将std :: map迭代对象存储为CGridCtrl中的itemdata [英] Storing std::map iteration object as itemdata in CGridCtrl
问题描述
我一直在试图决定如何传达我的问题.
I have been trying to decide how to convey my problem.
我有一些地图:
typedef struct tagDemoEntryAssign
{
COleDateTime datMeeting;
CString strAssignment;
int iAssignmentType; // AJT v16.0.9
int iStudyPoint; // AJT v16.0.3
int iNextStudyPoint; // AJT v16.0.9
} S_DEMO_ENTRY_ASSIGN;
typedef std::vector<S_DEMO_ENTRY_ASSIGN> PublisherAssignments;
typedef struct tagDemoEntryEx
{
CString strName;
E_GENDER eGender;
E_POSITION ePosition;
E_APPOINTED eAppointed;
BOOL bDemonstrations; // AJT v16.0.3
PublisherAssignments vectorItemAssign; // Sorted array of S_DEMO_ENTRY_ASSIGN structures.
} S_DEMO_ENTRY_EX;
typedef std::map<CString, S_DEMO_ENTRY_EX> PublisherMap;
typedef std::map<CString, S_DEMO_ENTRY_EX>::iterator PublisherMapIter;
我最终得到一些数据,并填写了CGridCtrl
.我尝试设置单元格的项目数据.具体来说:
I end up having some data, and filling in a CGridCtrl
. I try to set the item data for the cells. Specifically:
m_Grid.SetItemData(iRowCount - 1, DEMO_COLUMN_NAME, (LPARAM)&iter->second);
当我尝试访问LPARAM数据时无效.
When I try to access the LPARAM data is it not valid.
为什么?
我认为问题与这行代码有关:
I think the problem is related to this line of code:
S_DEMO_ENTRY_ASSIGN sAssign = iter->second.vectorItemAssign.back();
我将其分配为项目数据:
I assign it as item data:
m_Grid.SetItemData(iRowCount - 1, DEMO_COLUMN_LAST_USED, (LPARAM)&sAssign);
它随后在这里被使用:
int CALLBACK CDemoPickerDlg::pfnCellCompareDate(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort)
{
CGridCellBase* pCell1 = (CGridCellBase*)lParam1;
CGridCellBase* pCell2 = (CGridCellBase*)lParam2;
if (!pCell1 || !pCell2) return 0;
S_DEMO_ENTRY_ASSIGN *psItem1 = (S_DEMO_ENTRY_ASSIGN*)pCell1->GetData();
S_DEMO_ENTRY_ASSIGN *psItem2 = (S_DEMO_ENTRY_ASSIGN*)pCell2->GetData();
// If a name has never been used the structure pointer will be null.
if (psItem1 == NULL && psItem2 == NULL)
return 0;
else if (psItem1 == NULL)
return -1;
else if (psItem2 == NULL)
return 1;
else if (psItem1->datMeeting < psItem2->datMeeting)
return -1;
else if (psItem1->datMeeting == psItem2->datMeeting)
return 0;
else
return 1;
}
我认为这是错误的:
S_DEMO_ENTRY_ASSIGN sAssign = iter->second.vectorItemAssign.back();
如果我理解正确的力学原理,那么上面的内容就是对结构进行复制.然后,我分配该副本的指针.并且副本超出了地图的迭代循环范围.
If I understand the mechanics right, the above is making a copy of the structure. Then I am assigning the pointer of this copy. And the copy goes out of scope in the iteration loop of the map.
我认为我需要存储一个指向实际iter->second.vectorItemAssign.back()
对象的指针.
I need to store a pointer to the actual iter->second.vectorItemAssign.back()
object instead I think.
推荐答案
我不得不将一行代码更改为:
I had to change one line of code to:
m_Grid.SetItemData(iRowCount - 1, DEMO_COLUMN_LAST_USED, (LPARAM)&iter->second.vectorItemAssign.back());
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