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Article #10501

Re: CopyMemory API problem

#10501
From: Bob Gonder
Date: Tue, 13 Apr 2004 02:47
34 lines
2410 bytes
Martin C wrote:

>> Re-reading the help, I think this line might also be wrong:
>> >    CopyMemory(&WriteAddress, &ReadAddress, Granularity); // Error shows
>>
>> More likely to be
>>     CopyMemory(WriteAddress, ReadAddress, Granularity);
>
>First of all there is no relation between 0013F584 and the 3 parameters at
>all. I've checked this twice.

Which means you aren't getting the correct values to the Copy.
Check again, but this time, look at _where_ those 3 values are
located. I'm thinking ReadAddress is located at (or very near) that
address.  That's a big clue that you are passing the Address of
ReadAddress when it wants the Value of ReadAddress.

> Now When I remove the (&)  all I receive is
>compiler error as shown below, as the CopyMemory parameter requires Void,
>and what I am passing is integer.
>
>[C++ Error] Unit1.cpp(120): E2034 Cannot convert 'int' to 'void *'
>[C++ Error] Unit1.cpp(120): E2342 Type mismatch in parameter '__dest'
>(wanted 'void *', got 'int')

WriteAddress and  ReadAddress should really be addresses not ints.

char*WriteAddress;
char*ReadAddress;
or void* could work too.

Or, you could override (cast) their types:

     CopyMemory((void*)WriteAddress,(void*) ReadAddress, Granularity);
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From: Bob Gonder <notbg@notmindspring.invalid>
Newsgroups: borland.public.cppbuilder.nativeapi
Subject: Re: CopyMemory API problem
Date: Mon, 12 Apr 2004 19:47:25 -0700
Organization: MindSpring Enterprises, Inc.
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