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Subtraction of two pointers (addresses) in "C language"

Subtract two pointers, which is the number of two pointer types that are spaced between two pointers.such as: int *p,*q;P-q= (p address-Q address)/sizeof (int)#include intMain () {inta[9]={1,2,3,4,5,6,7,8,9}; Char*p,*Q; int*p2,*Q2; P=(Char*) A; Q=(Char*) a[2]; printf ("p=%08x q=%08x a[%d]=%d\n", p,q,q-p,a[q-p]); //The result is: x,x+8,8/sizeof (char), a[8]=9P2=A; Q2=a[2]; printf ("p2=%

printf, sprintf, output data type

number of digits to output (if the number of digits being output is less than the specified precision, add 0 to the front of the output value).printf ("%.4d/n", 873)printf ("%.9d/n", 873)The output result is:0873000000873 sprintf (S, "%08x", 4567); and sprintf (S, "%.8x", 4567); The two ways of writing are the same.printf ("%.8x", 4567); and printf ("%08x", 4567); The two ways of writing are the same. %

Wrtnode (MT7620) boot OpenWrt process record (medium) via USB

Looks like kernel ignored Bootargs. The code is located in the Build_dir...arch/mips/ralink PROM.C static __init void Prom_init_cmdline (int argc, char **argv) { int i; Manfeel, mod to pr_info from Pr_debug Pr_info ("prom:fw_arg0=%08x fw_arg1=%08x fw_arg2=%08x fw_arg3=%08x\n", (unsigned int)

Notes on counterfeit return address bypassing CallStack detection and counterfeit return address detection

return address exists. Void_ StdcallCheck_callstack (void){Int saved_ebp;Int retaddr; Printf ("Check Call Stack Methord 1 :");_ Asm{Mov eax, dword ptr [ebp + 4]Mov retaddr, eaxMov eax, dword ptr [ebp]Mov saved_ebp, eax}Printf ("retaddr = 0x % 08X", retaddr ); While (saved_ebp {If (saved_ebp! = 0){Retaddr = * (int *) (saved_ebp + 4 );Printf ("retaddr = 0x % 08X", retaddr );Saved_ebp = * (int *) saved_ebp;}}

See Windows Process

process in turnDo{Printf ("/n ==================================== ============================ ");Printf ("/nprocess name: % s", pe32.szexefile );Printf ("/n -----------------------------------------------------"); // Retrieve the priority class.Dwpriorityclass = 0;Hprocess = OpenProcess (process_all_access, false, pe32.th32processid );If (hprocess = NULL)Printerror ("OpenProcess ");Else{Dwpriorityclass = getpriorityclass (hprocess );If (! Dwpriorityclass)Printerror ("getpriorityclass ");Close

A Preliminary Study on Windows ce api Mechanism

: processaddressPurpose:Returns an address of memory slot for the given process index.Parameters:Byte p_byprocnum-process number (slot index) between 0 and 31Returns:Address of the memory slot.-------------------------------------------------------------------*/Inline DWORD processaddress (byte p_byprocnum){Return 0x02000000 * (p_byprocnum + 1 );} Int winapi winmain (hinstance,Hinstance hprevinstance,Lptstr lpcmdline,Int ncmdshow){File * FP;DWORD l_dwoldpermissions = 0; If (FP = fopen ("// apis.

On the size of virtual inheritance classes, VC + + and g++ results are different

------------------\ n", size); for (int i = 0;i { p = (DWORD) base+i* 4; pnext = * (DWORD *) (p); printf (" |--0x%08x: 0x%08x", P,pnext); //What's in the print class? if (pnext>0x400000) //Print the contents of a contiguous three address under this address { printf (": 0x%08x 0x%08x 0x%

How to get module information based on thread number

;} thread_basic_information, *pthread_basic_information;extern "C" LONG (__stdcall *zwqueryinformationthread) (In HANDLE Threadhandle,In Threadinfoclass Threadinformationclass,Out PVOID Threadinformation,In ULONG Threadinformationlength,Out Pulong returnlength OPTIONAL) = NULL;The preparation to be done in the main function:SetLocale (Lc_all, ". ACP ");HInstance Hntdll =:: GetModuleHandle (TEXT ("Ntdll"));(farproc) Zwqueryinformationthread =:: GetProcAddress (Hntdll, "Zwqueryinformationthread");

The backlog in Linux is detailed

state of the socket, while we typically use Netstat to see the state of these socketsCase Tcp_syn_recv:if (acceptable) {tp->copied_seq = TP->RCV_NXT;SMP_MB (); Tcp_set_state (SK, TCP_ESTABLISHED);We see that the status from SYN_RECV is set directly to established, that is, when the server receives the ACK from the client, the status is TCP_SYN_RECV and immediately enters the Tcp_rcv_state_ The process function is set to state established, there is basically no tcp_syn_recv state period, but we

PE related code

!= pntheader->signature){printf ("/n/t----------Lawless PE file! ----------/n ");Goto EXIT;} DWORD Dwrelocoffset = Rva2offset (Pntheader, Pntheader->optionalheader.datadirectory[image_directory_entry_ Basereloc]. virtualaddress);Pimage_base_relocation Preloc = (pimage_base_relocation) ((DWORD) Pbfile + dwrelocoffset); if (0 = preloc->virtualaddress){printf ("/n/t----------No Relocation table! ----------/n ");Goto EXIT;} while (preloc->virtualaddress){printf ("[0x%

