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You can also use StrPtr with ANSI API calls to prevent VB from repeatedly applying the same string conversion to multiple calls For example, if you call a Declare function that takes the same ByVal ANSI String inside a loop, it is more efficient to convert the string manually using StrConv, declare the parameter ByVal As Long, and use StrPtr to make the call Dim strANSIName As String Dim pANSIName As Long strANSIName = StrConv(strName, vbFromUnicode) pANSIName = StrPtr(strANSIName) 'You can now pass pANSIName multiple times with a 'single conversion
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Like objects and arrays, strings are pointer types, so a String variable contains a pointer to a memory block that has the characteristics of a BSTR All BSTRs are allocated by OleAut32DII (via SysAllocString, SysAllocStringLen, or SysAllocStringByteLen) and freed using the SysFreeString API The VB runtime uses these API calls for string management when you assign and free strings, so you don't normally have to call them on your own However, if you are passed a pointer to a NULL-terminated string and need to read it in VB, you can use the API set yourself to allocate your own string All the OleAut32 string APIs are declared in the VBoostTypes typelib 'Create a VB-readable string from a UNICODE pointer Dim strReadable As String strReadable = SysAllocString(pUNICODEString) You have a little more work to do to get a readable string from an ANSI pointer, but it's still quite easy to do if you specify the byte length and let VB convert the string for you
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'Create a VB-readable string from an ANSI string pointer Dim strReadable As String strReadable = StrConv( _ SysAllocStringByteLen(pANSIString, _ lstrlen(pANSIString)), _ vbUnicode) STRINGS IN VB
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VB always lets you assume that the memory in a String variable is writable This can be both a good and a bad thing It's a good thing because the string can always be modified dynamically without using new memory (as described in the next section), but it also means that the VB compiler has no notion of a readonly string There are two immediate drawbacks to the lack of a read-only string type First, VB must make a copy of a constant string any time you pass it to a ByRef string parameter Second, VB automatically makes a copy of every string it receives via a ByVal String parameter to ensure that it can actually write to it The copy is made because the string pointer that comes in on the stack points to the location from which the string was passed, which shouldn't be changed in a ByVal pass Changing the data in the string causes a crash in a compiled EXE if a constant string is modified without first being copied To be on the safe side, VB simply copies the incoming string into a local variable that you can edit without modifying the passed string Using a ByRef String is the easiest way to avoid the string copy for functions in the same project However, if you are implementing an existing interface that takes potentially large strings as parameters, there is no way to avoid the string copy: You are forced to use a ByVal String To handle this situation, you can Implement a "VB-ized" copy of the interface that takes a ByVal Long instead of a ByVal String and simply borrow the string pointer This is easily done with a lightweight object that uses structure-termination code to change the string variable to a NULL value before VB gets a chance to call SysFreeString (see "Termination Code on Structures" in 8) The full code for the StringRef class is in StringRefBas Passing a string ByRef is fastest when the data is not being marshaled across a thread or process boundary However, ByRef As String translates to an [in,out] BSTR* and tells the marshaling engine to copy the string both into the destination thread and back to the calling thread after the call A ByVal pass is often recommended for marshaled strings to eliminate the overhead of copying the string back to the calling thread If you need to use public objects from both marshaled and same-thread clients, you can get the in-thread benefits of a ByRef string without the marshaling penalty by using the PowerVB Post-Build Type Library Modifier to change the marshaling signature on the ByRef string to [in] BSTR* (See 15 for more information)
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