C / C++ / MFC

gizmokaka wrote:

That is of course after I'm allocation memory for the colName array, and each of it's members.

char **myArray = malloc(sizeof(char *) * 10);
int i;
 
for(i = 0; i < 10; i++)
{
    myArray[i] = malloc(sizeof(char) * 15);
}

if( data.colName ) /* colName != NULL */
{
    int i;
    for( i=0; i < data.NameCount; ++i )
    {
        if( data.colName[i] ) /* data.colName[i] != NULL */
        {
            free(data.colName[i]);
            data.colName[i] = NULL;
        }
    }
    free(data.colName);
    data.colName = NULL;
}

//t = a pointer to table_rec
//local_data = pointer to data 
for(i = 0 ; i < width ; i++)
{
    free(t->local_data->colName[i]);
}
free(t->local_data_colName);

assert(t != NULL);
assert(t->local_data != NULL);
assert(t->locat_data->colName != NULL);
 
for(i = 0 ; i < width ; i++)
{
    assert(t->local_data->colName[i] != NULL);
     
    free(t->local_data->colName[i]);
}
 
free(t->local_data_colName);

#include <stdio.h>
#include <string.h>
#include <malloc.h>


void main ()
{
	int num = 2;
	char** str_array;
	char str1[] = "first string";
	char str2[] = "second string";

	str_array  = (char**)malloc(sizeof(char*)*num);
	str_array[0] = (char*)malloc(sizeof(char)*strlen(str1));
	str_array[1] = (char*)malloc(sizeof(char)*strlen(str2));
	strcpy (str_array[0],str1);
	strcpy (str_array[1],str2);
	
	printf("%s \n",str_array[0]);
	printf("%s \n",str_array[1]);

	free(str_array[0]);//error ocurres
	free(str_array[1]);
	free(str_array);


}

gizmokaka wrote:

str_array[0] = (char*)malloc(sizeof(char)*strlen(str1));
str_array[1] = (char*)malloc(sizeof(char)*strlen(str2));
strcpy (str_array[0],str1);
strcpy (str_array[1],str2);

Element string_to_element(const char* val)
{
	Element localElem = malloc(sizeof(val));
	strcpy((char*)localElem , val);
	return localElem;
}

const char* element_to_string(Element e)
{
	int i;
	const char* localStr = (char*)malloc(sizeof(char)*(strlen((char*)e)+1));
	
	for (i = strlen(localStr) ; i > 0 ;i--)
		((char*)e)[i] = NULL;

	strcpy(localStr , (char*)e);
	return localStr;
}
void string_free_func(Element strElem)
{
	char* string;
	if(strElem == NULL)
        return;
	string = (char*)strElem;
	free(string); //error occurs 

}


void main()
{
	char* str2;
	char* str1 = "simple string";
	Element e1 , e2;
	
	e1 = string_to_element(str1);
	str2 = element_to_string(e1);
	
	string_free_func(e1);
}

void main ()
{
	int num = 2<code>, i</code>;
	char** str_array;
	char str1[] = "first string";
	char str2[] = "second string";

	<code>str_array=NULL;</code>
	str_array  = (char**)malloc(sizeof(char*)*num);
	<code>for(i=0;i<num,i++) str_array[i]=NULL;</code>
	str_array[0] = (char*)malloc(sizeof(char)*strlen(str1));
	<code>for(i=0;i<strlen(str1),i++) str_array[0][i]=NULL;</code>
	str_array[1] = (char*)malloc(sizeof(char)*strlen(str2));
	<code>for(i=0;i<strlen(str2),i++) str_array[1][i]=NULL;</code>
	strcpy (str_array[0],str1);
	strcpy (str_array[1],str2);
	
	printf("%s \n",str_array[0]);
	printf("%s \n",str_array[1]);

	<code>if(str_array[0]!=NULL)</code>
		free(str_array[0]);
	<code>if(str_array[1]!=NULL)</code>
		free(str_array[1]);
	<code>if(str_array!=NULL)</code>
		free(str_array);
}

Mark Salsbery wrote:

Typically you'd use DestroyWindow() to destroy a window but with MFC doc/view

bob16972 wrote:

Sometimes cause and effect is about all I have to go off of when the MFC source calls the win32 api internally

Mark Salsbery
Microsoft MVP - Visual C++

BOOL CMyDoc::CanCloseFrame(CFrameWnd* pFrame) 
{	int nError = 0;

	//Closing the active window
	CView* pFrmView = pFrame->GetActiveView ();
	if (pFrmView->IsKindOf (RUNTIME_CLASS (CFormView)))
		return TRUE;
	
	//Closing automatically all secondary windows when the main one is closed by the user
	POSITION pos = GetFirstViewPosition ();
	while (pos)
	{	CView* pView = GetNextView (pos);
		if (pView->IsKindOf (RUNTIME_CLASS (CFormView)))
		{	CFrameWnd* pTempFrame = pView->GetParentFrame ();
			if (pTempFrame)
				pTempFrame->DestroyWindow ();
		}
	}
	
	//Asking to save changes and so on.
	return CDocument::CanCloseFrame(pFrame);
}