user interface - Weird outputs from SendMessage on 64-bit Windows -


i'm sort of new windows gui programming. got code works fine on 32-bit windows go weird on 64-bit win7 (same exe).

lwg_cedit_get( m_hwnd, idc_edit_num_test, g_tmp_str, 4096 );

where lwg_cedit_get defined as:

#define lwg_cedit_get(h,id,v,m) \ ((*((u32*)(v))=(m)),sendmessage(getdlgitem((h),(id)),em_getline,0,(lparam)(char*)(v))

on winxp 32, gives me g_tmp_str="1" (of course inputted '1' textfield in dialog). but, on win7 64, gives me g_tmp_str=""(oops, weird character can't shown in stackoverflow, whatever, odd char. [0]=49'1' [1]=16'').

generally speaking, 32bit exe program can work flawlessly on win7 64, so, why program failed? thanks.

edit 1: iswindowsunicode(m_hwnd) returns false.

see last comments of topic.


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