xp下用户程序空间分配（1）：大致框架

快乐虾

http://blog.youkuaiyun.com/lights_joy/

lights@hb165.com

本文适用于

Xp sp3

vs2008

欢迎转载，但请保留作者信息

《windows核心编程》告诉我们，对于每个应用程序的4G虚拟空间可以分为4个大块：

0x0000 0000 ~ 0x0000 ffff：空指针赋值分区

0x0001 0000 ~ 0x7ffe ffff：用户模式分区

0x7fff 0000 ~ 0x7fff ffff：64K禁入分区

0x8000 0000 ~ 0xffff ffff：内核模式分区

但是再要具体点就需要自己研究了。

咱就来看看一个应用程序是怎么使用这4G的空间的。先写段代码查询一下这4G空间中内存块的大致分类：

SYSTEM_INFO info;

MEMORY_BASIC_INFORMATION mi;

HANDLE hProcess;

DWORD dwAddr;

MEMORY_BASIC_INFORMATION miBlock[1000];

int nCount = 0;

hProcess = GetCurrentProcess();

GetSystemInfo(&info);

dwAddr = (DWORD)info.lpMinimumApplicationAddress;

do

{

VirtualQueryEx(hProcess, (LPCVOID)dwAddr, &mi, sizeof(mi));

memcpy(&miBlock[nCount++], &mi, sizeof(mi));

dwAddr += mi.RegionSize;

} while(dwAddr < (DWORD)info.lpMaximumApplicationAddress);

print_block_table(miBlock, nCount);

。。。。。。。。。。。。。

在这种方式下，将可以得到249个内存块，如下表所示（所有值均为十六进制）：

基址	分配基址	分配保护	大小	状态	保护	类型
00010000	00010000	00000004 PAGE_READWRITE	00002000	00001000 MEM_COMMIT	00000004 PAGE_READWRITE	00020000 MEM_PRIVATE
00012000	00000000	00000000	0000e000	00010000 MEM_FREE	00000001 PAGE_NOACCESS	00000000
00020000	00020000	00000004 PAGE_READWRITE	00001000	00001000 MEM_COMMIT	00000004 PAGE_READWRITE	00020000 MEM_PRIVATE
00021000	00000000	00000000	0000f000	00010000 MEM_FREE	00000001 PAGE_NOACCESS	00000000
00030000	00030000	00000004 PAGE_READWRITE	000ed000	00002000 MEM_RESERVE	00000000	00020000 MEM_PRIVATE
0011d000	00030000	00000004 PAGE_READWRITE	00001000	00001000 MEM_COMMIT	00000104 PAGE_READWRITE PAGE_GUARD	00020000 MEM_PRIVATE
0011e000	00030000	00000004 PAGE_READWRITE	00012000	00001000 MEM_COMMIT	00000004 PAGE_READWRITE	00020000 MEM_PRIVATE
00130000	00130000	00000002 PAGE_READONLY	00003000	00001000 MEM_COMMIT	00000002 PAGE_READONLY	00040000 MEM_MAPPED
00133000	00000000	00000000	0000d000	00010000 MEM_FREE	00000001 PAGE_NOACCESS	00000000
00140000	00140000	00000002 PAGE_READONLY	00001000	00001000 MEM_COMMIT	00000002 PAGE_READONLY	00040000 MEM_MAPPED
00141000	00000000	00000000	0000f000	00010000 MEM_FREE	00000001 PAGE_NOACCESS	00000000
00150000	00150000	00000004 PAGE_READWRITE	00012000	00001000 MEM_COMMIT	00000004 PAGE_READWRITE	00020000 MEM_PRIVATE
00162000	00150000	00000004 PAGE_READWRITE	000ee000	00002000 MEM_RESERVE	00000000	00020000 MEM_PRIVATE
00250000	00250000	00000004 PAGE_READWRITE	00006000	00001000 MEM_COMMIT	00000004 PAGE_READWRITE	00020000 MEM_PRIVATE
00256000	00250000	00000004 PAGE_READWRITE	0000a000	00002000 MEM_RESERVE	00000000	00020000 MEM_PRIVATE
00260000	00260000	00000004 PAGE_READWRITE	00003000	00001000 MEM_COMMIT	00000004 PAGE_READWRITE	00040000 MEM_MAPPED
00263000	00260000	00000004 PAGE_READWRITE	0000d000	00002000 MEM_RESERVE	00000000	00040000 MEM_MAPPED
00270000	00270000	00000002 PAGE_READONLY	00016000	00001000 MEM_COMMIT	00000002 PAGE_READONLY	00040000 MEM_MAPPED
00286000	00000000	00000000	0000a000	00010000 MEM_FREE	00000001 PAGE_NOACCESS	00000000
00290000	00290000	00000002 PAGE_READONLY	00041000	00001000 MEM_COMMIT	00000002 PAGE_READONLY	00040000 MEM_MAPPED
002d1000	00000000	00000000	0000f000	00010000 MEM_FREE	00000001 PAGE_NOACCESS	00000000
002e0000	002e0000	00000002 PAGE_READONLY	00041000	00001000 MEM_COMMIT	00000002 PAGE_READONLY	00040000 MEM_MAPPED
00321000	00000000	00000000	0000f000	00010000 MEM_FREE	00000001 PAGE_NOACCESS	00000000
00330000	00330000	00000002 PAGE_READONLY	00006000	00001000 MEM_COMMIT	00000002 PAGE_READONLY	00040000 MEM_MAPPED
00336000	00000000	00000000	0000a000	00010000 MEM_FREE	00000001 PAGE_NOACCESS	00000000
00340000	00340000	00000002 PAGE_READONLY	00041000	00001000 MEM_COMMIT	00000002 PAGE_READONLY	00040000 MEM_MAPPED
00381000	00000000	00000000	0000f000	00010000 MEM_FREE	00000001 PAGE_NOACCESS	00000000
00390000	00390000	00000004 PAGE_READWRITE	0003c000	00002000 MEM_RESERVE	00000000	00020000 MEM_PRIVATE
003cc000	00390000	00000004 PAGE_READWRITE	00001000	00001000 MEM_COMMIT	00000104 PAGE_READWRITE PAGE_GUARD	00020000 MEM_PRIVATE
003cd000	00390000	00000004 PAGE_READWRITE	00003000	00001000 MEM_COMMIT	00000004 PAGE_READWRITE	00020000 MEM_PRIVATE
003d0000	003d0000	00000002 PAGE_READONLY	00001000	00001000 MEM_COMMIT	00000002 PAGE_READONLY	00040000 MEM_MAPPED
003d1000	00000000	00000000	0000f000	00010000 MEM_FREE	00000001 PAGE_NOACCESS	00000000
003e0000	003e0000	00000004 PAGE_READWRITE	00005000	00001000 MEM_COMMIT	00000004 PAGE_READWRITE	00020000 MEM_PRIVATE
003e5000	003e0000	00000004 PAGE_READWRITE	0000b000	00002000 MEM_RESERVE	00000000	00020000 MEM_PRIVATE
003f0000	003f0000	00000002 PAGE_READONLY	00003000	00001000 MEM_COMMIT	00000002 PAGE_READONLY	00040000 MEM_MAPPED
003f3000	00000000	00000000	0000d000	00010000 MEM_FREE	00000001 PAGE_NOACCESS	00000000
00400000