About parameter transfer of the dynamic library interface

In the past two daysProgramC To call the corresponding function in dynamic library.

 

Interface prototype in

Prototype: (the actual name is omitted in the example)

Bool openviewa (Cstring strpro1, cstring strpro2, cstring strpro3)

{

...

Return ture;

}

Because C has a similar interface openviewcc, copy it and change its name. Its original prototype is: Note parameter type

Bool openviewcc (Lpcstr strpro1,LpcstrStrpro2,LpcstrStrpro3)

{

...

Return ture;

}

The prototype of the called interface added in C is

 

Extern "C" _ declspec (dllexport) bool openviewa (Cstring strpro1, cstring strpro2, cstring strpro3)

{

// Define the function pointer of the same type in a to be called

Typedef bool (* func )();

 

// Obtain the corresponding function interface from the OBC dynamic library

Func proc = (func) getprocaddress (m_hadll, "openviewa ");

// If a function exists, call it directly.

If (null! = Proc)

{

 

Return proc (strpro1, strpro2, strpro3 );

 

}

 

// If the function does not exist, false is returned.

Return false;

}

 

 

Results An exception occurs during each call. It was later found that it was a parameter problem. The parameter types of interfaces in master C and dynamic library a must be strictly consistent. Either cstring or lcpstr. Otherwise, exceptions are not surprising.

 

Note the parameter type of the interface.