pe中获得icon的大小,该如何解决

pe中获得icon的大小
image_resource_directory   =   new   (IMAGE_RESOURCE_DIRECTORY);
firstAdd   =   new   (IMAGE_RESOURCE_DIRECTORY);
dirSec   =   new   (IMAGE_RESOURCE_DIRECTORY);
dirThird   =   new   (IMAGE_RESOURCE_DIRECTORY);
entrySec   =   new   (IMAGE_RESOURCE_DIRECTORY_ENTRY);
entryThird   =   new   (IMAGE_RESOURCE_DIRECTORY_ENTRY);
entryData   =   new   (IMAGE_RESOURCE_DATA_ENTRY);

DWORD   dwOffset=RVA2Offset(image_nt_headers-> OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_RESOURCE].VirtualAddress);

image_resource_directory   =   (PIMAGE_RESOURCE_DIRECTORY)((char*)pMem   +   dwOffset);
image_resource_directory_entry   =   (PIMAGE_RESOURCE_DIRECTORY_ENTRY)(image_resource_directory   +   sizeof(image_resource_directory));

for   (i=0;i <image_resource_directory-> NumberOfIdEntries+image_resource_directory-> NumberOfNamedEntries;i++,image_resource_directory_entry   ++)
{
if(image_resource_directory_entry-> Id==3)
if   (image_resource_directory_entry-> OffsetToData&0x80000000)
{
image_resource_directory_entry-> OffsetToData&0x7fffffff;
dwOffset   =   RVA2Offset(image_resource_directory_entry-> OffsetToData);
dirSec   =   (PIMAGE_RESOURCE_DIRECTORY)(image_resource_directory   +   dwOffset);
entrySec   =   (PIMAGE_RESOURCE_DIRECTORY_ENTRY)(dirSec   +   sizeof(IMAGE_RESOURCE_DIRECTORY));
for(k=0;k <dirSec-> NumberOfIdEntries   +   dirSec-> NumberOfNamedEntries;k++,entrySec++)
{

if(entrySec-> OffsetToData&0x80000000)
entrySec-> OffsetToData&0x7fffffff;
dirThird   =   (PIMAGE_RESOURCE_DIRECTORY)(image_resource_directory   +   entrySec-> OffsetToData);
entryThird   =   (PIMAGE_RESOURCE_DIRECTORY_ENTRY)(dirThird   +   sizeof(IMAGE_RESOURCE_DIRECTORY));
dwOffset   =   RVA2Offset(entryThird-> OffsetToData);
entryData   =   (PIMAGE_RESOURCE_DATA_ENTRY)(image_resource_directory   +   dwOffset);
DWORD   dwIconSize=entryData-> Size;
}
}
}
我的目的是得到pe中icon的地址，我打开一个exe文件后得到icon（entryData）的size是0，而这个文件是有icon的，为什么？

------解决方案--------------------
或许该文件不是十分符合PE规范
或者你的程序定位错了