菜鸟之问!

[君忱]

IDC_EDIT控件值为m_kahao;
sql语句:
CString sql;
sql.Format("select * from renzl where 卡号='%s'",m_kahao);
为什么在控件里输入值,传不进去?

[eagerle01]

要先UpdateData();

[zteclx]

添加控件成员变量Vedit,
sql.Format("select * from renzl where 卡号='%s'",Vedit.text);

[Allen_zhang]

先理解CWnd::UpdateData
BOOL UpdateData( BOOL bSaveAndValidate = TRUE );

Return Value

Nonzero if the operation is successful; otherwise 0. If bSaveAndValidate is TRUE, then a return value of nonzero means that the data is successfully validated.

Parameters

bSaveAndValidate

Flag that indicates whether dialog box is being initialized (FALSE) or data is being retrieved (TRUE).
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在你调用下面的语句之前调用一下UpdateData(TRUE);
CString sql;
sql.Format("select * from renzl where 卡号='%s'",m_kahao);

[风云剑客]

GetDlgItem(IDC_EDIT)->GetWindowText(m_kahao);
CString sql;
sql.Format("select * from renzl where 卡号='%s'",m_kahao);
这样应该能行，而且对其他控件没有影响，以后修改也比较方便!