如何将jpeg图片存入ACCESS数据库，急，急！

Question

如何将jpeg图片存入ACCESS数据库，急，急！

Answer 1

#include <adoid.h>
#include <adoint.h>
#include <icrsint.h>
#include <atlbase.h>
ADOConnection* m_Conn;
ADORecordset* m_Rec;
//_RecordsetPtr m_Rec;
ADOFields* pFields;
///////设置ADO COM接口
const IID IID_IADOConnection = 
{0x00000550,0x0000,0x0010,{0x80,0x00,0x00,0xAA,0x00,0x6D,0x2E,0xA4}};
const CLSID CLSID_CADOConnection = 
{0x00000514,0x0000,0x0010,{0x80,0x00,0x00,0xAA,0x00,0x6D,0x2E,0xA4}};
const IID IID_IADORecordset = 
{0x00000556,0x0000,0x0010,{0x80,0x00,0x00,0xAA,0x00,0x6D,0x2E,0xA4}};
const CLSID CLSID_CADORecordset = 
{0x00000535,0x0000,0x0010,{0x80,0x00,0x00,0xAA,0x00,0x6D,0x2E,0xA4}};
void COleadoDlg::OnOK() 
{
// TODO: Add extra validation here
HRESULT   hr;
DWORD FileSize,count;
// LONG num;
char *pBuf;
VARIANT varBLOB;
SAFEARRAY *psa;
VARIANT rgvFields;
VARIANT rgvValues;
CFile f;
CFileException e;
HGLOBAL hfilemem; SAFEARRAYBOUND rgsabound[1];
hr=CoInitialize(NULL);
CString Constr,wCmdString,tempstr;
CComPtr<ADOField> pField;
if(FAILED(hr))
m_Conn = NULL;
m_Rec = NULL;
pFields = NULL;
if(!f.Open(m_PhotoPath,CFile::modeRead,&e))
{
AfxMessageBox("打开文件错误!");
return;
}
f.SeekToBegin();
FileSize=f.GetLength();
hfilemem=GlobalAlloc(GMEM_MOVEABLE,(FileSize));
if(!hfilemem)
{
::AfxMessageBox("内存不够!");
return;
}
pBuf=(char *)GlobalLock(hfilemem);
count=f.Read(pBuf,FileSize);
if(count!=FileSize)
{
::AfxMessageBox("数据错误");
f.Close(); 
return;
}
f.Close();
hr = ::CoCreateInstance((REFCLSID)CLSID_CADOConnection,NULL,CLSCTX_INPROC_SERVER,\
(REFIID)IID_IADOConnection,(LPVOID*)&m_Conn);
if (FAILED(hr))
return ;
hr = ::CoCreateInstance((REFCLSID)CLSID_CADORecordset,NULL,CLSCTX_INPROC_SERVER,\
(REFIID)IID_IADORecordset,(LPVOID*)&m_Rec);
if (FAILED(hr))
return ;
tempstr="E:\\练习\\MyApp\\数据库\\oleado\\oleado.mdb";
Constr="Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+tempstr+";Persist Security Info=False";
hr = m_Conn->Open(CComBSTR(Constr),CComBSTR(""),CComBSTR(""),adOpenUnspecified);
if (FAILED(hr))
{
::AfxMessageBox("连接数据库错误！");
return ;
}
wCmdString=_T("select * from userphoto");//
hr = m_Rec->Open(CComVariant(wCmdString),CComVariant(m_Conn),adOpenKeyset,adLockOptimistic,adCmdText);
if (FAILED(hr))
{
::AfxMessageBox("打开表错误！");
return ;
}/*     添加新的记录 需要两个参数 所以添加两个空的参数*/
rgvFields.vt = VT_ERROR;
rgvFields.scode = DISP_E_PARAMNOTFOUND;
rgvValues.vt = VT_ERROR;
rgvValues.scode = DISP_E_PARAMNOTFOUND;
UpdateData(); 
m_Rec->AddNew(rgvFields, rgvValues);
m_Rec->put_Collect(CComVariant(1),(CComVariant)(m_UserName));
m_Rec->put_Collect(CComVariant(2),CComVariant((long)m_UseOld));             ///为新记录填充username字段
pField=NULL;
if(pBuf)
{    
rgsabound[0].lLbound = 0;
rgsabound[0].cElements = FileSize;
psa = SafeArrayCreate(VT_UI1, 1, rgsabound);                      ///创建SAFEARRAY对象
for (long i = 0; i < (long)FileSize; i++)
SafeArrayPutElement (psa, &i, pBuf++);                         ///将pBuf指向的二进制数据保存到SAFEARRAY对象psa中
varBLOB.vt = VT_ARRAY | VT_UI1;                                   ///将varBLOB的类型设置为BYTE类型的数组
varBLOB.parray = psa;                                             ///为varBLOB变量赋值
m_Rec->get_Fields(&pFields);//加入BLOB类型的数据
pFields->get_Item(CComVariant(3),&pField);
pField->AppendChunk(varBLOB);///加入BLOB类型的数据
} 
hr=m_Rec->Update(rgvFields, rgvValues);  
if(FAILED(hr))
{
::AfxMessageBox("保存失败!");
return ;
}
// m_Rec->UpdateBatch(adAffectAll);
GlobalUnlock(hfilemem);
GlobalFree(hfilemem);
if(m_Rec)
{
m_Rec->Release();
}
if(m_Conn)
{
m_Conn->Close();
m_Conn->Release();
}
::AfxMessageBox("个人资料保存成功"); 
m_PhotoPath.Empty();
m_UseOld=0;
m_UserName.Empty();
SetDlgItemText(IDC_USERNAME, (LPCTSTR)" "); //在编辑框1中显示文件名
SetDlgItemInt(IDC_USEROLD,0);
// UpdateData(TRUE); 
// CDialog::OnOK();
}