[Lazarus] SendMessage Fix.

[Justin Smyth]

SendMessage on win64 bug is caused by TCopyDataStruct struct being wrong, 
i've just proven it with the help of dmitry boyarintsev  - changing the 
first part of the data structure to a PtrUInt and it works. it was a dword.

for me i just use my own stuct but i suggest we get a TCopyDataStruct64 
added in. this would solve the issue.

----- Original Message ----- 
From: "John vd Waeter" <john at jvdw.nl>
To: "Lazarus mailing list" <lazarus at lists.lazarus.freepascal.org>
Sent: Friday, April 23, 2010 7:58 PM
Subject: Re: [Lazarus] SendMessage Bug Work Around.


> AFAIK: In Windows
>
> PostMessage puts a message in the queue and returns immediately.
>
> SendMessage puts the message in the queue and returns with a result after 
> the message has been handled.
>
> But I might be wrong...
>
> John
>
> Michael Schnell wrote:
>> I now found that SendMessage provides a Result, while PostMessage only
>> returns a success flag. So they are less similar than I thought (and the
>> Windows API definition is still more cryptic :( )
>>
>> -Michael
>
>
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