Re: Stl map and CString trouble

Norbert Unterberg <nunterberg@newsgroups.nospam>
Sat, 04 Oct 2008 08:22:25 +0200
Scoots schrieb:

" Why do you need pointers for the map and the bytes?"
the map is on the heap, so I need a pointer to it. The bytes are
an allocated chunk on the heap, and so I need the addresses for an
application specific task.

It is unusual to allocate a standard container on the heap. The the container's
data is always allocated on the heap no matter where the container object is. By
putting the container itself on the heap you do add addiatinal work to free the
memory andkeep track of correct deallocation. But all that should not make any
difference to your problem.

I tried this little app:

#include <iostream>
#include <string>
#include <atlstr.h>
#include <map>

using namespace std;

typedef unsigned char byte;
map<CString, byte*> g_VarMap;

int main()
    g_VarMap["AA"] = (byte*)0x003a9e0b;
    g_VarMap["BB"] = (byte*)0x003a9e1b;
    g_VarMap["XX"] = (byte*)0x003a9c95;
    g_VarMap["YAR"] = (byte*)0x003a9c96;
    g_VarMap["YY"] = (byte*)0x003a9c94;

    map<CString, byte*>::iterator i = g_VarMap.find("YAR");

    if (i != g_VarMap.end())
        cout << i->first << endl;
    return 0;

and it works fine for a ANSI build, so the problem is somewhere else.

Are you using MFC in some parts of your app? MFC CString and ATL CString used to
be two different classes.

Anyway, how do you assign to the map?

It's over several hundred to thousand lines of parsing a file, but it
boils down to:

int MapVar(string p_pszName, char* p_pszType)
        //If bool, update boolspace vars.
        if (0 == strcmp("BOOL",p_pszType))
                if (g_pbCurrentBoolSpace + sizeof(bool) >
(bool*)g_piCurrentIntSpace) //this also handily catches if it's
already maxed!
                        return 0;
                (*g_VarMap)[p_pszName] = (byte*)
                g_pbCurrentBoolSpace += sizeof(bool);

        //If int, update int vars.
        if (0 == strcmp("INT", p_pszType))
                if (g_piCurrentIntSpace + sizeof(int) >
(int*)g_pfCurrentFloatSpace) //this also handily catches if it's
already maxed!
                        return 0;
                (*g_VarMap)[p_pszName] = (byte*)
                g_piCurrentIntSpace += sizeof(int);

        //If float, update float vars.
        if (0 == strcmp("FLOAT", p_pszType))
                if (g_pfCurrentFloatSpace + sizeof(float) >
(float*)g_VarSpaceMax) //
this also handily catches if it's already maxed!
                        return 0;
                (*g_VarMap)[p_pszName] = (byte*)
                g_pfCurrentFloatSpace += sizeof(float);
        return 1;



I prefer to use CStrings if I can, for the utility and the unicode

Well, the code you show uses char*, std::string and CString all in one function.
That is neither unicode aware nor "prefer to use CStrings"....


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