COM

[Duncan Winn]

Does anyone know how to access a COM component from VC++ 7???

Thanks for any help, and sorry if this is an inappropriate place to post
this question, but I did not know which user group to post it on.

[Carl Daniel [VC++ MVP]]

Duncan Winn wrote:

Does anyone know how to access a COM component from VC++ 7???

For starters, try looking up

#import
CoInitialize
CoCreateInstance

in your VC/MSDN documentation. There are myriad COM samples, including 136
samples in the Windows Platform SDK (which you can download from
http://www.microsoft.com/msdownload/...dk/sdkupdate/).

-cd

[chris]

If the component includes a type library, you can import
the type library and use an interface pointer to access
methods. Something like this:
#import "MyComponent.dll" named_guids //import the dll

#include "MyComponent.tlh" //include the type library

Declare an interface pointer to the class:
MyCom::IComCls pMyCom;

Use the pointer to create an instance of the object
pMyCom.CreateInstance(MyCom::CLSID_CMyCom);

Use the pointer:
pMyCom->SomeWork(param1, param2);
If no type library, you can do the following:
#include "MyComponent_i.c"

IComClasPtr pMyCom; //define an interface pointer
HRESULT hr;

Use the pointer to create an instance of the object
hr = pMyCom.CreateInstance(CLSID_CMyCom);
//some code here to check if succeeded

Use the pointer:
hr = pMyCom->SomeWork(param1, param2);

-----Original Message-----
Does anyone know how to access a COM component from VC++ 7???
Thanks for any help, and sorry if this is an inappropriate place to postthis question, but I did not know which user group to post it on.

.

[Carl Daniel [VC++ MVP]]

chris wrote:

If the component includes a type library, you can import
the type library and use an interface pointer to access
methods. Something like this:
#import "MyComponent.dll" named_guids //import the dll

#include "MyComponent.tlh" //include the type library

You should never directly #include a .tlh file - the #import directive
already includes the file for you.

-cd