BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Help required with Synchronize function          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Usage) View previous topic :: View next topic   Author Message Muhammad Momin Rashid Guest Posted: Sun Nov 23, 2003 9:23 am    Post subject: Help required with Synchronize function Hello, I have a recursive function which calculates the size of a given directory (and directories below that level). I need to update the TreeView Component with the directory struction along with the information returned by this function. Everything was working smoothly before i tried switching to using threads. The function that updates the TreeView Component needs two parameters (Current Node and Value for Child Node), and it should return a pointer to new Child node created. I am not sure how to make a call this function using Synchronize, I tried Synchronize (UpdateDir) but it does not compile as UpdateDir need parameters and returns a value. Can anyone guide me on how to accomplish this? Regards, Muhammad Momin Rashid. Back to top Remy Lebeau (TeamB) Guest Posted: Sun Nov 23, 2003 10:43 pm    Post subject: Re: Help required with Synchronize function "Muhammad Momin Rashid" <momin (AT) hotmail (DOT) com> wrote Quote: The function that updates the TreeView Component needs two parameters (Current Node and Value for Child Node), and it should return a pointer to new Child node created. I am not sure how to make a call this function using Synchronize, I tried Synchronize (UpdateDir) but it does not compile as UpdateDir need parameters and returns a value. Can anyone guide me on how to accomplish this? You need to store your parameters into separate members of the thread class first, and then have Synchronize() call a method that takes no parameters, which then calls the real function passing it the variables. For example: class TMyThread : public TThread { private: TTreeNode *CurrentNode; AnsiString ChildValue; TTreeNode *NewNode; //... void __fastcall DoUpdateDir(); //... }; void __fastcall TMyThread::Execute() { //... CurrentNode = whatever; ChildValue = whatever; Synchronize(DoUpdateDir); // use NewNode as needed //... } void __fastcall TMyThread::DoUpdateDir() { NewNode = UpdateDir(CurrentNode, ChildValue); } Gambit Back to top Muhammad Momin Rashid Guest Posted: Mon Nov 24, 2003 12:45 am    Post subject: Re: Help required with Synchronize function Hi, Thanks for the responsse. I had already tried this solution, but the problem is a bit complicated given that the fucntion (that is calculating the size of directory = file sizes + size of sub directories) is a recursive one. If a sub directory is found that a recursive call is generated, and the values of CurrentNode and CurrentValue gets changed. The following code should elaborate my point. Probably I am overlooking something very simple here. void __fastcall TMyThread::Execute() { RecursiveFunction(StartNode, StartNodeValue) } void __fastcall TMyThread::RecursiveFunctin(PassedCurrentNode, PassedCurrentNodeValue) { //... CurrentNode = whatever; ChildValue = whatever; for each item in the CurrentDirectory If ( Sub Directory Found ) { Synchronize(DoAddDir); dirSize += RecursiveFunction(subdir, subdirvalue) } else (if file found) { // ... dirSize += file size } // if recursive call happens NewNode gets changed //... Synchronize (DoUpdateDir) } Regards, Muhammad Momin Rashid. "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote Quote: "Muhammad Momin Rashid" <momin (AT) hotmail (DOT) com> wrote in message news:3fc07c9a (AT) newsgroups (DOT) borland.com... The function that updates the TreeView Component needs two parameters (Current Node and Value for Child Node), and it should return a pointer to new Child node created. I am not sure how to make a call this function using Synchronize, I tried Synchronize (UpdateDir) but it does not compile as UpdateDir need parameters and returns a value. Can anyone guide me on how to accomplish this? You need to store your parameters into separate members of the thread class first, and then have Synchronize() call a method that takes no parameters, which then calls the real function passing it the variables. For example: class TMyThread : public TThread { private: TTreeNode *CurrentNode; AnsiString ChildValue; TTreeNode *NewNode; //... void __fastcall DoUpdateDir(); //... }; void __fastcall TMyThread::Execute() { //... CurrentNode = whatever; ChildValue = whatever; Synchronize(DoUpdateDir); // use NewNode as needed //... } void __fastcall TMyThread::DoUpdateDir() { NewNode = UpdateDir(CurrentNode, ChildValue); } Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Mon Nov 24, 2003 1:29 am    Post subject: Re: Help required with Synchronize function "Muhammad Momin Rashid" <momin (AT) hotmail (DOT) com> wrote Quote: I had already tried this solution, but the problem is a bit complicated given that the fucntion (that is calculating the size of directory = file sizes + size of sub directories) is a recursive one. If itis such a problem to accomplish, then you'll just have to populate the TreeView separately. Run the recursive function first and just gather all the necessary data (such as into a double-linked list so that you can preserve the tree hierarchy of the data), and then popuplate the TreeView afterwards with the gathered data, not while the traversal is occuring. The alternative is to populate the TreeView beforehand with the folder structure, and then have the thread just update the existing nodes with the data without needing to add anything new to it. Gambit Back to top Muhammad Momin Rashid Guest Posted: Tue Nov 25, 2003 8:22 am    Post subject: Re: Help required with Synchronize function I was afraid it would come to something like that, but I was hoping for a more elegant way of accomplishing this task. Regards, Muhammad Momin Rashid. "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote Quote: "Muhammad Momin Rashid" <momin (AT) hotmail (DOT) com> wrote in message news:3fc154c4 (AT) newsgroups (DOT) borland.com... I had already tried this solution, but the problem is a bit complicated given that the fucntion (that is calculating the size of directory = file sizes + size of sub directories) is a recursive one. If itis such a problem to accomplish, then you'll just have to populate the TreeView separately. Run the recursive function first and just gather all the necessary data (such as into a double-linked list so that you can preserve the tree hierarchy of the data), and then popuplate the TreeView afterwards with the gathered data, not while the traversal is occuring. The alternative is to populate the TreeView beforehand with the folder structure, and then have the thread just update the existing nodes with the data without needing to add anything new to it. 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