昏倒……要注意对应关系! 系统的Combo控件的那个属性本来就是DWORD,VB只不过把它映射成了属性 CB_SETITEMDATA An application sends a CB_SETITEMDATA message to set the 32-bit value associated with the specified item in a combo box. CB_SETITEMDATA wParam = (WPARAM) index; // item index lParam = (LPARAM) (DWORD) dwData; // item data
Parameters index Value of wParam. Specifies the item's zero-based index. dwData Value of lParam. Specifies the new value to be associated with the item. Return Values If an error occurs, the return value is CB_ERR. Res If the specified item is in an owner-drawn combo box created without the CBS_HASSTRINGS style, this message replaces the 32-bit value in the lParam parameter of the CB_ADDSTRING or CB_INSERTSTRING message that added the item to the combo box. QuickInfo Windows NT: Requires version 3.1 or later. Windows: Requires Windows 95 or later. Windows CE: Requires version 1.0 or later. Header: Declared in winuser.h. CB_GETITEMDATA An application sends a CB_GETITEMDATA message to a combo box to retrieve the application-supplied 32-bit value associated with the specified item in the combo box. CB_GETITEMDATA wParam = (WPARAM) index; // item index lParam = 0; // not used; must be zero
Parameters index Value of wParam. Specifies the zero-based index of the item. Return Values The return value is the 32-bit value associated with the item. If an error occurs, it is CB_ERR. If the item is in an owner-drawn combo box created without the CBS_HASSTRINGS style, the return value is the 32-bit value contained in the lParam parameter of the CB_ADDSTRING or CB_INSERTSTRING message that added the item to the combo box. If the CBS_HASSTRINGS style was not used, the return value is the lParam parameter contained in a CB_SETITEMDATA message.
有没有更好的?
系统的Combo控件的那个属性本来就是DWORD,VB只不过把它映射成了属性
CB_SETITEMDATA
An application sends a CB_SETITEMDATA message to set the 32-bit value associated with the specified item in a combo box. CB_SETITEMDATA
wParam = (WPARAM) index; // item index
lParam = (LPARAM) (DWORD) dwData; // item data
Parameters
index
Value of wParam. Specifies the item's zero-based index.
dwData
Value of lParam. Specifies the new value to be associated with the item.
Return Values
If an error occurs, the return value is CB_ERR. Res
If the specified item is in an owner-drawn combo box created without the CBS_HASSTRINGS style, this message replaces the 32-bit value in the lParam parameter of the CB_ADDSTRING or CB_INSERTSTRING message that added the item to the combo box. QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winuser.h.
CB_GETITEMDATA
An application sends a CB_GETITEMDATA message to a combo box to retrieve the application-supplied 32-bit value associated with the specified item in the combo box. CB_GETITEMDATA
wParam = (WPARAM) index; // item index
lParam = 0; // not used; must be zero
Parameters
index
Value of wParam. Specifies the zero-based index of the item.
Return Values
The return value is the 32-bit value associated with the item. If an error occurs, it is CB_ERR. If the item is in an owner-drawn combo box created without the CBS_HASSTRINGS style, the return value is the 32-bit value contained in the lParam parameter of the CB_ADDSTRING or CB_INSERTSTRING message that added the item to the combo box. If the CBS_HASSTRINGS style was not used, the return value is the lParam parameter contained in a CB_SETITEMDATA message.