Retrieve the calling thread's last-error code value.

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Retrieves the calling thread's last-error code value.

    CkString str;

    // Cause in intentional error.
    HANDLE fHandle = INVALID_HANDLE_VALUE;
    DWORD fileSize = GetFileSize(fHandle,0);

    str.appendLastWindowsError();

    // Prints: The handle is invalid.
    printf("%s\n",str.getString());