vc中怎么通过ADO(或ODBC)存取,修改MS SQL中的image类型列,请详细一些,最好能有例程,分不是问题。 可以先删除在添加,可以作为修改ADO中有AppendChunk()函数或者动态生成一个SQL语句 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 ADO的话,只有用GetChunk(),AppendChunk()来操作大字段数据。 // ADOBlobDlg.cpp : implementation file//#include "stdafx.h"#include "ADOBlob.h"#include "ADOBlobDlg.h"#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE[] = __FILE__;#endifextern CADOBlobApp theApp;/////////////////////////////////////////////////////////////////////////////// CAboutDlg dialog used for App Aboutclass CAboutDlg : public CDialog{public: CAboutDlg();// Dialog Data //{{AFX_DATA(CAboutDlg) enum { IDD = IDD_ABOUTBOX }; //}}AFX_DATA // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CAboutDlg) protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support //}}AFX_VIRTUAL// Implementationprotected: //{{AFX_MSG(CAboutDlg) //}}AFX_MSG DECLARE_MESSAGE_MAP()};CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD){ //{{AFX_DATA_INIT(CAboutDlg) //}}AFX_DATA_INIT}void CAboutDlg::DoDataExchange(CDataExchange* pDX){ CDialog::DoDataExchange(pDX); //{{AFX_DATA_MAP(CAboutDlg) //}}AFX_DATA_MAP}BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) //{{AFX_MSG_MAP(CAboutDlg) // No message handlers //}}AFX_MSG_MAPEND_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////// CADOBlobDlg dialogCADOBlobDlg::CADOBlobDlg(CWnd* pParent /*=NULL*/) : CDialog(CADOBlobDlg::IDD, pParent){ //{{AFX_DATA_INIT(CADOBlobDlg) m_UserName = _T(""); m_Old = _T(""); //}}AFX_DATA_INIT // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); m_bModify = FALSE; m_hPhotoBitmap = NULL; m_pBMPBuffer = NULL;}void CADOBlobDlg::DoDataExchange(CDataExchange* pDX){ CDialog::DoDataExchange(pDX); //{{AFX_DATA_MAP(CADOBlobDlg) DDX_Control(pDX, IDC_DELETEUSER, m_buttonDeleteUser); DDX_Control(pDX, IDC_PREVIOUSUSER, m_buttonPreviousUser); DDX_Control(pDX, IDC_NEXTUSER, m_buttonNextUser); DDX_Control(pDX, IDC_OLD, m_editOld); DDX_Control(pDX, IDC_USERNAME, m_editUserName); DDX_Control(pDX, IDC_SELECTPHOTO, m_buttonSelectPhoto); DDX_Control(pDX, IDC_SAVEINFO, m_buttonSaveInfo); DDX_Text(pDX, IDC_USERNAME, m_UserName); DDX_Text(pDX, IDC_OLD, m_Old); //}}AFX_DATA_MAP}BEGIN_MESSAGE_MAP(CADOBlobDlg, CDialog) //{{AFX_MSG_MAP(CADOBlobDlg) ON_WM_SYSCOMMAND() ON_WM_PAINT() ON_WM_QUERYDRAGICON() ON_BN_CLICKED(IDC_ADDUSER, OnAddUser) ON_EN_CHANGE(IDC_USERNAME, OnChangeUsername) ON_EN_CHANGE(IDC_OLD, OnChangeOld) ON_BN_CLICKED(IDC_SAVEINFO, OnSaveinfo) ON_BN_CLICKED(IDC_SELECTPHOTO, OnSelectphoto) ON_BN_CLICKED(IDC_NEXTUSER, OnNextUser) ON_BN_CLICKED(IDC_PREVIOUSUSER, OnPreviousUser) ON_BN_CLICKED(IDC_DELETEUSER, OnDeleteUser) //}}AFX_MSG_MAPEND_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////// CADOBlobDlg message handlersBOOL CADOBlobDlg::OnInitDialog(){ CDialog::OnInitDialog(); ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ASSERT(IDM_ABOUTBOX < 0xF000); CMenu* pSysMenu = GetSystemMenu(FALSE); if (pSysMenu != NULL) { CString strAboutMenu; strAboutMenu.LoadString(IDS_ABOUTBOX); if (!strAboutMenu.IsEmpty()) { pSysMenu->AppendMenu(MF_SEPARATOR); pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); } } SetIcon(m_hIcon, TRUE); // Set big icon SetIcon(m_hIcon, FALSE); // Set small icon m_bNewUser = FALSE; m_pRecordset.CreateInstance("ADODB.Recordset"); HRESULT hr = m_pRecordset->Open("SELECT * FROM userphoto",_variant_t((IDispatch *)theApp.m_pConnection,true),adOpenDynamic,adLockPessimistic,adCmdText); if(SUCCEEDED(hr)) { ReadData(); } ResetControls(); return TRUE; // return TRUE unless you set the focus to a control}/////////////////////读取记录集当前记录中数据,包括图像数据//////////////void CADOBlobDlg::ReadData(){ DestroyPhoto(); ///清除原图像 if(m_pRecordset->adoEOF||m_pRecordset->BOF) { m_UserName.Empty(); m_Old.Empty(); UpdateData(FALSE); return; } long lDataSize = m_pRecordset->GetFields()->GetItem("photo")->ActualSize; if(lDataSize > 0) { _variant_t varBLOB; varBLOB = m_pRecordset->GetFields()->GetItem("photo")->GetChunk(lDataSize); if(varBLOB.vt == (VT_ARRAY | VT_UI1)) { if(m_pBMPBuffer = new char[lDataSize+1]) ///重新分配必要的存储空间 { char *pBuf = NULL; SafeArrayAccessData(varBLOB.parray,(void **)&pBuf); memcpy(m_pBMPBuffer,pBuf,lDataSize); ///复制数据到缓冲区m_pBMPBuffer SafeArrayUnaccessData (varBLOB.parray); m_nFileLen = lDataSize; m_hPhotoBitmap = BufferToHBITMAP(); ///生成BITMAP对象 } } } m_UserName = m_pRecordset->GetCollect("username").bstrVal; m_Old.Format("%d",m_pRecordset->GetCollect("old").lVal); m_editUserName.EnableWindow(); m_editOld.EnableWindow(); m_buttonSelectPhoto.EnableWindow(); m_buttonDeleteUser.EnableWindow(); UpdateData(FALSE);}void CADOBlobDlg::OnSysCommand(UINT nID, LPARAM lParam){ if ((nID & 0xFFF0) == IDM_ABOUTBOX) { CAboutDlg dlgAbout; dlgAbout.DoModal(); } else { CDialog::OnSysCommand(nID, lParam); }}/////////////////在屏幕上显示图像///////////////////void CADOBlobDlg::DrawUserPhoto(int x, int y, CDC *pDC){ if(!m_hPhotoBitmap) return; HBITMAP OldBitmap; CDC MemDC; MemDC.CreateCompatibleDC(pDC); OldBitmap=(HBITMAP)MemDC.SelectObject(m_hPhotoBitmap); pDC->BitBlt(x,y,100,130,&MemDC,0,0,SRCCOPY); MemDC.SelectObject(OldBitmap);}void CADOBlobDlg::OnPaint() { CPaintDC dc(this); if (IsIconic()) { SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); // Center icon in client rectangle int cxIcon = GetSystemMetrics(SM_CXICON); int cyIcon = GetSystemMetrics(SM_CYICON); CRect rect; GetClientRect(&rect); int x = (rect.Width() - cxIcon + 1) / 2; int y = (rect.Height() - cyIcon + 1) / 2; // Draw the icon dc.DrawIcon(x, y, m_hIcon); } else { DrawUserPhoto(50,30,&dc); CDialog::OnPaint(); }}HCURSOR CADOBlobDlg::OnQueryDragIcon(){ return (HCURSOR) m_hIcon;}void CADOBlobDlg::OnAddUser() { if(m_bModify) { int nRet = MessageBox("当前用户信息尚未保存,是否保存?","VC知识库 WWW.VCKBASE.COM",MB_YESNOCANCEL); switch(nRet) { case IDCANCEL: return; case IDYES: OnSaveinfo(); break; case IDNO: default: break; } } m_editUserName.EnableWindow(); m_editOld.EnableWindow(); m_buttonSelectPhoto.EnableWindow(); m_buttonDeleteUser.EnableWindow(FALSE); m_Old = ""; m_UserName = ""; m_bModify = FALSE; m_bNewUser = TRUE; UpdateData(FALSE); DestroyPhoto(); Invalidate();}//////////////删除用户//////////////void CADOBlobDlg::OnDeleteUser() { m_pRecordset->Delete(adAffectCurrent); if(m_pRecordset->adoEOF) m_pRecordset->MoveLast(); ResetControls(); m_buttonDeleteUser.EnableWindow(FALSE); ReadData(); Invalidate();}void CADOBlobDlg::OnChangeUsername(){ m_bModify = TRUE; m_buttonSaveInfo.EnableWindow();}void CADOBlobDlg::OnChangeOld() { m_bModify = TRUE; m_buttonSaveInfo.EnableWindow();}////////////////保存用户信息/////////////////void CADOBlobDlg::OnSaveinfo() { if(!m_bModify) return; UpdateData(); if(m_pBMPBuffer == NULL || m_hPhotoBitmap == NULL || m_UserName == "" || m_Old == "") { AfxMessageBox("您没有提供完整的用户信息。\r\n这些信息包括:用户名、年龄、照片"); return; } m_buttonSaveInfo.EnableWindow(FALSE); char *pBuf = m_pBMPBuffer; VARIANT varBLOB; SAFEARRAY *psa; SAFEARRAYBOUND rgsabound[1]; if(m_bNewUser) m_pRecordset->AddNew(); m_pRecordset->PutCollect("username",_variant_t(m_UserName)); m_pRecordset->PutCollect("old",atol(m_Old)); if(pBuf) { rgsabound[0].lLbound = 0; rgsabound[0].cElements = m_nFileLen; psa = SafeArrayCreate(VT_UI1, 1, rgsabound); for (long i = 0; i < (long)m_nFileLen; i++) SafeArrayPutElement (psa, &i, pBuf++); varBLOB.vt = VT_ARRAY | VT_UI1; varBLOB.parray = psa; m_pRecordset->GetFields()->GetItem("photo")->AppendChunk(varBLOB); } m_pRecordset->Update(); m_buttonDeleteUser.EnableWindow(); ResetControls(); m_bNewUser = FALSE; m_bModify = FALSE;}///////////选择BMP文件并加载到内存/////////////void CADOBlobDlg::OnSelectphoto() { static char BASED_CODE szFilter[] = "BMP Files (*.bmp)|*.bmp|All Files (*.*)|*.*||"; CFileDialog dlg(TRUE,"BMP",NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,szFilter); if(dlg.DoModal() == IDOK) { CString pathname = dlg.GetPathName(); DestroyPhoto(); LoadBMPFile(pathname); m_hPhotoBitmap = BufferToHBITMAP(); m_bModify = TRUE; m_buttonSaveInfo.EnableWindow(); Invalidate(); }}/////////////清除分配的对象/////////////void CADOBlobDlg::DestroyPhoto(){ if(m_hPhotoBitmap) { DeleteObject(m_hPhotoBitmap); m_hPhotoBitmap = NULL; } if(m_pBMPBuffer) { delete m_pBMPBuffer; m_pBMPBuffer = NULL; }}/////////////加载BMP文件到内存//////////////BOOL CADOBlobDlg::LoadBMPFile(const char *pBMPPathname){ CFile file; if( !file.Open( pBMPPathname, CFile::modeRead) ) return FALSE; m_nFileLen = file.GetLength(); m_pBMPBuffer = new