在内存中搜索字符串并修改该值

Question

我在另一个StackOverflow问题中找到了以下代码：

#include <iostream>
#include <vector>
#include <string>
#include <windows.h>
#include <algorithm>
#include <iterator>

template <class outIter>
void find_locs(HANDLE process, std::string const &pattern, outIter output) {

    unsigned char *p = NULL;
    MEMORY_BASIC_INFORMATION info;

    for ( p = NULL;
        VirtualQueryEx(process, p, &info, sizeof(info)) == sizeof(info);
        p += info.RegionSize ) 
    {
        std::vector<char> buffer;
        std::vector<char>::iterator pos;

        if (info.State == MEM_COMMIT && 
            (info.Type == MEM_MAPPED || info.Type == MEM_PRIVATE)) 
        {
            DWORD bytes_read;
            buffer.resize(info.RegionSize);
            ReadProcessMemory(process, p, &buffer[0], info.RegionSize, &bytes_read);
            buffer.resize(bytes_read);
            for ( pos = buffer.begin();
                buffer.end()!=(pos=std::search(pos, buffer.end(), pattern.begin(), pattern.end()));
                ++pos)
            {
                *output++ = p+(pos-buffer.begin());
            }
        }
    }
}

int main(int argc, char **argv) {
    if (argc != 3) {
        fprintf(stderr, "Usage: %s <process ID> <pattern>", argv[0]);
        return 1;
    }

    int pid;
    sscanf(argv[1], "%i", &pid);

    std::string pattern(argv[2]);

    HANDLE process = OpenProcess( 
        PROCESS_VM_READ | PROCESS_QUERY_INFORMATION, 
        false,
        pid);

    find_locs(process, pattern, 
        std::ostream_iterator<void *>(std::cout, "\n"));

    return 0;
}

但这是为了搜索字节。我想在内存中搜索一个特定的字符串，使用它我可以读取与之关联的值，然后在满足某个条件时修改它。比如，explorer.exe内存中的字符串MakeAllAppsDefault存储值0x00000000或0x00000001（取决于注册表中MakeAllAppsDefault的值），我想更改它。