anxious! Wait online. Questions about calling unmanaged .exe programs in C #?

cqheshang

This thing, I think it may be a calling convention?
The plugin I wrote to MSN can't call the local file, otherwise it will go wrong

freegreat

TO:freegreat
>> You write the method outside the class, it should be fine.
C ++ build error message:
error C2201: 'myAdd': must have external linkage in order to be exported / imported

>> Then you use depends to open the dll file you edited, in which you can view the entry function name.
I read that there is this entry add, but what can not be called

frank_jojo

TO:freegreat
extern "C" static _declspec (dllexport) double Add (double a, double b) {...}

[DllImport ("MathFuncsDll1.dll", EntryPoint = "The name you see in depends", CharSet = CharSet.Auto)]
public static extern double Add (double a, double b);

frank_jojo

Like it yourself, please master help.

I have a drawing program developed by others, developed with VC6.0. And there is code.

I now want to develop another set of programs, developed with .net. In this program, you need to use a drawing program in order to draw unique graphics. Therefore, I must call the drawing program in the .net program in order to draw.

Excuse me, are there any good solutions!

freegreat

1) Modify the original program as follows:
extern "C" static _declspec (dllexport) double myAdd (double a, double b);
Error: error C2201: 'myAdd': must have external linkage in order to be exported / imported

2) Just remove the static

thank you very much!