Problems such as the topic
This is to create a thread

 
Void __fastcall Tfrm_Main: : tv_RightClick (TObject * Sender) 
{
//click on the location of the node information 
TTreeNode * tn=tv_Right - & gt; GetNodeAt (pX, pY); 
If (tn==NULL) 
{
return; 
} 
Tv_Right - & gt; Selected=tn; 
Lbl2 - & gt; Caption=tv_Right - & gt; Selected - & gt; The Text; 
//using thread to query SeachDataHD 
 HANDLE hThread=CreateThread (NULL, 0, SeachDataHD, NULL, 0, NULL); 
The CloseHandle (hThread);  
For (int I=0; I & lt; This - & gt; ComponentCount; I++) 
{
If (this - & gt; The Components [I] - & gt; TSpeedButton ClassNameIs (" ")) 
{
TSpeedButton * BTN=(TSpeedButton *) this - & gt; The Components [I]; 
If (BTN - & gt; Name. Pos (" btn_chklst_ ")) 
{
The delete BTN. 
i--; 
} 
} 
} 
} 

This is a thread function

 DWORD WINAPI SeachDataHD (LPVOID lpParamter) 
{
Frm_Main - & gt; Func_DrawGrid (frm_Main - & gt; Tv_Right - & gt; Selected - & gt; The Text); 
} 

When running in the thread, called frm_Main - & gt; Tv_Right - & gt; Selected - & gt; The Text, I have to make a mistake, I followed, found frm_Main - & gt; Tv_Right is empty

CodePudding user response:

When it's operating in the thread the VCL interface controls the Synchronize with synchronization method