Null Pointer Vulnerability Protection Technology-Preliminary

0x00000000 c. after applying for a new memory, the pointer variable value is 0x6e7a78 d. after the memory is released, P becomes a wild pointer, but the value of P is still the requested memory address 0x6e7a78, but the P pointer cannot be used at this time. E. If P = NULL, p points to the address 0x00000000 again. It can be seen that after we release the pointer variable, the pointer variable will become a wild pointer. If we reference this pointer at this time, illegal access will occur. Ther

VC knowledge point record

streambytestransferred, // total number of bytes transferred for this streamDWORD dwstreamnumber, // The current streamDWORD dwcallbackreason, // reason for callbackHandle hsourcefile, // handle to the source fileHandle hdestinationfile, // handle to the destination fileLpvoid lpdata // passed by copyfileex){Static int nrecord = 0;Nrecord ++;Printf ("Callback times: % d transmitted: % 08x: % 08x file size:

Profiling Windows NT/2000 Kernel Object Organization (http://webcrazy.yeah.net)

kernel object// Only test on Windows 2000 Server Chinese edition// Build 2195 (free )! Programmed by webcrazy// (Tsu00@263.net) on!// Welcome to http://webcrazy.yeah.net!////----------------------------------------------- Ulong obprootdirectoryobject = 0x8148e210; // fetch from symbol File Void dumpdirectoryobject (pvoid directoryobject){Ulong hashbucket;Ulong * hash; For (hashbucket = 0; hashbucket {Hash = (ulong *) (ulong) directoryobject + hashbucket * 4 );If (* hash = 0) continue; Dbuplint

About displaying the filter graph of an application in graphedit

that this can only be used in 2000 and XP. The following code adds the filter graph in the application to the rot, Hresult augraph: addtorot (iunknown * punkgraph, DWORD * pdwregister){Hresult hR = noerror;Imoniker * pmoniker = NULL;Irunningobjecttable * prot = NULL;If (failed (getrunningobjecttable (0, prot ))){Return e_fail;} Wchar wsz [256];: Memset (wsz, 0,256 );// WsprintfW (wsz, l "PID: % 08x igraphfilter = %

You can also switch to Skype-get started with shell program development based on Skype API

(fglobal_dumpwindowsmessages){Printf ("windowproc: hwindow = 0x % 08x, mainwindow = 0x % 08x, message = % 5u, wparam = 0x % 08x, lparam = 0x % 08x; return = % LD % s/n ",Hwindow, hinit_main1_whandle, uimessage, uiparam, ulparam, lreturncode, fissuedefproc? "(Default )":"");}Return (lreturncode );} Bool initialize_crea

) Structured exception handling in Windows program design

("frame: % 08x handler: % 08x PREV: % 08x scopetable: % 08x \ n ", \ PVC excrec, PVC excrec-> handler, PVC excrec-> Prev, PVC excrec-> scopetable); pscopetable pscopetableentry = PVC excrec-> scopetable; For (INT I = 0; I Nested exception structure Example 1:Output result:Nested exception structure Example 2:Output re

(GPS) GPS Message Queue parsing

= (msg_q*) msg_q_data;//Lock P_msg_q Mutex,pthread_mutex_lock and PTHREAD_COND_XXX series functions are generally paired, preventing the competition between multi-threaded PTHREAD_COND_XXX series functionsPthread_mutex_lock (p_msg_q->list_mutex); LOC_LOGD ("%s:sending message with handle = 0x%08x\n", __function__, msg_obj);if(p_msg_q->unblocked) {//If it is not locked, the MSG is not availableLoc_loge ("%s:message queue has been unblocked.\n", __func

[Go] parsing winndows 2000/xp physical memory management

=* ((unsignedint*) (pfndatabase+0x4)); AboutFlag = * (Char*)((Char*) pfndatabase+0xd); theFlag =0x07; the the if(ppte>=0xe1000000ppte0xf0000000){ +subsection=Migetsubsectionandprotofrompte (restorepte); -Dbgprint ("pfn:%04x,ppte:%08x,restorepte:%08x,subsection:%08x,ca:%08x, theflag:%10s\n", Pfn,ppte,restor

Arm:jlink Debug and direct burn-write operation different [MDK s3c2440]

1, the initialization of global variables.2. Cases not found yet./*************************************************/First on connection file SCTLr_rom1 0x30000000 0x00010000 { ; Load Region size_region Er_rom1 0x30000000 0x00010000 { ; Load address = execution Address *.o (RESET, +first) * (inroot$ $Sections) . Any (+ro) } rw_ram1 0x30010000 0x02000000 { ; RW Data . Any (+RW +zi) } rw_iram1 0x40000000 0x00001000 { . Any (+RW +zi) }}1, the initialization of global varia

Full version of Java read apk, IPA package name, version name, version number and other information

", versionname); }Else if("Package". Equals (Parser.getattributename (i)) {String PackageName = Getattributevalue (parse R, I);if(NULL= = PackageName) {PackageName =""; } map.put ("Package", PackageName); }Else if("Versioncode". Equals (Parser.getattributename (i))) {String Versioncode = getattributevalue (parser , i);if(NULL= = Versioncode) {Versioncode =""; } map.put ("Versioncode", Versioncode); } } Break; }}}}} zipfile.close (); }Catch(Exception e) {Map.

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