![]() # Else // debug and release with a value greater than 512 If (nlen = 64) // call the manager separately based on the memory size # Ifndef _ debug is in the release version and cannot exceed 512 bytes } Void fastcall cstring: freedata (cstringdata * pdata) // release the memory ![]() In release mode, memory pool management is used for Memory Allocation Operations of no more than 512 bytes.Īnd subdivided into four memory pools for management: nalloclength = 64 Vc6 uses new and delete to operate cstring in memory greater than 512 bytes and debug mode. Too many heap fragments directly affect program efficiency. Frequent small memory allocation and release on the stackĪ large number of fragments must be produced on the stack. New and delete are allocated in the process heap in implementation. The result is that every time the memory size is changed, additional resources are required. There is no function corresponding to realloc. The evolution of cstring memory management is as follows:īecause string operations require frequent memory size adjustment, the C ++ operator new and delete are used. Label that is just below and to the right of this text.The cstring class is a frequently used class, so it is necessary to analyze its memory management mode. If you liked this article and want to see more from Sprintf, _sprintf_l, swprintf, _swprintf_l, _swprintf_l However, there is an excellent chance that at least one of the variations will work for you in your development system, whatever it is. Some Microsoft-specific functionality is implied (refer to the references, below, if you worry about these things). The examples above compile and work under Microsoft VS2008. std::string sNumber= "1234567890" int nResult nResult= atoi( sNumber.c_str() ) Select all Open in new window STL std::string to int CString sNumber= "1234567890" int nResult nResult= atoi( sNumber ) // automatically does LPCSTR(sNumber) Select all Open in new window ATL/MFC CString to int char szNumber= "1234567890" int nResult nResult= atoi( szNumber ) ![]() ![]() int n std::string sResult std::ostringstream ostr ostr. Select all Open in new window int to STL std::string int n CString sResult sResult.Format( "%d", n ) // use "%u" for unsigned int Select all Open in new window int to ATL/MFC CString _itoa( n, szResult, 10 ) _itoa_s( n, szResult, sizeof(szResult), 10) // "safe" version sprintf( szResult, "%d", n ) // use "%u" for unsigned int sprintf_s( szResult, sizeof(szResult), "%d", n ) // "safe" version //- alternative: itoa #include. This EE article provides examples of conversion techniques for various types of string variables: classic C-style strings, MFC/ATL CStrings, and STL's std::string data type.Ĭonvert Integer to String int to C-style (NULL-terminated char) string ![]()
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