private static extern Boolean GetVersionEx_Ref_Blit(OSVersionInfoEx_Ref_Blit versionInfor);
public void PerfTest(Int32 testIterations)
{
Console.WriteLine("Test Iteration for each type: {0}", testIterations);
// 1. Non-blittable reference type
// Start with a fresh managed heap
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
// Start time
DateTime start = DateTime.Now;
// Create the marshalled instance and perform calls
OSVersionInfoEx_Ref_NonBlit info_ref_nonblit = new OSVersionInfoEx_Ref_NonBlit();
for (Int32 index = 0; index < testIterations; index++)
{
// We will not user wrapper method so that we can test on pure performance
// WrapperGetVersionEx_Ref_NonBlit(info_ref_nonblit);
GetVersionEx_Ref_NonBlit(info_ref_nonblit);
}
// End time
TimeSpan span = DateTime.Now - start;
// Output results
Console.WriteLine("Non-blittable reference type marshalling took: \t{0} secs", span.TotalSeconds);
// 2. Blittalbe reference type
// Start with a fresh managed heap
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
// Start time
start = DateTime.Now;
// Create the marshalled instance and perform calls
OSVersionInfoEx_Ref_Blit info_ref_blit = new OSVersionInfoEx_Ref_Blit();
for (Int32 index = 0; index < testIterations; index++)
{
// We will not user wrapper method so that we can test on pure performance
// WrapperGetVersionEx_Ref_Blit(info_ref_blit);
GetVersionEx_Ref_Blit(info_ref_blit);
}
// End time
span = DateTime.Now - start;
// Output results
Console.WriteLine("Blittable reference type marshalling took: \t{0} secs", span.TotalSeconds);
// 3. Non-blittalbe value type
// Start with a fresh managed heap
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
// Start time
start = DateTime.Now;
// Create the marshalled instance and perform calls
OSVersionInfoEx_Val_NonBlit info_val_nonblit = new OSVersionInfoEx_Val_NonBlit();
// If we use the wrapper method, the next statement is not necessary, since the wrapper method will do the stuff.
info_val_nonblit.OSVersionInfoSize = (UInt32)Marshal.SizeOf(typeof(OSVersionInfoEx_Val_NonBlit));
for (Int32 index = 0; index < testIterations; index++)
{
// We will not user wrapper method so that we can test on pure performance
// WrapperGetVersionEx_Val_NonBlit(out info_val_nonblit);
GetVersionEx_Val_NonBlit(ref info_val_nonblit);
}
// End time
span = DateTime.Now - start;
// Output results
Console.WriteLine("Non-blittable value type marshalling took : \t{0} secs", span.TotalSeconds);
// 4. Blittalbe value type
// Start with a fresh managed heap
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
// Start time
start = DateTime.Now;
// Create the marshalled instance and perform calls
OSVersionInfoEx_Val_Blit info_val_blit = new OSVersionInfoEx_Val_Blit();
// If we use the wrapper method, the next statement is not necessary, since the wrapper method will do the stuff.
info_val_blit.OSVersionInfoSize = (UInt32)Marshal.SizeOf(typeof(OSVersionInfoEx_Val_Blit));
for (Int32 index = 0; index < testIterations; index++)
{
// We will not user wrapper method so that we can test on pure performance
// WrapperGetVersionEx_Val_Blit(out info_val_blit);
GetVersionEx_Val_Blit(ref info_val_blit);
}
// End time
span = DateTime.Now - start;
// Output results
Console.WriteLine("Blittable value type marshalling took : \t{0} secs", span.TotalSeconds);
// Dump version info
Console.WriteLine("{0}Current system version information:", Environment.NewLine);
Console.WriteLine("OSVersionInfoSize: \t{0}", info_val_blit.OSVersionInfoSize);
Console.WriteLine("MajorVersion: \t\t{0}", info_val_blit.MajorVersion);
Console.WriteLine("MinorVersion: \t\t{0}", info_val_blit.MinorVersion);
Console.WriteLine("BuildNumber: \t\t{0}", info_val_blit.BuildNumber);
Console.WriteLine("PlatformId: \t\t{0}", info_val_blit.PlatformId);
Console.WriteLine("CSDVersion: \t\t{0}", info_val_blit.CSDVersion);
Console.WriteLine("ServicePackMajor: \t{0}", info_val_blit.ServicePackMajor);
Console.WriteLine("ServicePackMinor: \t{0}", info_val_blit.ServicePackMinor);
Console.WriteLine("SuiteMask: \t\t{0}", info_val_blit.SuiteMask);
Console.WriteLine("ProductType: \t\t{0}", info_val_blit.ProductType);
Console.WriteLine("Reserved: \t\t{0}", info_val_blit.Reserved);
Console.WriteLine();
}
/// <summary>
/// ���Ƕ�Win32 API����GetVersionEx���з�װ��İ�װ����
/// </summary>
/// <param name="type"></param>
public void WrapperGetVersionEx_Ref_Blit(OSVersionInfoEx_Ref_Blit versionInfo)
{
if (!GetVersionEx_Ref_Blit(versionInfo))
{
// ���ʧ�ܣ�������Ĵ����룬���׳���Ӧ��Win32�쳣
Int32 err = Marshal.GetLastWin32Error();
throw new Win32Exception(err);
}
}