问：GetPrevSibling函数怎么用？谢谢你解释一下！

[leemuxiang]

[leemuxiang]

看样子分又给不出了，有谁知道吗？谢谢！

[蒋晟]

这个是你自己写的函数吧

[prog_st]

只找到GetPrevSiblingItem, 不知是否!

CTreeCtrl::GetPrevSiblingItem
HTREEITEM GetPrevSiblingItem( HTREEITEM hItem );

Return Value

The handle of the previous sibling; otherwise NULL.

Parameters

hItem

Handle of a tree item.

Remarks

Call this function to retrieve the previous sibling of hItem.

Example

// The pointer to my tree control.
extern CTreeCtrl* pmyTreeCtrl;
// The item whose previous siblings will be displayed in bold.
extern HTREEITEM hmyItem;

// Show all of the previous siblings of hmyItem in bold.
HTREEITEM hItem = hmyItem;

while (hItem != NULL)
{
pmyTreeCtrl->SetItemState(hItem, TVIS_BOLD, TVIS_BOLD);
hItem = pmyTreeCtrl->GetPrevSiblingItem(hItem);
}

[leemuxiang]

函数是Jeffrey Richter《高级windows编程》关于超市模拟中的一个函数，在MSDN中没有，代码如下，各位看看


void Dlg_OnHScroll(HWND hWnd,// 窗口句柄
HWND hWndCtl,// 控件句柄
UINT code,
int pos)
{

TCHAR szBuf[10];
int nPosCrnt,nPosMin,nPosMax;

// Get teh current position and legal range for the scroll bar that
// the user is changing.

nPosCrnt=ScrollBar_GetPos(hWndCtl);
ScrollBar_GetRange(hWndCtl,&nPosMin,&nPosMax);

switch(code)
{
case SB_LINELEFT:
nPosCrnt--;
break;
case SB_LINERIGHT:
nPosCrnt++;
break;
case SB_PAGELEFT:
nPosCrnt-=(nPosMax-nPosMin+1)/10;
break;
case SB_PAGERIGHT:
nPosCrnt+=(nPosMax-nPosMin+1)/10;
break;
case SB_THUMBTRACK:
nPosCrnt=pos;
break;
case SB_LEFT:
nPosCrnt=nPosMin;
break;
case SB_RIGHT:
nPosCrnt=nPosMax;
break;
}

// Make sure that the new scroll bar positon.
// is within the legal range.

if(nPosCrnt<nPosMin)
nPosCrnt=nPosMin;

if(nPosCrnt>nPosMax)
nPosCrnt=nPosMax;

ScrollBar_SetPos(hWndCtl,nPosCrnt,TRUE);

// Change the value displayed in the text box to
// reflect the value in the scroll bar.

_stprintf(szBuf,_TEXT("%d"),nPosCrnt);
SetWindowText(GetPrevSibling(hWndCtl),szBuf);

}

[leemuxiang]

最后一行！

[leemuxiang]

查了一下：
#define GetPrevSibling(hwnd) GetWindow(hwnd, GW_HWNDPREV)
头文件：windowsx.h
原来是一个宏，谢谢上面各位回复!