How can I change text that is read via ReadFile function? I'm using detour to hook ReadFile functions calls. It works ok (I think so because of debug message boxes), but I can't change text that is read from the file.
static BOOL(WINAPI * true_read_file)(
HANDLE hFile
, LPVOID lpBuffer
, DWORD nNumberOfBytesToRead
, LPDWORD lpNumberOfBytesRead
, LPOVERLAPPED lpOverlapped) = ReadFile;
BOOL WINAPI my_read_file(
HANDLE hFile
, LPVOID lpBuffer
, DWORD nNumberOfBytesToRead
, LPDWORD lpNumberOfBytesRead
, LPOVERLAPPED lpOverlapped)
{
MessageBoxA(NULL, "my_read_file", "Some caption", MB_OK);
std::strcpy((char*)lpBuffer, "str"); // It doesn't work
return TRUE;
}
What am I doing wrong? How can I fix it?
Thanks in advance.
error 1: you should check nNumberOfBytesToRead, it's possible 1, so you code overrun the buffer.
error 2: you missed to fill lpNumberOfBytesRead.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.