Michaelc
Cheater
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Joined: 15 May 2016
Posts: 47
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 Posted: Thu May 10, 2018 1:35 am Post subject: ReadProcessMemory always returns error |
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Hi all:
I am trying to create a memory scanner, but my readprocessmemory()
line always returns error!
The problem appears to originate from incorrect values/variables bed to the
function.
This is my code:
| Code: | #include <windows.h>
#include <stdio.h>
int main()
{
// I manually enter pid at this time for this experimental code.
int pid = 5428;
HANDLE process_handle = OpenProcess(
PROCESS_ALL_ACCESS,
FALSE,
pid);
// the values whose address are to be found by this code.
int Val = 12345;
char* p = NULL;
int* q;
int v;
DWORD dwStart = 0, i;
SIZE_T lpRead;
SYSTEM_INFO si;
MEMORY_BASIC_INFORMATION mbi;
DWORD MinAddr, MaxAddr;
DWORD lpBase;
DWORD Size = sizeof(int);
// Get Application Min And Max Value
GetSystemInfo(&si);
MinAddr = (DWORD)si.lpMinimumApplicationAddress;
MaxAddr = (DWORD)si.lpMaximumApplicationAddress;
// printf("MinAddr : %p\n", MinAddr);
// printf("MaxAddr : %p\n", MaxAddr);
dwStart = MinAddr;
puts("Begin");
while(1){
if (VirtualQueryEx( process_handle,(void *)dwStart,&mbi,sizeof(MEMORY_BASIC_INFORMATION) == 0))
{
printf("VirtualQueryEx failed.");
}
if(dwStart + mbi.RegionSize < dwStart)
{
//printf("Break. \n");
break;
}
//printf("This region has the size of: %p \n", (int)mbi.RegionSize);
if(mbi.State != MEM_COMMIT) {
dwStart+=mbi.RegionSize;
//printf("Continue. \n");
continue;
}
for(i=dwStart; i<dwStart+mbi.RegionSize; i+= Size) // i+= Size
{
//printf("It got to readprocess memory. \n");
if(ReadProcessMemory(process_handle, (LPVOID)i, &v, Size, NULL) != 0) // &lpRead
{
printf("Val = %d \n", Val);
if (v==Val)
{
//Address[AddCnt++] = i;
//printf("Found one: %p\n",i);
printf("Found one.");
}
}
else
{
printf("ReadProcessMemory has an error. \n");
}
}
dwStart+=mbi.RegionSize;
}
puts("End");
system("pause");
return 0;
}
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