Simple DLL injector

//  Written by mgostIH

//  You can change and distribute this program however you want, but please write the original author in a comment: mgostIH

#include <Windows.h>
#include <iostream>
#include <string>

HANDLE GetHandle(LPCSTR windowname)
{
    HWND hWnd = FindWindowA(0, windowname);
    std::cout << "Waiting for " << windowname << "..." << std::endl;
    while (!hWnd){
        hWnd = FindWindowA(0, windowname);
        Sleep(250);

    }
    system("CLS");
    DWORD pId;

    GetWindowThreadProcessId(hWnd, &pId);

    HANDLE hProc = OpenProcess(PROCESS_VM_READ | PROCESS_VM_WRITE | PROCESS_VM_OPERATION | PROCESS_QUERY_INFORMATION | PROCESS_CREATE_THREAD, FALSE, pId);
    int hprocerror = GetLastError();
    if (!hProc) {
        std::cerr << "Cannot open process. Error No. " << hprocerror << " happened.\n Try running this program in administrator mode." << std::endl;
        std::cin.get();
        return 0;
    }
    else{
        return hProc;
    }
}
DWORD AllocString(HANDLE hwnd, const char* ToAlloc, size_t strsize){
    PVOID addr = VirtualAllocEx(hwnd, NULL, strsize, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
    WriteProcessMemory(hwnd, addr, ToAlloc, strsize, NULL);
    return (DWORD)addr;

}

int main(int argc, char** argv){
    SetConsoleTitleA("Simple DLL Injector by mgostIH");
    DWORD LLa= (DWORD)LoadLibraryA;             //Get LoadLibraryA address
    std::string DllPath;

    if (argc > 1) DllPath = argv[1];            //Get the path if the dll is dragged onto the injector
    else {
            std::cout << "Write the entire DLL path:" << std::endl;
            std::getline(std::cin, DllPath);    //Otherwise, get the path from userinput
        }

    std::string option;
    std::cout << "Are you sure the correct path of the DLL to inject is: " << DllPath << " ? (Y/N)" << std::endl;
    std::getline(std::cin, option);

    if (tolower(option[0]) == 'n') {
        system("cls");
        main(1,argv);
    }

    std::string WindowName;
    std::cout << "Write window title of the process: ";
    std::getline(std::cin, WindowName);
    HANDLE hwnd = GetHandle(WindowName.c_str());

    char Payload[13] = { 0xB8, 0x00, 0x00, 0x00, 0x00, 0x68, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xD0, 0xC3 };

    /*
    MOV EAX,00000000    ; LoadLibraryA Address here later
    PUSH 00000000       ; Allocated DLL path Address here later
    CALL EAX            ;
    RET                 ;
    */

    *(DWORD*)(Payload + 1) = LLa;                                   //Modify the Payload by adding LoadLibraryA address
    *(DWORD*)(Payload + 6) = AllocString(hwnd,DllPath.c_str(),DllPath.size());  //Modify the Payload by adding the allocated string address

    DWORD PayloadAddr = AllocString(hwnd, Payload, sizeof(Payload));
    CreateRemoteThread(hwnd, 0, 0, (LPTHREAD_START_ROUTINE)PayloadAddr, 0, 0, 0);

    std::cout << "Dll Injected.\nYou can close this now." << std::endl;
    system("PAUSE>NUL");

}