char[m_nFileLen + 1]; if(!m_pBMPBuffer) return FALSE; if(file.ReadHuge(m_pBMPBuffer,m_nFileLen) != m_nFileLen) return FALSE; return TRUE;}///////////将内存中的BMP文件内容转换到HBITMAP///////HBITMAP CADOBlobDlg::BufferToHBITMAP(){ HBITMAP hBmp; LPSTR hDIB,lpBuffer = m_pBMPBuffer; LPVOID lpDIBBits; BITMAPFILEHEADER bmfHeader; DWORD bmfHeaderLen; bmfHeaderLen = sizeof(bmfHeader); strncpy((LPSTR)&bmfHeader,(LPSTR)lpBuffer,bmfHeaderLen); if (bmfHeader.bfType != ((WORD) ('M' << 8) | 'B')) return NULL; hDIB = lpBuffer + bmfHeaderLen; BITMAPINFOHEADER &bmiHeader = *(LPBITMAPINFOHEADER)hDIB ; BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ; int nColors = bmiHeader.biClrUsed ? bmiHeader.biClrUsed : 1 << bmiHeader.biBitCount; if( bmInfo.bmiHeader.biBitCount > 8 ) lpDIBBits = (LPVOID)((LPDWORD)(bmInfo.bmiColors + bmInfo.bmiHeader.biClrUsed) + ((bmInfo.bmiHeader.biCompression == BI_BITFIELDS) ? 3 : 0)); else lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors); CClientDC dc(this); hBmp = CreateDIBitmap(dc.m_hDC,&bmiHeader,CBM_INIT,lpDIBBits,&bmInfo,DIB_RGB_COLORS); return hBmp;}BOOL CADOBlobDlg::DestroyWindow() { DestroyPhoto(); return CDialog::DestroyWindow();}//////////////下一个用户信息///////////////void CADOBlobDlg::OnNextUser() { if(m_bModify)///假如当前记录改动过,则保存 OnSaveinfo(); m_pRecordset->MoveNext(); if(m_pRecordset->adoEOF) m_pRecordset->MoveLast(); ReadData(); ResetControls(); Invalidate();}/////////////上一个用户信息/////////////////void CADOBlobDlg::OnPreviousUser() { if(m_bModify)///假如当前记录改动过,则保存 OnSaveinfo(); m_pRecordset->MovePrevious(); if(m_pRecordset->BOF) m_pRecordset->MoveFirst(); ReadData(); ResetControls(); Invalidate();}////////////////判断是否是最后一个记录//////////////BOOL CADOBlobDlg::LastRecord(){ if(m_pRecordset->adoEOF) { m_editUserName.EnableWindow(FALSE); m_editOld.EnableWindow(FALSE); m_buttonSelectPhoto.EnableWindow(FALSE); return TRUE; } m_pRecordset->MoveNext(); if(m_pRecordset->adoEOF) { m_pRecordset->MovePrevious(); return TRUE; } else { m_pRecordset->MovePrevious(); return FALSE; }}////////////////判断是否是第一个记录////////////////BOOL CADOBlobDlg::FirstRecord(){ if(m_pRecordset->BOF) { m_editUserName.EnableWindow(FALSE); m_editOld.EnableWindow(FALSE); m_buttonSelectPhoto.EnableWindow(FALSE); return TRUE; } m_pRecordset->MovePrevious(); if(m_pRecordset->BOF) { m_pRecordset->MoveFirst(); return TRUE; } else { m_pRecordset->MoveNext(); return FALSE; }}void CADOBlobDlg::ResetControls(){ BOOL IsFirstRecord = FirstRecord(); BOOL IsLastRecord = LastRecord(); m_buttonPreviousUser.EnableWindow(!IsFirstRecord); m_buttonNextUser.EnableWindow(!IsLastRecord);} 有没有办法通过消息唤醒键盘钩子线程 radio的group问题 小问题很急 GDI+ 下面没有类似 SetROP2 这样的选择绘图模式的函数吗? 用vc做算平均分的问题。请帮忙。急急,谢谢!!!! 关于接口、实现、与类的一个问题 如何实现阻止使用某个应用程序? 关于用户名的判断 如何学vc++? 做一个画图软件 一个mfc的小问题,多谢 在字符消息中想得到(想使用)ASCII码 怎么办?????
