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POFreeing memory by using free() whoes pointer is inside a pointer pointing to structure
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copied!<p>Hey! I know title of question is very scary but I still I am not able to express the problem in single line!</p> <p>So Here I go:</p> <p>There is a Data Pointer say DataPtr which is pointing to a dynamically allocated memory and Another Structure Pointer say StructPtr which also points to a Dynamically allocated structure.</p> <p>And These both are in another structure,say OuterStructure.</p> <p>There is a Linked List which contains Pointer to OuterStructure. </p> <pre><code>struct StructONE { int a; char b; float c; }; struct InnerStruct { char a; int b; }; struct StructTWO { int Num; char * DataPtr; struct InnerStruct * StructPtr; }; struct LinkList { int NodeNum; int NodeType; /* To Indicate Whether Pointer is of StructOne or StructTwo */ void * Ptr; /* This can be of type StructONE or StructTWO */ struct LinkList * Next; }; LinkList * Start; void main() { /* Structure Declarations */ InnerStruct * InnerStructure; StructONE * OneStruct; StructTWO * TwoStruct; /* Fill up all the Structure */ InnerStructure= (InnerStruct *)calloc(100,sizeof(InnerStruct)); InnerStructure->a='a'; InnerStructure->b=5; OneStruct= (StructONE *)calloc(100,sizeof(StructONE)); TwoStruct= (StructTWO *)calloc(100,sizeof(StructTWO)); TwoStruct->Dataptr=(char *) calloc(10,sizeof(char)); TwoStruct->StructPtr= InnerStructure; /* Add these to Linked List void Add_to_Linked_List(int NodeNum,int NodeType,void *ptr) */ Add_to_Linked_List(1,1,OneStruct); Add_to_Linked_List(2,2,TwoStruct); /* Everything is Okey Till Here. Now When I want to delete a node from linked list, First I have to release Memory pointed by DataPtr and StructPtr. */ DeleteNode(1); } /* End of Main */ </code></pre> <p>The Code for DeleteNode is like this:</p> <pre><code>void DeleteNode(int Num) { LinkList * NodePtr,*TempNode; NodePtr= Start; while(NodePtr->NodeNum!=Num) NodePtr=NodePtr->Next; /* Now NodePtr points to desired node */ if(NodePtr->NodeType==1) /* Pointer is StructONE Type */ { free(NodePtr->Ptr); TempNode->Next=NodePtr->Next; free(NodePtr); return; } else { /* Now the Problem Begins.... In StructTWO type, I have to release Memory allocated for DataPtr as well Struct Ptr */ free((NodePtr->ptr)->DataPtr); /* This Line Generates Error as Error C2227: left of '->DataPtr' must point to class/struct/union/generic type */ } } </code></pre> <p>What Should I do??</p> <p>I know I have written code terribly... but Have to write this much complex!! :(</p> <p>Thank you for reading this as well!!</p>

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