VB COM, Pls help: Calling C++ DLL using MFC from VB

Pls help: Calling C++ DLL using MFC from VB

Author	Message
Ger #1 / 4	Pls help: Calling C++ DLL using MFC from VB I need to call a DLL from my VB program that was written in C++. I tried to register the dll with regsvr32 but I get the error: "No DLL Register Server entry point was found". When I attempt to call the DLL from VB6 I get a similar error: "Can't find DLL entry point OpenNosGeo in c:\sailbase-development\softchart-sdk\NosGeo" Here is the simple VB test code I used to test the function "OpenNosGeo" in the CNosDoc class: Private Declare Function OpenNosGeo Lib "c:\sailbase-development\softchart-sdk\NosGeo" (FileName As String, bFastOpen As Boolean) As Boolean Private Sub Command1_Click() 'run this code when button is clicked Dim result As Boolean result = OpenNosGeo("C:\SoftCht\13225", False) 'call the function in the DLL End Sub The author of the DLL says in his documentation: "The NosGeo.dll is a DLL that uses dynamic linking to the MFC classes. If the MFC classes are not already loaded then they will be required before running with NosGeo.dll". But how can I load these classes from VB? I know that MFC means Microsoft Foundation Classes, but where can I find these? I have the C++ source code of the DLL, but I am not a C++ programmer, but I could modify the code if necessary with some help. -- Rgds, /Ger Rietman www.sailsoft.nl
Mon, 28 Mar 2005 15:32:14 GMT

CJM #2 / 4	Pls help: Calling C++ DLL using MFC from VB I'm not an expert on these things, but unless the DLL is create as a COM DLL in C++, I dont think it can be used in VB6... CJM Quote: > I need to call a DLL from my VB program that was written in C++. > I tried to register the dll with regsvr32 but I get the error: "No DLL > Register Server entry point was found". > When I attempt to call the DLL from VB6 I get a similar error: > "Can't find DLL entry point OpenNosGeo in > c:\sailbase-development\softchart-sdk\NosGeo" > Here is the simple VB test code I used to test the function "OpenNosGeo" in > the CNosDoc class: > Private Declare Function OpenNosGeo Lib > "c:\sailbase-development\softchart-sdk\NosGeo" (FileName As String, > bFastOpen As Boolean) As Boolean > Private Sub Command1_Click() 'run this code when button is clicked > Dim result As Boolean > result = OpenNosGeo("C:\SoftCht\13225", False) 'call the function in the DLL > End Sub > The author of the DLL says in his documentation: "The NosGeo.dll is a DLL > that uses dynamic linking to the MFC classes. If the MFC classes are not > already loaded then they will be required before running with NosGeo.dll". > But how can I load these classes from VB? I know that MFC means Microsoft > Foundation Classes, but where can I find these? > I have the C++ source code of the DLL, but I am not a C++ programmer, but I > could modify the code if necessary with some help. > -- > Rgds, > /Ger Rietman > www.sailsoft.nl
Mon, 28 Mar 2005 18:45:23 GMT

Ger #3 / 4	Pls help: Calling C++ DLL using MFC from VB You may be right, but I am not sure either. Maybe an expert in this matter shows up in this group? Thanks for the response anyway. -- Rgds, /Ger Rietman www.sailsoft.nl Quote: > I'm not an expert on these things, but unless the DLL is create as a COM DLL > in C++, I dont think it can be used in VB6... > CJM > > I need to call a DLL from my VB program that was written in C++. > > I tried to register the dll with regsvr32 but I get the error: "No DLL > > Register Server entry point was found". > > When I attempt to call the DLL from VB6 I get a similar error: > > "Can't find DLL entry point OpenNosGeo in > > c:\sailbase-development\softchart-sdk\NosGeo" > > Here is the simple VB test code I used to test the function "OpenNosGeo" > in > > the CNosDoc class: > > Private Declare Function OpenNosGeo Lib > > "c:\sailbase-development\softchart-sdk\NosGeo" (FileName As String, > > bFastOpen As Boolean) As Boolean > > Private Sub Command1_Click() 'run this code when button is clicked > > Dim result As Boolean > > result = OpenNosGeo("C:\SoftCht\13225", False) 'call the function in the > DLL > > End Sub > > The author of the DLL says in his documentation: "The NosGeo.dll is a DLL > > that uses dynamic linking to the MFC classes. If the MFC classes are not > > already loaded then they will be required before running with NosGeo.dll". > > But how can I load these classes from VB? I know that MFC means Microsoft > > Foundation Classes, but where can I find these? > > I have the C++ source code of the DLL, but I am not a C++ programmer, but > I > > could modify the code if necessary with some help. > > -- > > Rgds, > > /Ger Rietman > > www.sailsoft.nl
Mon, 28 Mar 2005 19:50:18 GMT

Klaus H. Probs #4 / 4	Pls help: Calling C++ DLL using MFC from VB Quote: > I need to call a DLL from my VB program that was written in C++. > I tried to register the dll with regsvr32 but I get the error: "No DLL > Register Server entry point was found". It's not a COM server DLL. Quote: > When I attempt to call the DLL from VB6 I get a similar error: > "Can't find DLL entry point OpenNosGeo in > c:\sailbase-development\softchart-sdk\NosGeo" The function is probably not exported correctly. VB cannot use __cdecl exports and it can't call "mangled" exports. The person who wrote the DLL should know what that means. Perhaps he/she can fix it for you. . . . . . . . . . . . . . . . . . . . . . . Klaus H. Probst, MVP http://www.vbbox.com/ Please post/reply to the newsgroup(s)
Tue, 29 Mar 2005 11:21:49 GMT

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