//#include "stdafx.h"
#include "ADOBlob.h"
#include "ADOBlobDlg.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endifextern CADOBlobApp theApp;
/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App Aboutclass CAboutDlg : public CDialog
{
public:
CAboutDlg();// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA // ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CADOBlobDlg dialogCADOBlobDlg::CADOBlobDlg(CWnd* pParent /*=NULL*/)
: CDialog(CADOBlobDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CADOBlobDlg)
m_UserName = _T("");
m_Old = _T("");
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
m_bModify = FALSE;
m_hPhotoBitmap = NULL;
m_pBMPBuffer = NULL;
}void CADOBlobDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CADOBlobDlg)
DDX_Control(pDX, IDC_DELETEUSER, m_buttonDeleteUser);
DDX_Control(pDX, IDC_PREVIOUSUSER, m_buttonPreviousUser);
DDX_Control(pDX, IDC_NEXTUSER, m_buttonNextUser);
DDX_Control(pDX, IDC_OLD, m_editOld);
DDX_Control(pDX, IDC_USERNAME, m_editUserName);
DDX_Control(pDX, IDC_SELECTPHOTO, m_buttonSelectPhoto);
DDX_Control(pDX, IDC_SAVEINFO, m_buttonSaveInfo);
DDX_Text(pDX, IDC_USERNAME, m_UserName);
DDX_Text(pDX, IDC_OLD, m_Old);
//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CADOBlobDlg, CDialog)
//{{AFX_MSG_MAP(CADOBlobDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_ADDUSER, OnAddUser)
ON_EN_CHANGE(IDC_USERNAME, OnChangeUsername)
ON_EN_CHANGE(IDC_OLD, OnChangeOld)
ON_BN_CLICKED(IDC_SAVEINFO, OnSaveinfo)
ON_BN_CLICKED(IDC_SELECTPHOTO, OnSelectphoto)
ON_BN_CLICKED(IDC_NEXTUSER, OnNextUser)
ON_BN_CLICKED(IDC_PREVIOUSUSER, OnPreviousUser)
ON_BN_CLICKED(IDC_DELETEUSER, OnDeleteUser)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CADOBlobDlg message handlersBOOL CADOBlobDlg::OnInitDialog()
{
CDialog::OnInitDialog(); ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000); CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
} SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon m_bNewUser = FALSE;
m_pRecordset.CreateInstance("ADODB.Recordset");
HRESULT hr = m_pRecordset->Open("SELECT * FROM userphoto",_variant_t((IDispatch *)theApp.m_pConnection,true),adOpenDynamic,adLockPessimistic,adCmdText);
if(SUCCEEDED(hr))
{
ReadData();
}
ResetControls();
return TRUE; // return TRUE unless you set the focus to a control
}/////////////////////读取记录集当前记录中数据,包括图像数据//////////////
void CADOBlobDlg::ReadData()
{
DestroyPhoto(); ///清除原图像
if(m_pRecordset->adoEOF||m_pRecordset->BOF)
{
m_UserName.Empty();
m_Old.Empty();
UpdateData(FALSE);
return;
}
long lDataSize = m_pRecordset->GetFields()->GetItem("photo")->ActualSize;
if(lDataSize > 0)
{
_variant_t varBLOB;
varBLOB = m_pRecordset->GetFields()->GetItem("photo")->GetChunk(lDataSize);
if(varBLOB.vt == (VT_ARRAY | VT_UI1))
{
if(m_pBMPBuffer = new char[lDataSize+1]) ///重新分配必要的存储空间
{
char *pBuf = NULL;
SafeArrayAccessData(varBLOB.parray,(void **)&pBuf);
memcpy(m_pBMPBuffer,pBuf,lDataSize); ///复制数据到缓冲区m_pBMPBuffer
SafeArrayUnaccessData (varBLOB.parray);
m_nFileLen = lDataSize;
m_hPhotoBitmap = BufferToHBITMAP(); ///生成BITMAP对象
}
}
}
m_UserName = m_pRecordset->GetCollect("username").bstrVal;
