Calling API asynchronously?

[jsteph]

Hi,
I'm call SendMessage, sending info from one vb app to a textbox in another. I'm trying to act on this in the Change event of the target textbox, but I'm getting the error "An outgoing call cannot be made since the application is dispatching an input-synchronous call"

I'm assuming that the Target's processing of the SendMessage that it recieved--which triggers the textbox's Change event--must complete before I can make another call to some other ActiveX control. In the Change event, I'm calling another activex--not the one that sent the SendMEssage. So...is there a way to make the SendMessage call asynchronous? Thanks,
--Jsteph

 

[strongm]

You may want to have a look at PostMessage

 

[jsteph]

strongm,
Thanks, I had already looked at that, but it seems that the last argument wont accept a string. The declare for the SendMessage has Any as the type for that last arg, but PostMessage had Long. I tried to change the declare to Any and to String, but couldn't get it to pass a string.

This brings another question: When an api declare has a long-pointer to string as an argument, how do I pass a vb string to this? I've tried bizzare convolusions of using the AddressOf operator to point to a function that returns a string, but I'm just not sure how I can get VB to pass a string pointer to deal with this type of argument. Tnanks for any more insight on this,
--jsteph

 

[IWarez]

You can't pass strings as parameters to windows that don't belong to your process as the process can't access variables within your address space. A solution would be allocating memory within the other process memory space and storing the string there.