如何创建随机文件 文件扩展名固定
用gettempfilename函数创建出来的文件 扩展名是.TMP 怎么能创建出指定扩展名 但是文件名随机的文件 例如建立xxx.dat xxx2.dat
[解决办法]
试试http://www.cplusplus.com/reference/cstdio/tmpnam/
[解决办法]
rand()函数 + 字符串连接即可.
char buf[0x20] = {0};
sprintf(buf,"%08x.TMP", (DWORD)rand());
如果不仅是想随机数字, 还想随机字母,汉字什么的, 只需有个表, rand()来作索引. 随机汉字只需按GB2312中规定的规则随机给出高低字节.
[解决办法]
CoCreateGuid
Creates a GUID, a unique 128-bit integer used for CLSIDs and interface identifiers.
HRESULT CoCreateGuid(
GUID *pguid //Pointer to the GUID on return
);
Parameter
pguid
[out] Pointer to the requested GUID on return.
Return Value
S_OK
The GUID was successfully created.
Win32 errors are returned byUuidCreate but wrapped as an HRESULT.
Remarks
The CoCreateGuid function calls the RPC function UuidCreate, which creates a GUID, a globally unique 128-bit integer. Use the CoCreateGuid function when you need an absolutely unique number that you will use as a persistent identifier in a distributed environment.To a very high degree of certainty, this function returns a unique value – no other invocation, on the same or any other system (networked or not), should return the same value.
QuickInfo
Windows NT: Use version 3.1 or later.
Windows: Use Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in objbase.h.
Import Library: Included as a resource in ole32.dll.
See Also
UuidCreate
