Now need to implement such a function as described in the topic, but his knowledge shallow, consult what you need to use the API? How to achieve?

CodePudding user response:

Can search FindFirstChangeNotification functions, there are still some examples, such as
http://bbs.csdn.net/topics/280032788

CodePudding user response:

This is the code for the BCB, as for copying files with CopyFileW or the MoveFile function can

 
A, in. H file add the following code: 

//the system time -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
#include  
Private://User declarations 
HANDLE hChange; 
Int counter; 
Public://User declarations 

Two, in a. CPP file add the following code: 

__fastcall TForm1: : TForm1 (TComponent * Owner) 
: TForm (the Owner) 
{
//the default button state 
For the - & gt; Enabled=true; 
Button2 - & gt; Enabled=false; 
//shut down timer 
Timer1 - & gt; Enabled=false; 
Timer1 - & gt; The Interval=100; 
} 
//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

Void __fastcall TForm1: : Button1Click (TObject * Sender) 
{
//start monitoring C: \ temp directory file move 
HChange=: : FindFirstChangeNotification (" C: \ \ temp, "
True,//include subdirectories 
FILE_NOTIFY_CHANGE_FILE_NAME); 
//若此目录不存在
If (hChange==INVALID_HANDLE_VALUE) {
ListBox1 - & gt; The Items - & gt; Add (" C: \ temp directory does not exist or could not be opened!" ); 
//send off information to end the program 
Application - & gt; The Terminate (); 
} else {
//switch button state 
For the - & gt; Enabled=false; 
Button2 - & gt; Enabled=true; 
//record start time 
Struct time st. 
Gettime (& amp; St); 
ListBox1 - & gt; The Items - & gt; Add (" start monitoring C: \ \ temp directory file move: "+ 
AnsiString (st. ti_hour) + "_" + 
AnsiString (st. ti_min) + "_" + 
AnsiString (st. ti_sec) 
); 

//start the timer, the calculated value file changes XianGui zero 
Counter=0; 
//start the timer 
Timer1 - & gt; Enabled=true; 
} 
} 
//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

Void __fastcall TForm1: : Button2Click (TObject * Sender) 
{
//release handle 
: : FindCloseChangeNotification (hChange); 
//switch button state 
For the - & gt; Enabled=true; 
Button2 - & gt; Enabled=false; 
//the default timer state 
Timer1 - & gt; Enabled=false; 
} 
//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

Void __fastcall TForm1: : Timer1Timer (TObject * Sender) 
{
//if the thread change, back to the information 
DWORD rc=: : WaitForSingleObject (hChange, 0); 
If (rc==WAIT_OBJECT_0) {
ListBox1 - & gt; The Items - & gt; Add (" common "+ AnsiString (+ + counter) +" file set up or change or delete "); 
//remove notification now and wait for the next change notification 
: : FindNextChangeNotification (hChange); 
} 
} 
//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

Void __fastcall TForm1: : FormDestroy (TObject * Sender) 
{
//prevention unreleased directory handle 
//: : FindCloseChangeNotification (hChange); 
} 

CodePudding user response:

This is BCB6, XE wide character types such as String into a String

CodePudding user response:

Can use Microsoft undisclosed API: SHChangeNotifyRegister register a notice, and then in WM_SHNOTIFY message processing line,

This kind of implementation method without the timer,

CodePudding user response:

To learn,

CodePudding user response:

With the clock also can yet be regarded as a solution

CodePudding user response:

To learn, this is used to copy someone else's U disk?