LARGE_INTEGER

#include <windows.h>

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR ipCmdLine,int nShowCmd)
{

 LARGE_INTEGER a,b;

    a.QuadPart = 100;

    a.QuadPart *= 10000000000000000;

    b.QuadPart = a.QuadPart;

    if(b.QuadPart > 1000)

 //   {

//  DbgPrint("b.QuadPart < 1000, LowPart = %d HighPart = %d", b.LowPart,b.HighPart);

 //   }

 

 return 0;
}

单独访问 a.QuadPart时整体，如果是32位自动放入低位中LowPart，超过后自动扩展到HighPart

可以去单独的也可以取到整体。