求解：关于对话框接收消息的问题

Question

HWND hWnd;
hWnd=GetDlgItem(ghWnd,IDC_EDIT1);
char pCold[2048]="\0";
GetWindowText(hWnd,(LPTSTR)pCold,sizeof(pCold)); //SendMessage(hWnd,WM_GETTEXT,0,(LPARAM)(LPCTSTR)pCold);//
if(strcmp(pCold,"\0")!=0)
strcat(pCold,"\r\n"); strcat(pCold,(LPCTSTR)p);
SendMessage(hWnd,WM_SETTEXT,0,(LPARAM)(LPCTSTR)pCold);为何第一个消息发送（被注释掉的）总是得不到字符串呢？
没办法，只好用GetWindowText()但是为什么？谢谢：）

Answer 1

SendMessage(hWnd,WM_GETTEXT,(WPARAM)sizeof(pCold),(LPARAM)(LPCTSTR)pCold);

Answer 2

::SendMessage(hwnd,WM_GETTEXT,sizeof(pCold),(int)pCold);