常用数据类型转换使用详解.docVIP

VC3￡ó?êy?YààDíê1ó?×a???ê?a CString ,BSTR ,LPCTSTR????1??μoí??±e CStringê?ò????ˉì?TCHARêy×é￡?BSTRê?ò???רóD??ê?μ?×?·?′?￡¨Dèòaó??μí3ìá1?μ?oˉêyà′2ù×Y￡?LPCTSTR??ê?ò???3￡á?μ?TCHAR?????￡ CString ê?ò???íêè??àá￠μ?àà￡??ˉì?μ?TCHARêy×é￡?·a×°á? + μè2ù×÷·?oí×?·?′?2ù×÷·?·¨?￡ typedef OLECHAR FAR* BSTR; typedef const char * LPCTSTR; vc++?D?÷??×?·?′?μ?±íê?·¨ ê×?èchar* ê????òANSI×?·?êy×éμ?????￡????D????×?·????Y8??￡¨óDD§êy?Yê?3yμ?×?????μ?????7??￡?￡??aà?±￡3?á?ó?′?í3μ?C,C++μ???èY?￡ LPμ?o?ò?ê?3¤????(long pointer)?￡LPSTRê?ò??????òò???/0?ˉ?á?2μ?ANSI×?·?êy×éμ?????￡?ó?char*?éò??￥??ê1ó?￡??úwin32?D???àμ?ê1ó?LPSTR?￡ ??LPCSTR?D???óμ???C?ˉμ?o?ò?ê??°CONSTANT?±￡¨3￡á?￡?￡?±í?÷?a??êy?YààDíμ?êμày2??ü±?ê1ó??üμ?APIoˉêy??±?￡?3y′???ía￡??üó?LPSTRê?μèí?μ??￡ LP±íê?3¤????,?úwin16??óD3¤????(LP)oí?ì????(P)μ???±e,???úwin32??ê???óD??±eμ?,??ê?32??.?ùò??aà?μ?LPoíPê?μè??μ?. C±íê?const Tê?ê2?′???÷??,?ò???aμàTCHAR?ú2éó?Unicode·?ê?±àò?ê±ê?wchar_t,?ú??í¨ê±±àò?3échar. ?aá??ú×?3ìDò′ú??1ú?ê?ˉμ?Dèòa￡?òμ??í?3?á?Unicode±ê×?￡??üìá1?á?ò????òμ￥oíò???μ?±í′?×?·?′?μ?·?·¨￡??ùóD×?·??Dμ?×??ú??ê?16??μ??μ￡???êyá?ò2?éò??ú×?2?2??àêà??é??ùóDêé??ó???×?·?μ?±à??Dè?ó￡??a·￠3ìDòê±ê1ó?Unicode￡¨ààDí?awchar_t)ê?ò???±?1?à?μ?×?·¨?￡ LPWSTRó?LPCWSTRóé′?2úéú￡??ü??μ?o?ò?àà??óúLPSTRó?LPCSTR￡???ê?×?·?êy?Yê?16??μ?wchar_t??2?ê?char?￡ è?oó?aá?êμ??á???±à??μ?í¨ó?￡?ìá3?á?TCHARμ??¨ò?￡o è?1??¨ò?_UNICODE￡?éù?÷è???￡o typedef wchar_t TCHAR; è?1???óD?¨ò?_UNICODE￡??òéù?÷è???￡o typedef char TCHAR; LPTSTRoíLPCTSTR?Dμ?o?ò??íê?????×?·?ê??a?ùμ?TCHAR?￡ CStringàà?Dμ?×?·??íê?±?éù?÷?aTCHARààDíμ?￡??üìá1?á?ò???·a×°o?μ?àà1?ó??§·?±?μ?ê1ó??￡ LPCTSTR: #ifdef _UNICODE typedef const wchar_t * LPCTSTR; #else typedef const char * LPCTSTR; #endif VC3￡ó?êy?YààDíê1ó?×a???ê?a ?è?¨ò?ò?D?3￡??ààDí±?á??èò??μ?÷ int i = 100; long l = 2001; float f=300.2; double d=12345.119; char username[]=???à3ì???y; char temp[200]; char *buf; CString str; _variant_t v1; _bstr_t v2; ò??￠???üêy?YààDí×a???a×?·?′? ?ì??Dí(int) itoa(i,temp,10); //??i×a???a×?·?′?·?è?temp?D,×?oóò???êy×