Re: Overwrite data_seg variable

"Ben Voigt" <rbv@nospam.nospam>
Wed, 24 Jan 2007 17:32:31 -0600
"cleohm" <> wrote in message

Thanks for your reply. I did the following but still not working,
probably I
handle the variables incorrectly. Can help me identify them?


#pragma data_seg(".SHARDAT")
TCHAR szData[10]=_T("");

That's not valid, you should use a compound initializer with braces to
initialize a compound such as an array. Data in shared segments has to be
initialized according to certain rules:

#pragma data_seg()

LRESULT __declspec(dllexport)__stdcall CALLBACK KeyboardProc(int nCode,
WPARAM wParam, LPARAM lParam)
CString strTxt = szData;

BOOL __declspec(dllexport)__stdcall InstallHook(LPCTSTR lpExternalData)
_tcscpy(szData, lpExternalData);


void CDlg::Hook(LPCTSTR lpData)
static HINSTANCE hinstDLL = LoadLibrary(_T("Hook.dll"));
typedef BOOL (CALLBACK *inshook)(LPCTSTR);
inshook instkbhook = (inshook)GetProcAddress(hinstDLL, "InstallHook");

"Alex Blekhman" wrote:

"cleohm" wrote:

Thanks for your reply. The following list 2 codes
(Hook.cpp and CDlg.cpp):


#pragma data_seg(".SHARDAT")
static HHOOK hkb=NULL;
LPCTSTR lpData=_T("");
#pragma data_seg()

LRESULT __declspec(dllexport)__stdcall CALLBACK
KeyboardProc(int nCode,
WPARAM wParam, LPARAM lParam)
    // Require the use of lpData here
    return CallNextHookEx(hkb, nCode, wParam, lParam);

Just reread KB article KB100634 again.

NOTE: If the block contains pointers, this can be a problem.
If the pointer holds the address of a variable not in the
shared data segment, this address is valid only in one
process space.

You need to use shared array if you want to share whole

#pragma data_seg(".SHARDAT")
TCHAR szData[42] = { 0 };
#pragma data_seg()


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