PFrom ， MSDN 的说明:
Address of a buffer to specify one or more source file names. These names must be fully qualified paths. Standard Microsoft® MS-DOS® wildcards, such as "*", are permitted in the file name position. Although this member is declared as a null-terminated string, it is used as a buffer to hold multiple file names. Each file name must be terminated by a single NULL character. An additional NULL character must be appended to the end of the final name to indicate the end of pFrom.
可是 LPCWSTR和CSTRING 遇到\0就认为结束了.