phiconSmall[0]);
resultIcon = System.Drawing.Icon.FromHandle(IconHnd);
}
catch { }
return(resultIcon);
}
/// <summary>
/// 通过文件名获取图标
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
public static System.Drawing.Icon GetIconByFileName(string fileName)
{
if (fileName == null || fileName.Equals(string.Empty))
{
return(null);
}
if (!System.IO.File.Exists(fileName))
{
return(null);
}
FileApi.SHFILEINFO shinfo = new FileApi.SHFILEINFO();
FileApi.SHGetFileInfo(fileName, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), FileApi.SHGFI_ICON | FileApi.SHGFI_SMALLICON);
System.Drawing.Icon myIcon = System.Drawing.Icon.FromHandle(shinfo.hIcon);
return(myIcon);
}
