I don't know if I've setup the thread correctly or not, but its behavoir isn't what I'd expect. I'm creating the thread within a BN_CLICKED message -
typedef struct my_TNFO
-
{
-
HANDLE h_event;
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HANDLE h_thread;
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DWORD thread_id;
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BOOL running;
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BOOL init;
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BOOL canceled;
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} TNFO;
-
-
...
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if(HIWORD(wParam) == BN_CLICKED)
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{
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memset(&tnfo, 0, sizeof(tnfo));
-
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tnfo.running = TRUE; // thread active
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tnfo.init = TRUE; // thread started
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tnfo.canceled = FALSE; // user controlled
-
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tnfo.h_event = CreateEvent(NULL, TRUE, FALSE, NULL);
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tnfo.h_thread = CreateThread(...);
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...
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}
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...
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the thread function actually calls a recursive directory parser function. I've set it up as -
DWORD WINAPI threads_ParseDisc(LPVOID lParam)
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{
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TNFO *tmp = (TNFO *)lParam;
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if(tmp->init == TRUE)
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{
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tmp->init = FALSE;
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// call recursive function
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}
-
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while(WaitForSingleObject(tmp->h_event, INFINITE) != WAIT_OBJECT_0)
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Sleep(1000);
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CloseHandle(tmp->h_event);
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CloseHandle(tmp->h_thread);
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tmp->running = FALSE;
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return 0;
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}
in the recursive function, I've tried both Send and PostMessage. -
...
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HANDLE hFind = INVALID_HANDLE_VALUE;
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hFind = FindFirstFile(tmp, &wfd);
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if(hFind == INVALID_HANDLE_VALUE)
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{
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PostMessage(hwnd_to_main, WMU_DISC_DONE, 0, 0);
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return;
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}
-
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if(tmp->canceled == TRUE)
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{
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PostMessage(hwnd_to_main, WMU_DISC_CANCEL, 0, 0);
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return;
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}
-
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do
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{
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// if directory, call self... (path, tnfo);
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// if file, populate list view control
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} while(FindNextFile(...) != 0);
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FindClose(hFind);
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++progd->count;
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PostMessage(hwnd_to_main, WMU_DISC_COUNT, (WPARAM)0, (LPARAM)(ULONG)progd->count);
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progd->count was devised to stop the thread when the recursion ended by posting a message to the main window. When it reaches 1, the def procedure sends the WMU_DISC_DONE message to set the event
All that *appears* to work; however, if I cancel the recursion thread, the list view continues to populate for a bit and then deletels all but 1 item though I send the message LVM_DELETEALLITEMS.
If I move the (tmp->canceled == TRUE) test inside of the do-while, the app gets loopy. Any idea as to why this behavoir occurs?
If more information is needed, please ask.
TIA
I guess you would save the current tab in a stack. You could pop/push around the various tabs.
4  1523 
OK. You have created an event object and a thread object and the thread is listening for an event. Where is the event?
I think you need to call SetEvent to put your event object into the signaled state. Otherwise, WaitForSingleObject will hear nothing.
Thank you for the reply... as always, I appreciate your time and feedback.
The problem went away after moving the (tmp->canceled == TRUE) test to the bottom of the do-while. I still have no clue as to way the program bogged down if that test was at the top of the loop.
SetEvent was called within one of the WM_USER messages. The thread ended, but had a sort of delayed effect before. Moving the canceled test "fixed it."
Do you know of a way store the previously selected tab of a tab control? All I can get is the current selection, which isn't helpful for what I need to do.
TIA
I guess you would save the current tab in a stack. You could pop/push around the various tabs.
I wish that I could learn to think like a programmer; thank you for that! Just what it needed. :)
Cheers
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