I need use a file DLL

[Thangnc]

I creat a file DLL by MFC use VisualBasic. But Input and Ouput don't compatible: // C++ extern "C" void PASCAL EXPORT CCreatFile(char lptFileName[20],char lptPath[200]) { FILE *ptrFile; char lptstr[250]; strcpy(lptstr,lptPath); strcat(lptstr,lptFileName); strcat(lptstr,".ads"); if(lptstr ==NULL) { MessageBox(NULL," File NULL!!!","Adsoft !",MB_ICONWARNING|MB_OK); return; } ptrFile=fopen(lptstr,"wb"); if(ptrFile ==NULL) { MessageBox(NULL,"Can't creat File !","Adsoft warning !",MB_ICONWARNING|MB_OK); return; } fclose(ptrFile); } // VB Private Declare Sub CCreatFile Lib "AdsoftDLL.dll" (TenB1 As String, Tenb2 As String) Private Sub Form_Load() Dim fileName As String Dim PathName As String fileName = "KimDo" PathName = "C:\\" Call CCreatFile(fileName, PathName) End Sub result erroneous

[Cedric Moonen]

If I remember correctly, the parameters of the VB function (so the prototype) must use strings by val: Private Declare Sub CCreatFile Lib "AdsoftDLL.dll" (ByVal TenB1 As String, ByVal Tenb2 As String) Also, I'm not sure if that will work: Thangnc wrote: extern "C" void PASCAL EXPORT CCreatFile(char lptFileName[20],char lptPath[200]) I think you will need to change it to that: extern "C" void PASCAL EXPORT CCreatFile(char* lptFileName,char* lptPath) But for that point, I'm not sure at all. Hope this helps. If not, try to give more details about the errors (crash, error messages, ...)