C++ Dll????

[Blixten69]

Didnt know if i should have put it under C++ Or VB

Well i found a c++ code that allowed u to add the c++ dll in the refrence menu.. All this workes fine and everything..
"
//MYDll.cpp
void __stdcall Dll_PrintIT(HDC hdc, int x, int y, int Height, int Width, HDC hdc2, int sx, int sy)
{
BitBlt(hdc,x,y,Height,Width,hdc2,sx,sy,SRCCOPY);
}

//MYDll.odl

library MyDll
{
module MyDllFunctions
{
[
helpstring("Bitblt a hdc to another"),
entry("Dll_PrintIT")
]
void __stdcall PrintBit([in] HDC hdc, [in] int x,
[in] int y, [in] int Height,
[in] int Width, [in] HDC hdc2,
[in] int sx, [in] int sy);
}
}


"
Is used to specifie the function/sub..
Now the problem is that when i now import this DLL to Vb i has transformed the HDC in to a wireHDC... and i am not abel to use the sub.... but if i change the HDC to int it works but it dosent find the correct function because BITBLT in C++ had to have an HDC variabel..
Dose anyone know how to fix this problem???
I can send source code if u want to look at the whole C++ code.. but i got the importatnt bits in.. i hope ...

 

[CassandraR]

Hi Blixten69:

I am going way out on a limb in this reply. So, please forgive me if I lead you astray.

I am not sure which function you are trying to access above, but the first one, I would start by declaring

Public Declare Sub Dll_PrintIT Lib "MYDLL" Alias "DLL_Print" ( _
    ByVal hdc As Long, _
    ByVal x As Long, _
    ByVal y As Long, _
    ByVal Height As Long, _
    ByVal Width As Long, _
    ByVal hdc2 As Long, _
    ByVal sx As Long, _
    ByVal sy As Long)

This is per Microsoft's Help file, under the item "Converting C Declarations To Visual Basic".

HTH,
Cassandra

 

[JeffTullin]

Is there some reason why you don't just call BitBlt from VB?
Declare it from the GDI library and use it directly.
(Check the API viewer for the definitions)