BYTE []到CImage（C ++）

Question

我此刻正在挣扎，并希望有人可以帮助我。

我从SQL数据库中获取图像并将其存储到BYTE []。 现在我必须将其转换为CImage以在我的程序中显示它。

我很乐意为你提供帮助。

继承我的守则：

SQLLEN    cbData;
CImage    image;
BYTE  testByte[arrSize];

try
{
    m_Rc = ExecuteDirect(SQLStmt_Select, "SELECT ImgDat FROM ImgMap", "ImgTyp = 'AtlStm.AtlImg'", Empty_String, Empty_String, Empty_String, Empty_String);
    m_RcFetch = SQLFetch(m_Hstmt);      
    m_Rc = SQLGetData(m_Hstmt, 1, SQL_C_BINARY, &testByte, arrSize, &cbData);
}
// store testByte in image

在C＃中，我只是将Byte []写入MemoryStream并使用它来创建一个Image。但在C ++中我完全不知道。

我的C＃代码：

        DataTable dt = new DataTable();
        OdbcConnection cn = new OdbcConnection(strCn);
        cn.Open();

        OdbcDataAdapter adapter = new OdbcDataAdapter(sqlCommand, cn);

        DataSet ds = new DataSet();
        adapter.Fill(ds, "ImgMap");
        int c = ds.Tables["ImgMap"].Rows.Count;

        if (c > 0)
        {
            Byte[] byteBLOBData = new Byte[0];
            byteBLOBData = (Byte[])(ds.Tables["ImgMap"].Rows[c - 1]["ImgDat"]);
            MemoryStream stmBLOBData = new MemoryStream(byteBLOBData);
            pictureBox1.Image = Image.FromStream(stmBLOBData);
        }
        cn.Close();

修改 这是我当前的代码，它可以工作，但我的控制权仍然是空的。

BOOL DBStatement::GetSqlData_Image(CWnd* parent, CImage image, CStatic* dc)
{
SQLLEN    cbData;
BYTE  testByte[2048];

int width  = 312;
int height = 159;
void* bits;

try
{
    m_Rc = ExecuteDirect(SQLStmt_Select, "SELECT ImgDat FROM ImgMap", "ImgTyp = 'AtlStm.AtlImg'", Empty_String, Empty_String, Empty_String, Empty_String);
    m_RcFetch = SQLFetch(m_Hstmt);      
    m_Rc = SQLGetData(m_Hstmt, 1, SQL_C_BINARY, &testByte, 2048, &cbData);

    BITMAPFILEHEADER* bmfh;
    bmfh = (BITMAPFILEHEADER*)testByte;

    BITMAPINFOHEADER* bmih;
    bmih = (BITMAPINFOHEADER*)(testByte + sizeof(BITMAPFILEHEADER));
    BITMAPINFO* bmi;
    bmi = (BITMAPINFO*)bmih;

    bits = (void*)(testByte + bmfh->bfOffBits);


    CDC *screenDC = AfxGetMainWnd()->GetDC();
    CDC mDC;
    mDC.CreateCompatibleDC(screenDC);
    CBitmap b;
    b.CreateCompatibleBitmap(screenDC, 300, 150);

    CBitmap *pob = mDC.SelectObject(&b);
    mDC.SetStretchBltMode(HALFTONE);
    CRect rectDest(0, 0, width, height);
    image.StretchBlt(mDC.m_hDC, rectDest);
    mDC.SelectObject(pob);

    HBITMAP hbmp = CreateDIBitmap(mDC.m_hDC, bmih, CBM_INIT, bits, bmi, DIB_RGB_COLORS);
    b.Attach(hbmp);

    dc->SetBitmap((HBITMAP)b.Detach());
}