first experience

// C_hack.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <windows.h>
#include <iostream>
#include <string>
#include <tlhelp32.h>
#include <cstdlib>
#include <inttypes.h>
#include <list>

using namespace std;
int64_t S64(const char* s) {
    int64_t i;
    char c;
    int scanned = sscanf_s(s, "%" SCNd64 "%c", &i, &c);
    if (scanned == 1) return i;
    if (scanned > 1) {
        // TBD about extra data found
        return i;
    }
    // TBD failed to scan;
    return 0;
}



DWORD FindProcessId(const std::wstring& processName)
{
    PROCESSENTRY32 processInfo;
    processInfo.dwSize = sizeof(processInfo);

    HANDLE processesSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, NULL);
    if (processesSnapshot == INVALID_HANDLE_VALUE)
        return 0;

    Process32First(processesSnapshot, &processInfo);
    if (!processName.compare(processInfo.szExeFile))
    {
        CloseHandle(processesSnapshot);
        return processInfo.th32ProcessID;
    }

    while (Process32Next(processesSnapshot, &processInfo))
    {
        if (!processName.compare(processInfo.szExeFile))
        {
            CloseHandle(processesSnapshot);
            return processInfo.th32ProcessID;
        }
    }

    CloseHandle(processesSnapshot);
    return 0;
}

HANDLE pHandle;
SYSTEM_INFO si;
MEMORY_BASIC_INFORMATION mbi;
LPVOID lpMem;
DWORD ret, totalRead;

string readText(DWORD pid, uint64_t loc) {

    lpMem = (void*)loc;


    string raw;
    list<char> text;
    uint64_t offset = loc;
    bool flag = true;
    while (flag) {
        lpMem = (void*)offset;
        char buf;
        ReadProcessMemory(pHandle, lpMem, (LPVOID)(&buf), 1, &totalRead);
        if (buf != '\0' && buf != '\r' && buf != '\n') {
            raw.push_back(buf);

        }
        else {
            flag = false;
        }
        offset++;
    }
    return raw;
}

int main()
{
    std::cout << "Hello World!" <<endl;
    printf("Test\n");
    std::cout << "Please, enter process name to try and inject: ";
    wstring pname;
    std::getline(wcin, pname);
    std::cout << "Please, enter offset in integer to read some text from: ";
    string offset;
    std::getline(cin, offset);


    DWORD processID = FindProcessId(pname);

    pHandle = OpenProcess(PROCESS_ALL_ACCESS, 0, processID);
    if (pHandle == NULL) {
        exit(5);
    }



    std::cout << readText(processID, S64(offset.c_str()));
    std::getline(cin, offset);
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started:
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file