The error message "Memory cannot be read". . . . How to deal with it?

ghost0216

The code compiles and runs, but when I execute the program, it prompts "Some memory cannot be read." What to do? ?
CCustumInfoSet cSet (&theApp.db);
CBookRoomView * brvDlg;
brvDlg-> m_list.SetExtendedStyle (LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES);
Ranch
cSet.Open ();
CODBCFieldInfo info;
for (int i = 0; i <cSet.GetODBCFieldCount (); i ++) {
cSet.GetODBCFieldInfo (i, info);
brvDlg-> m_list.InsertColumn (i, info.m_strName, LVCFMT_LEFT, _tcslen (info.m_strName));
}
cSet.Close ();

hxl395539

I also made a mistake, it was connected to the database, and there was an assertion error

shamingjia

CBookRoomView *brvDlg;
brvDlg-> m_list.SetExtendedStyle(LVS_EX_FULLROWSELECT| LVS_EX_GRIDLINES);
=============
CBookRoomView *brvDlg is just a pointer, just start to use it without instantiation, of course it will be wrong.

19861201

This kind of error is generally that a pointer points to the wrong place, depending on the situation, if it is a very small number, for example, 0x00000023
Then maybe a pointer is empty, and an offset is added.
If it is a relatively large number, such as 0x5FFFFFFF, it may be that the pointer is not initialized, just like your brvDlg;

When you pop up an error message, click Retry first, then click Debug, and enter the debugging to see what the problem is.

The most obvious mistake is here
CBookRoomView *brvDlg;
brvDlg-> m_list.SetExtendedStyle(LVS_EX_FULLROWSELECT| LVS_EX_GRIDLINES);
brvDlg is called without assigning a value, of course it is wrong

ntcw2003

[Quote=Quote the reply fromshamingjiaon the 2nd floor:]
CBookRoomView *brvDlg;
brvDlg-> m_list.SetExtendedStyle(LVS_EX_FULLROWSELECT| LVS_EX_GRIDLINES);
=============
CBookRoomView *brvDlg is just a pointer, just start to use it without instantiation, of course it will be wrong.
[/Quote]
Try it

zcyzcq

CBookRoomView *brvDlg = GetYourDlg();//First get the DLG you want to modify

我不吃土豆

Try catch to see if it is a recognizable exception

Jannic

They are generally wild pointers

huangh2006

Somewhere the memory cannot be read
Many are 0x000000
Null pointer

xyring0108

I agree with the people upstairs, CBookRoomView *brvDlg is not initialized.