m_Old.Format("%d",m_pRecordset->GetCollect("old").lVal);
m_editUserName.EnableWindow();
m_editOld.EnableWindow();
m_buttonSelectPhoto.EnableWindow();
m_buttonDeleteUser.EnableWindow();
UpdateData(FALSE);
}void CADOBlobDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}/////////////////在屏幕上显示图像///////////////////
void CADOBlobDlg::DrawUserPhoto(int x, int y, CDC *pDC)
{
if(!m_hPhotoBitmap) return;
HBITMAP OldBitmap;
CDC MemDC;
MemDC.CreateCompatibleDC(pDC);
OldBitmap=(HBITMAP)MemDC.SelectObject(m_hPhotoBitmap);
pDC->BitBlt(x,y,100,130,&MemDC,0,0,SRCCOPY);
MemDC.SelectObject(OldBitmap);
}void CADOBlobDlg::OnPaint()
{
CPaintDC dc(this);
if (IsIconic())
{
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); // Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2; // Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
DrawUserPhoto(50,30,&dc);
CDialog::OnPaint();
}
}HCURSOR CADOBlobDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}void CADOBlobDlg::OnAddUser()
{
if(m_bModify)
{
int nRet = MessageBox("当前用户信息尚未保存,是否保存?","VC知识库 WWW.VCKBASE.COM",MB_YESNOCANCEL);
switch(nRet)
{
case IDCANCEL:
return;
case IDYES:
OnSaveinfo();
break;
case IDNO:
default:
break;
}
}
m_editUserName.EnableWindow();
m_editOld.EnableWindow();
m_buttonSelectPhoto.EnableWindow();
m_buttonDeleteUser.EnableWindow(FALSE);
m_Old = "";
m_UserName = "";
m_bModify = FALSE;
m_bNewUser = TRUE;
UpdateData(FALSE);
DestroyPhoto();
Invalidate();
}//////////////删除用户//////////////
void CADOBlobDlg::OnDeleteUser()
{
m_pRecordset->Delete(adAffectCurrent);
if(m_pRecordset->adoEOF)
m_pRecordset->MoveLast();
ResetControls();
m_buttonDeleteUser.EnableWindow(FALSE);
ReadData();
Invalidate();
}void CADOBlobDlg::OnChangeUsername()
{
m_bModify = TRUE;
m_buttonSaveInfo.EnableWindow();
}void CADOBlobDlg::OnChangeOld()
{
m_bModify = TRUE;
m_buttonSaveInfo.EnableWindow();
}////////////////保存用户信息/////////////////
void CADOBlobDlg::OnSaveinfo()
{
if(!m_bModify) return;
UpdateData();
if(m_pBMPBuffer == NULL || m_hPhotoBitmap == NULL || m_UserName == "" || m_Old == "")
{
AfxMessageBox("您没有提供完整的用户信息。\r\n这些信息包括:用户名、年龄、照片");
return;
}
m_buttonSaveInfo.EnableWindow(FALSE);
char *pBuf = m_pBMPBuffer;
VARIANT varBLOB;
SAFEARRAY *psa;
SAFEARRAYBOUND rgsabound[1]; if(m_bNewUser)
m_pRecordset->AddNew();
m_pRecordset->PutCollect("username",_variant_t(m_UserName));
m_pRecordset->PutCollect("old",atol(m_Old));
if(pBuf)
{
rgsabound[0].lLbound = 0;
rgsabound[0].cElements = m_nFileLen;
psa = SafeArrayCreate(VT_UI1, 1, rgsabound);
for (long i = 0; i < (long)m_nFileLen; i++)
SafeArrayPutElement (psa, &i, pBuf++);
varBLOB.vt = VT_ARRAY | VT_UI1;
varBLOB.parray = psa;
m_pRecordset->GetFields()->GetItem("photo")->AppendChunk(varBLOB);
}
m_pRecordset->Update();
m_buttonDeleteUser.EnableWindow();
ResetControls();
m_bNewUser = FALSE;
m_bModify = FALSE;
}///////////选择BMP文件并加载到内存/////////////
void CADOBlobDlg::OnSelectphoto()
{
static char BASED_CODE szFilter[] = "BMP Files (*.bmp)|*.bmp|All Files (*.*)|*.*||";
CFileDialog dlg(TRUE,"BMP",NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,szFilter);
if(dlg.DoModal() == IDOK)
{
CString pathname = dlg.GetPathName();
DestroyPhoto();
