为什么这段代码无法将元数据设置为tif图像，但它可以将元数据设置为jpg？

Question

我已经实现了本文中的代码：

how to read write metadata using GDI

将元数据保存到jpg时效果很好，但是当我保存到tif时，我没有获得元数据。

问题是什么，如何解决？

此代码可以向jpg mage添加新的元数据：

#include <windows.h>
#include <gdiplus.h>
#include <stdio.h>
using namespace Gdiplus;
INT main()
{
   // Initialize <tla rid="tla_gdiplus"/>.
   GdiplusStartupInput gdiplusStartupInput;
   ULONG_PTR gdiplusToken;
   GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
   Status stat;
   CLSID  clsid;
   char   propertyValue[] = "Fake Photograph";
   Bitmap* bitmap = new Bitmap(L"FakePhoto.jpg");
   PropertyItem* propertyItem = new PropertyItem;
   // Get the CLSID of the JPEG encoder.
   GetEncoderClsid(L"image/jpeg", &clsid);
   propertyItem->id = PropertyTagImageTitle;
   propertyItem->length = 16;  // string length including NULL terminator
   propertyItem->type = PropertyTagTypeASCII; 
   propertyItem->value = propertyValue;
   bitmap->SetPropertyItem(propertyItem);
   stat = bitmap->Save(L"FakePhoto2.jpg", &clsid, NULL);
   if(stat == Ok)
      printf("FakePhoto2.jpg saved successfully.\n");

   delete propertyItem;
   delete bitmap;
   GdiplusShutdown(gdiplusToken);
   return 0;
}

但是这段代码不起作用：

#include <windows.h>
#include <gdiplus.h>
#include <stdio.h>
using namespace Gdiplus;
INT main()
{
   // Initialize <tla rid="tla_gdiplus"/>.
   GdiplusStartupInput gdiplusStartupInput;
   ULONG_PTR gdiplusToken;
   GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
   Status stat;
   CLSID  clsid;
   char   propertyValue[] = "Fake Photograph";
   Bitmap* bitmap = new Bitmap(L"FakePhoto.jpg");
   PropertyItem* propertyItem = new PropertyItem;
   // Get the CLSID of the JPEG encoder.
   GetEncoderClsid(L"image/tiff", &clsid);
   propertyItem->id = PropertyTagImageTitle;
   propertyItem->length = 16;  // string length including NULL terminator
   propertyItem->type = PropertyTagTypeASCII; 
   propertyItem->value = propertyValue;
   bitmap->SetPropertyItem(propertyItem);
   stat = bitmap->Save(L"FakePhoto2.tif", &clsid, NULL);
   if(stat == Ok)
      printf("FakePhoto2.jpg saved successfully.\n");

   delete propertyItem;
   delete bitmap;
   GdiplusShutdown(gdiplusToken);
   return 0;
}

区别在于解码器和图像名称。为什么它不起作用？