public IconExtractor(string filename)
{
if (filename == null)
{
throw new ArgumentNullException("filename");
}
this._hModule = NativeMethods.LoadLibrary(filename);
if (this._hModule == IntPtr.Zero)
{
this._hModule = NativeMethods.LoadLibraryEx(filename, IntPtr.Zero, LOAD_LIBRARY_AS_DATAFILE);
if (this._hModule == IntPtr.Zero)
{
switch (Marshal.GetLastWin32Error())
{
case ERROR_FILE_NOT_FOUND:
throw new FileNotFoundException("Specified file '" + filename + "' not found.");
case ERROR_BAD_EXE_FORMAT:
throw new ArgumentException("Specified file '" + filename + "' is not an executable file or DLL.");
default:
throw new Win32Exception();
}
}
}
StringBuilder buf = new StringBuilder(MAX_PATH);
int len = NativeMethods.GetModuleFileName(this._hModule, buf, buf.Capacity + 1);
int LastError = Marshal.GetLastWin32Error();
if (len != 0)
{
this._filename = buf.ToString();
}
else
{
switch (LastError)
{
case ERROR_SUCCESS:
this._filename = filename;
break;
default:
throw new Win32Exception();
}
}
this._resInfo = new NativeMethods.IconResInfo();
bool success = NativeMethods.EnumResourceNames(this._hModule, RT_GROUP_ICON, EnumResNameCallBack, this._resInfo);
// bool EnumResourceNames(IntPtr hModule, int lpszType, EnumResNameProc lpEnumFunc, IconResInfo lParam);
if (!success)
{
throw new Win32Exception();
}
this._iconCache = new Icon[this.IconCount];
}
private bool EnumResNameCallBack(IntPtr hModule, int lpszType, IntPtr lpszName, NativeMethods.IconResInfo lParam)
{
// Callback function for EnumResourceNames().
if (lpszType == RT_GROUP_ICON)
{
lParam.IconNames.Add(new NativeMethods.ResourceName(lpszName));
}
return(true);
}