LoadBMPFile(pathname);
m_hPhotoBitmap = BufferToHBITMAP();
m_bModify = TRUE;
m_buttonSaveInfo.EnableWindow();
Invalidate();
}
}/////////////清除分配的对象/////////////
void CADOBlobDlg::DestroyPhoto()
{
if(m_hPhotoBitmap)
{
DeleteObject(m_hPhotoBitmap);
m_hPhotoBitmap = NULL;
}
if(m_pBMPBuffer)
{
delete m_pBMPBuffer;
m_pBMPBuffer = NULL;
}
}/////////////加载BMP文件到内存//////////////
BOOL CADOBlobDlg::LoadBMPFile(const char *pBMPPathname)
{
CFile file;
if( !file.Open( pBMPPathname, CFile::modeRead) )
return FALSE;
m_nFileLen = file.GetLength();
m_pBMPBuffer = new char[m_nFileLen + 1];
if(!m_pBMPBuffer)
return FALSE;
if(file.ReadHuge(m_pBMPBuffer,m_nFileLen) != m_nFileLen)
return FALSE;
return TRUE;
}///////////将内存中的BMP文件内容转换到HBITMAP///////
HBITMAP CADOBlobDlg::BufferToHBITMAP()
{
HBITMAP hBmp;
LPSTR hDIB,lpBuffer = m_pBMPBuffer;
LPVOID lpDIBBits;
BITMAPFILEHEADER bmfHeader;
DWORD bmfHeaderLen; bmfHeaderLen = sizeof(bmfHeader);
strncpy((LPSTR)&bmfHeader,(LPSTR)lpBuffer,bmfHeaderLen);
if (bmfHeader.bfType != ((WORD) ('M' << 8) | 'B')) return NULL;
hDIB = lpBuffer + bmfHeaderLen;
BITMAPINFOHEADER &bmiHeader = *(LPBITMAPINFOHEADER)hDIB ;
BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
int nColors = bmiHeader.biClrUsed ? bmiHeader.biClrUsed : 1 << bmiHeader.biBitCount;
if( bmInfo.bmiHeader.biBitCount > 8 )
lpDIBBits = (LPVOID)((LPDWORD)(bmInfo.bmiColors + bmInfo.bmiHeader.biClrUsed) +
((bmInfo.bmiHeader.biCompression == BI_BITFIELDS) ? 3 : 0));
else
lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
CClientDC dc(this);
hBmp = CreateDIBitmap(dc.m_hDC,&bmiHeader,CBM_INIT,lpDIBBits,&bmInfo,DIB_RGB_COLORS);
return hBmp;
}
BOOL CADOBlobDlg::DestroyWindow()
{
DestroyPhoto();
return CDialog::DestroyWindow();
}//////////////下一个用户信息///////////////
void CADOBlobDlg::OnNextUser()
{
if(m_bModify)///假如当前记录改动过,则保存
OnSaveinfo();
m_pRecordset->MoveNext();
if(m_pRecordset->adoEOF)
m_pRecordset->MoveLast();
ReadData();
ResetControls();
Invalidate();
}/////////////上一个用户信息/////////////////
void CADOBlobDlg::OnPreviousUser()
{
if(m_bModify)///假如当前记录改动过,则保存
OnSaveinfo();
m_pRecordset->MovePrevious();
if(m_pRecordset->BOF)
m_pRecordset->MoveFirst();
ReadData();
ResetControls();
Invalidate();
}////////////////判断是否是最后一个记录//////////////
BOOL CADOBlobDlg::LastRecord()
{
if(m_pRecordset->adoEOF)
{
m_editUserName.EnableWindow(FALSE);
m_editOld.EnableWindow(FALSE);
m_buttonSelectPhoto.EnableWindow(FALSE);
return TRUE;
}
m_pRecordset->MoveNext();
if(m_pRecordset->adoEOF)
{
m_pRecordset->MovePrevious();
return TRUE;
}
else
{
m_pRecordset->MovePrevious();
return FALSE;
}}////////////////判断是否是第一个记录////////////////
BOOL CADOBlobDlg::FirstRecord()
{
if(m_pRecordset->BOF)
{
m_editUserName.EnableWindow(FALSE);
m_editOld.EnableWindow(FALSE);
m_buttonSelectPhoto.EnableWindow(FALSE);
return TRUE;
}
m_pRecordset->MovePrevious();
if(m_pRecordset->BOF)
{
m_pRecordset->MoveFirst();
return TRUE;
}
else
{
m_pRecordset->MoveNext();
return FALSE;
}
}void CADOBlobDlg::ResetControls()
{
BOOL IsFirstRecord = FirstRecord();
BOOL IsLastRecord = LastRecord();
m_buttonPreviousUser.EnableWindow(!IsFirstRecord);
m_buttonNextUser.EnableWindow(!IsLastRecord);
}