shithook/main.cpp

#include <iostream>
#include "hook.hpp"
using namespace std;

BOOL HookWriteFile(
    HANDLE       hFile,
    LPCVOID      lpBuffer,
    DWORD        nNumberOfBytesToWrite,
    LPDWORD      lpNumberOfBytesWritten,
    LPOVERLAPPED lpOverlapped
)
{
    
    //this will change the output to "shithooked!\n"
    
    memset((void *)lpBuffer, NULL, nNumberOfBytesToWrite);
    memcpy((void*)lpBuffer, "shithooked!?\n", sizeof("shithooked!\n"));
    hook::disable(&WriteFile);
    BOOL result = WriteFile(hFile, lpBuffer, nNumberOfBytesToWrite, lpNumberOfBytesWritten, lpOverlapped);
    hook::enable(&WriteFile);
    return result;
}

int main()
{
    hook::install(
        &WriteFile,
        &HookWriteFile
    );

    OFSTRUCT ofstruct;
    OpenFile("output.txt", &ofstruct, OF_CREATE);
    HFILE result = OpenFile("output.txt", &ofstruct, OF_READWRITE);

    while (true)
    {
        Sleep(1000);
        char aString[] = "Hello world!\n";
        WriteFile((HANDLE)result, aString, sizeof(aString), NULL, NULL);
    }
}