從PE檔案格式入手。檢查 IMAGE_FILE_HEADER 中的machine成員即可

 int __stdcall CrnGetImageFileMachine(LPCSTR lpFileName)

 {
     IMAGE_DOS_HEADER idh;
     FILE *f = fopen(lpFileName, "rb");
     fread(&idh, sizeof(idh), 1, f);
     IMAGE_FILE_HEADER ifh;
     fseek(f, idh.e_lfanew + 4, SEEK_SET);
     fread(&ifh, sizeof(ifh), 1, f);
     fclose(f);
     return ifh.Machine;

 }

 void CtestDlg::OnTestprot()
 {
     // TODO: Add your control notification handler code here
     int n = CrnGetImageFileMachine("D:\\W32N55.dll");
     if (n == 0x014C)
         MessageBox("x86");
     else if (n == 0x0200)
         MessageBox("IA64");
     else if (n == 0x8664)
         MessageBox("x64");
     else MessageBox("未知型別");
 }