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VCCListCtrl显示长字符串自定义类
1.h
1 #pragma once 2 3 4 // CMyListCtrl 5 6 class CMyListCtrl : public CListCtrl 7 { 8 DECLARE_DYNAMIC(CMyListCtrl) 9 10 public: 11 CMyListCtrl(); 12 virtual ~CMyListCtrl(); 13 14 CString GetItemText(int nItem, int nSubItem) const; 15 void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct); 16 17 protected: 18 DECLARE_MESSAGE_MAP() 19 };
2.cpp
1 // MyListCtrl.cpp : 实现文件 2 // 3 4 #include "stdafx.h" 5 #include "YdTool.h" 6 #include "MyListCtrl.h" 7 8 #ifdef _AFX 9 #ifdef _DEBUG 10 #define new DEBUG_NEW 11 #undef THIS_FILE 12 static const char THIS_FILE[] = __FILE__; 13 #endif 14 #endif 15 16 // CMyListCtrl 17 18 IMPLEMENT_DYNAMIC(CMyListCtrl, CListCtrl) 19 20 CMyListCtrl::CMyListCtrl() 21 { 22 23 } 24 25 CMyListCtrl::~CMyListCtrl() 26 { 27 } 28 29 30 BEGIN_MESSAGE_MAP(CMyListCtrl, CListCtrl) 31 END_MESSAGE_MAP() 32 33 34 35 // CMyListCtrl 消息处理程序 36 37 38 CString CMyListCtrl::GetItemText(int nItem, int nSubItem) const 39 { 40 ASSERT(::IsWindow(m_hWnd)); 41 LVITEM lvi; 42 memset(&lvi, 0, sizeof(LVITEM)); 43 lvi.iSubItem = nSubItem; 44 CString str; 45 int nLen = 640; 46 int nRes; 47 do 48 { 49 nLen *= 2; 50 lvi.cchTextMax = nLen; 51 lvi.pszText = str.GetBufferSetLength(nLen); 52 nRes = (int)::SendMessage(m_hWnd, LVM_GETITEMTEXT, (WPARAM)nItem, 53 (LPARAM)&lvi); 54 } while (nRes >= nLen-1); 55 str.ReleaseBuffer(); 56 return str; 57 } 58 59 void CMyListCtrl::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) 60 { 61 CDC* pDC = CDC::FromHandle(lpDrawItemStruct->hDC); 62 CRect rcItem(lpDrawItemStruct->rcItem); 63 int nItem = lpDrawItemStruct->itemID; 64 COLORREF clrTextSave, clrBkSave; 65 static _TCHAR szBuff[50000];//这里是你要显示的字符串长度,想多长有多长 66 LV_ITEM lvi; 67 lvi.mask = LVIF_TEXT | LVIF_STATE;//LVIF_IMAGE | 68 lvi.iItem = nItem; 69 lvi.iSubItem = 0; 70 lvi.pszText = szBuff; 71 lvi.cchTextMax = sizeof(szBuff); 72 lvi.stateMask = 0xFFFF; 73 GetItem(&lvi); 74 75 BOOL bSelected = (lvi.state & LVIS_SELECTED); 76 CRect rcAllLabels; 77 GetItemRect(nItem, rcAllLabels, LVIR_BOUNDS); 78 if (bSelected) 79 { 80 clrTextSave = pDC->SetTextColor(::GetSysColor(COLOR_HIGHLIGHTTEXT)); 81 clrBkSave = pDC->SetBkColor(::GetSysColor(COLOR_HIGHLIGHT)); 82 pDC->FillRect(rcAllLabels, &CBrush(::GetSysColor(COLOR_HIGHLIGHT))); 83 } 84 GetItemRect(nItem, rcItem, LVIR_LABEL); 85 pDC->DrawText(szBuff, -1, rcItem, DT_LEFT | DT_SINGLELINE | DT_NOPREFIX | DT_NOCLIP | DT_VCENTER); 86 87 LV_COLUMN lvc; 88 lvc.mask = LVCF_FMT | LVCF_WIDTH; 89 for (int nColumn = 1; GetColumn(nColumn, &lvc); nColumn++) 90 { 91 rcItem.left = rcItem.right; 92 rcItem.right += lvc.cx; 93 94 int nRetLen = CListCtrl::GetItemText(nItem, nColumn, 95 szBuff, sizeof(szBuff)); 96 if (nRetLen == 0) 97 continue; 98 UINT nJustify = DT_LEFT; 99 switch (lvc.fmt & LVCFMT_JUSTIFYMASK) 100 { 101 case LVCFMT_RIGHT: 102 nJustify = DT_RIGHT; 103 break; 104 case LVCFMT_CENTER: 105 nJustify = DT_CENTER; 106 break; 107 default: 108 break; 109 }//单步执行时,szBuff里面长30000字节的字符串是正确的,但是执行完之后发现输出为空白 110 pDC->DrawText(szBuff, -1, rcItem, 111 nJustify | DT_SINGLELINE | DT_NOPREFIX | DT_NOCLIP | DT_VCENTER); 112 } 113 if (lvi.state & LVIS_FOCUSED) 114 pDC->DrawFocusRect(rcAllLabels); 115 if (bSelected) 116 { 117 pDC->SetTextColor(clrTextSave); 118 pDC->SetBkColor(clrBkSave); 119 } 120 }
VCCListCtrl显示长字符串自定义类
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