实现在Windows下直接读写内存的方法

1、实现在Windows下直接读写内存的方法        1.利用Windows提供的各个段选择符标号,在C源程序中将选择符标号说明为外部变量。其对照表如下:表12.利用宏定义MAKELONG(段内偏移量,&段选择符标号)即可得到一个长指针。3.经上述方法得到的指针与C语言中定义的指针是一样的。4.如果使用的段是D000H或E000H或其它上位内存时,需改动Windows的系统配置文件SYSTEM.INI,利用字符编辑器,在386Enh小节中加入EmmExclude=xxxxyyyy一行,禁止Windows使

2、用这段存储空间。值xxxx和yyyy是16位内存范围。如开发的插件占用D000H段的64K,则应加入这样一行:EmmExclude=d000-dfff。利用这一方法,已使我们自己开发的电路板(占用D000H段),在Windows控制下成功地运行了。考虑到读者没有相应的硬件,这里以读取中断向量、计算机ROM的制造时间和对DOS用户通讯区的读写为例,详见以下程序。对于DOS用户通讯区的内容,读者可用DOS的DEBUG程序检查(D命令)和修改(E命令)。DOS的用户通讯区在004000F0H处开始,共计16个字节。在修改时请注意:从004000F0H开始存放可显示ASCII码字符串,并以0结尾。;M

3、EMORY.DEF模块定义文件NAMEMemoryDESCRIPTIONdemotrateanintergratedmenuEXETYPEWINDOWSSTUBWITUB.EXECODEPRELOADMOVEABLEDISCARDABLEDATAPRELOADMOVEABLEMULTIPLEHEAIZE1024STACKSIZE8192EXPORTSWndProc/*-MEMORY.RC直接读写内存的资源定义文件-*/#include"memory.h"MemoryMenuMENUBEGINPOPUP"取中断向量&I"BEGINMENUITEM&

4、quot;int0&3h",IDM-INT03HMENUITEM"int&10h",IDM-INT10HMENUITEM"int&21h",IDM-INT21HENDPOPUP"ROM区域&R"BEGINMENUITEM"制造时间&T",IDM-TIMEMENUITEM"取用户通讯区&U",IDM-READMENUITEM"存用户通讯区",IDM-WRITEENDMENUITEM"a退出&X"

5、;,IDM-EXITEND/*-MEMORY.H直接读写内存的头文件-*/#defineIDM-INT03H101#defineIDM-INT10H102#defineIDM-INT21H103#defineIDM-TIME201#defineIDM-READ202#defineIDM-WRITE203#defineIDM-EXIT300/*-MEMORY.C用户对固定内存直接读写的表演程序-*/#include#include"memory.h"#includeintPASCALWinMain(HANDLE,HANDLE,LTR,int);longFARPASCALWnd

6、Proc(HWND,UINT,UINT,LONG);/*-WinMain()-*/intPASCALWinMain(HANDLEhItance,HANDLEhPrevItance,LTRlzCmdLine,intnCmdShow)MSGmsg;HWNDhWnd;WNDCLAwndclaif(!hPrevItance)wndcla.style=CS-HREDRAW|CS-VREDRAW;wndcla.lpfnWndProc=WndProc;wndcla.cbClsExtra=0;wndcla.cbWndExtra=0;wndcla.hItance=hItance;wndcla.hIcon=Loa

7、dIcon(NULL,IDI-ALICATION);wndcla.hCursor=LoadCursor(NULL,IDC-ARROW);wndcla.hbrBackground=GetStockObject(WHITE-BRUSH);wndcla.lzMenuName="MemoryMenu"wndcla.lzClaame="直        接读写存储器"if(!RegisterCla(&wndcla)returnFALSE;hWnd=CreateWindow(&q

8、uot;直接读写存储器","直接读写存储器",WS-OVERLAEDWINDOW,CW-USEDEFAULT,CW-USEDEFAULT,CW-USEDEFAULT,CW-USEDEFAULT,NULL,NULL,hItance,NULL);if(!hWnd)returnFALSE;ShowWindow(hWnd,nCmdShow);UpdateWindow(hWnd);while(GetMeage(&msg,NULL,0,0)TralateMeage(&msg);DiatchMeage(&msg);returnmsg.wParam;/*-

9、WndProc()-*/longFARPASCALWndProc(HWNDhWnd,UINTmeage,UINTwParam,LONGlParam)HDChDC;HPENhOldPen,hNewPeRECTrect;TEXTMETRICtm;PAINTSTRUCTUINTi;charStrbuf50;WORDfar*InterruptVector;charfar*bioexternWORD-0000H;externWORD-0040H;externWORD-F000H;switch(meage)caseWM-COMMAND:switch(wParam)caseIDM-INT03H:Interr

10、uptVector=(WORDfar*)MAKELONG(0,&-0000H);wrintf(Strbuf,"向量地址:X:XHn",*(InterruptVector 0x06),*(InterruptVector 0x07);MeageBox(hWnd,Strbuf,"int03h",MB-OK|MB-ICOTOP);return0;caseIDM-INT10H:InterruptVector=(WORDfar*)MAKELONG(0,&-0000H);wrintf(Strbuf,"向量地址:X:XHn",*(In

11、terruptVector 0x20),*(InterruptVector 0x21);MeageBox(hWnd,Strbuf,"int10h",MBOK|MB-ICOTOP);return0;caseIDM-INT21H:InterruptVector=(WORDfar*)MAKELONG(0,&-0000H);wrintf(Strbuf,"向量地址:X:XHn",*(InterruptVector 0x42),*(InterruptVector 0x43);MeageBox(hWnd,Strbuf,"int21h",MB

12、-OK|MB-ICOTOP);return0;caseIDM-TIME:bios=(charfar*)MAKELONG(0xfff5,&-F000H);MeageBox(hWnd,bios,"ROM制造时间",MB-OK|MB-ICOTOP);return0;caseIDM-READ:bios=(charfar*)MAKELONG(0xF0,&-0040H);MeageBox(hWnd,bios,"取用户通讯区内容",MB-OK|MB-ICOTOP);return0;caseIDM-WRITE:bios=(charfar*)MAKELONG(0xF0,&-0040H);for(i=0;iMeageBox(hWnd,"WriteA-Jcharstring!","写用户通讯区内容",MB-OK|MB-ICO