请帮我读内存映射文件。我用下面的代码打开文件。然后我想读取8到16字节。我该怎么做?内存映射文件C++
// 0. Handle or create and handle file
m_hFile = CreateFile(file_path.c_str(), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (m_hFile == INVALID_HANDLE_VALUE)
{
if (GetLastError() == ERROR_FILE_NOT_FOUND)
{
m_hFile = createNewFile(file_path.c_str());
}
else throw GetLastError();
}
// 1. Create a file mapping object for the file
m_hMapFile = CreateFileMapping(m_hFile, NULL, PAGE_READWRITE, 0, 0, NULL);
if (m_hMapFile == NULL) throw GetLastError();
// 2. Map the view.
m_lpMapAddress = MapViewOfFile(m_hMapFile, FILE_MAP_ALL_ACCESS, 0, 0, 0);
// to map
if (m_lpMapAddress == NULL) throw GetLastError();
从这一个dublicate:[链接](http://stackoverflow.com/questions/9889557/mapping-large-files-using-mapviewoffile )。你有指针m_lpMapAddress,希望它是一个字节指针。将8个字节添加到指针并读取内存。这就是全部 – mrAtari
@mrAtari如何添加8个字节? – ExiD
m_lpMapAddress + = 8 – mrAtari