Re: Japanese strings get mangled when sent from VB6 to VC++ dll

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deveasy wrote:
My VB6 program sends some strings to a VC++ dll. The program works fine for English, German et al. But it has problems with *some* Japanese characters. Please see two examples below:

Strings input from VB

ドラマに期待
を配布中

Strings obtained by C++ dll

ド䖁マに期䖁
䖁腍幅中

Here is the listing of the VB and C++ code. I'd appreciate any pointers to fix this problem.

Thanks,

V.


VB code:

Declare Function DoStuff Lib "Test.dll" (ByVal strName As String) As Double

Public Function SendToDll(strName As String) As Double
SendToDll = DoStuff(StrConv(strName, vbUnicode))
End Function


C++ code:

Declaration:

double __stdcall DoStuff(TCHAR* name);

Definition:

double __stdcall DoStuff(TCHAR* name)
{
AfxMessageBox(name);
return 1;
}

In the def file, the DoStuff function is exported

VB will convert any String parameter from Unicode to ANSI before passing it to an external function. When you call StrConv(...) you convert a Unicode String to a 'UniUniCode' String causing each character takes 4 bytes. No wonder then that the conversion fails.

To avoid VB converting strings to ANSI, you have to pass the StringPointer to the function: read ByVal StrPtr(strName).
Then your C++ function must accept a pointer to a BSTR. I can't give you code for this as I'm not an very experienced C++ programmer.

Tip: Google for 'pass string to DLL'

Sinna

.

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