/// <summary>
/// Extract all icons from a file
/// </summary>
/// <param name="path">File path</param>
/// <param name="isLarge">Large (32x32) or Small (16x16) icon</param>
/// <returns>Icon[] array</returns>
public static Icon[] ExtractIconsFromFile(string path, bool isLarge)
{
path = Environment.ExpandEnvironmentVariables(path);
int iconsCount = (int)GetTotalIcons(path);
//checks how many icons.
IntPtr[] iconPtr = new IntPtr[iconsCount];
//extracts the icons by the size that was selected.
uint readIconCount = isLarge ? Shell32.ExtractIconEx(path, 0, iconPtr, null, iconsCount) : Shell32.ExtractIconEx(path, 0, null, iconPtr, iconsCount);
Icon[] iconList = new Icon[iconsCount];
//gets the icons in a list.
for (int i = 0; i < iconsCount; i++)
{
if (iconPtr[i] != IntPtr.Zero)
{
iconList[i] = GetManagedIcon(iconPtr[i]);
}
}
return(iconList);
}
/// <summary>
/// Extract the icon from file.
/// </summary>
/// <param name="path">File path,
/// such as ex: "C:\\Program Files\\NetMeeting\\conf.exe,1".</param>
/// <param name="isLarge">
/// Determines the returned icon is a large (may be 32x32 px)
/// or small icon (16x16 px).</param>
public static Icon ExtractIconFromFile(string path, bool isLarge)
{
IntPtr[] hDummy = new IntPtr[] { IntPtr.Zero };
IntPtr[] hIconEx = new IntPtr[] { IntPtr.Zero };
try
{
EmbeddedIconInfo embeddedIcon = GetEmbeddedIconInfo(Environment.ExpandEnvironmentVariables(path));
uint readIconCount = isLarge ? Shell32.ExtractIconEx(embeddedIcon.FileName, 0, hIconEx, hDummy, 1) : Shell32.ExtractIconEx(embeddedIcon.FileName, 0, hDummy, hIconEx, 1);
if (readIconCount > 0 && hIconEx[0] != IntPtr.Zero)
{
// Get first icon.
return(GetManagedIcon(hIconEx[0]));
}
else // No icon read
{
return(null);
}
}
catch (Exception exc)
{
// Extract icon error.
throw new ApplicationException("Could not extract icon", exc);
}
finally
{
// Release resources.
foreach (IntPtr ptr in hIconEx)
{
if (ptr != IntPtr.Zero)
{
User32.DestroyIcon(ptr);
}
}
foreach (IntPtr ptr in hDummy)
{
if (ptr != IntPtr.Zero)
{
User32.DestroyIcon(ptr);
}
}
}
}
/// <summary>
/// Get total icons on a file
/// </summary>
/// <param name="path">Path to a file</param>
/// <example>
/// <code>IconReader.GetTotalIcons("C:\\Windows\\system32\\shell32.dll");</code>
/// </example>
/// <returns>Total icon on selected file</returns>
public static uint GetTotalIcons(string path)
{
return(Shell32.ExtractIconEx(Environment.ExpandEnvironmentVariables(path), -1, null, null, 0));
}
