typedef struct _IMAGE_DOS_HEADER { // DOS .EXE header
WORD e_magic; // Magic number 固定为"MZ" 即， 4Dh 5Ah
WORD e_cblp; // Bytes on last page of file
WORD e_cp; // Pages in file
WORD e_crlc; // Relocations
WORD e_cparhdr; // Size of header in paragraphs
WORD e_minalloc; // Minimum extra paragraphs needed
WORD e_maxalloc; // Maximum extra paragraphs needed
WORD e_ss; // Initial (relative) SS value
WORD e_sp; // Initial SP value
WORD e_csum; // Checksum
WORD e_ip; // Initial IP value
WORD e_cs; // Initial (relative) CS value
WORD e_lfarlc; // File address of relocation table
WORD e_ovno; // Overlay number
WORD e_res[4]; // Reserved words
WORD e_oemid; // OEM identifier (for e_oeminfo)
WORD e_oeminfo; // OEM information; e_oemid specific
WORD e_res2[10]; // Reserved words
LONG e_lfanew; // File address of new exe header 指向PE头
} IMAGE_DOS_HEADER, *PIMAGE_DOS_HEADER;对于我们来说，有用的只有两个数据，一个是 e_magic 固定为 “MZ”，另外一个是最后的 e_lfanew ，指向pe头
看以下实例：