wsprintf(szBuffer,_T("Insert Into Table_Test (Code,Name,) Values (%c,%f) "),vCode,vValue);错了.应该用:
wsprintf(szBuffer,_T("Insert Into Table_Test (Code,Name,) Values (%c,%f) "),(BYTE)vCode,(double)vValue);
原因就自己看看sprintf的源码吧.
wsprintf(szBuffer,_T("Insert Into Table_Test (Code,Name,) Values (%c,%f) "),(BYTE)vCode,(double)vValue);
原因就自己看看sprintf的源码吧.
在msdn中查一下VARIANT and VARIANTARG就可以知道了
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
C:\Test\Test.cpp(392) : error C2440: 'type cast' : cannot convert from 'struct tagVARIANT' to 'double'
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
Error executing cl.exe.