Re: PVOID and Borland data types

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Article #4426

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#4426

From: Remy Lebeau (TeamB)
Date: Mon, 06 Feb 2006 22:12

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"Mike Collins" <its@thebottomofthe.post> wrote:

> Data
> Pointer to a caller-allocated buffer containing the
> data for the value entry.
> DataSize
> Specifies the size in bytes of the Data buffer. If
> Type is any of the REG_XXX_SZ, this value must
> include the terminating zero(s).

So, you are trying to call one of the Registry functions such as RegSetValueEx() or RegQueryValueEx()?

> Can someone explain to me how to achieve this using
> the WideString or AnsiString data types that are available

AnsiString has a c_str() method, and WideString has a c_bstr() method, for the getting a pointer to the memory used for the raw characters.  Pass that pointer as the parameter.

> I need to dynamically alocate the values as I'll 
> only know them at runtime.

For example:

    AnsiString Data;
    Data.SetLength(12345);
    DWORD dwSize = Data.Length()+1;
    TheFunction(..., Data.c_str(), &dwSize, ...);

Gambit

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Subject: Re: PVOID and Borland data types
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