memcpy的疑问.讨论一下
空中猎手 2004-03-23 10:19:19 struct SM
{
char sSrc[1024];
};
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
SM *P = new SM;
AnsiString sDTID=Edit1->Text;
char *temp=sDTID.c_str() ;
memcpy((*P).sSrc,temp,strlen(temp));
Edit2->Text = AnsiString((*P).sSrc);
delete P;
}
void __fastcall TForm1::Button1Click(TObject *Sender)
{
SM *P = new SM;
AnsiString sDTID=Edit1->Text;
char *temp=sDTID.c_str() ;
memcpy((*P).sSrc,temp,strlen(temp));
Edit2->Text = AnsiString((*P).sSrc);
delete P;
}
为什么__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)这段执行后,Edit2的内容会和Edit1的内容不一样,会是Edit1的内容再加个尾巴.而void __fastcall TForm1::Button1Click(TObject *Sender)这段执行后,Edit1和Edit2的内容一样.讨论一下.请大家多多发言