将8位bmp位图的灰度直方图代码改为24位的之后出现异常错误，检查之后没有发现溢出越界之类的错误，请大家帮忙看看，这是部分代码：
#include "stdafx.h"
#include "sw.h"
#include "dlgIntensity.h"
#include "DIBAPI.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CdlgIntensity dialog
CdlgIntensity::CdlgIntensity(CWnd* pParent /*=NULL*/)
: CDialog(CdlgIntensity::IDD, pParent)
{
//{{AFX_DATA_INIT(CdlgIntensity)
m_iLowGray = 0;
m_iUpGray = 0;
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
}
void CdlgIntensity::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CdlgIntensity)
DDX_Text(pDX, IDC_EDIT_LowGray, m_iLowGray);
DDV_MinMaxInt(pDX, m_iLowGray, 0, 16777216);
DDX_Text(pDX, IDC_EDIT_UpGray, m_iUpGray);
DDV_MinMaxInt(pDX, m_iUpGray, 0, 16777216);
// NOTE: the ClassWizard will add DDX and DDV calls here
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CdlgIntensity, CDialog)
//{{AFX_MSG_MAP(CdlgIntensity)
ON_WM_PAINT()
ON_EN_KILLFOCUS(IDC_EDIT_LowGray, OnKillfocusEDITLowGray)
ON_EN_KILLFOCUS(IDC_EDIT_UpGray, OnKillfocusEDITUpGray)
ON_WM_MOUSEMOVE()
ON_WM_LBUTTONDOWN()
ON_WM_LBUTTONUP()
// NOTE: the ClassWizard will add message map macros here
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CdlgIntensity message handlers
BOOL CdlgIntensity::OnInitDialog()
{
// 指向源图像象素的指针
unsigned char * lpSrc;
// 循环变量
LONG i;
LONG j;
// 调用默认OnInitDialog函数
CDialog::OnInitDialog();
// 获取绘制直方图的标签
CWnd* pWnd = GetDlgItem(IDC_COORD);
// 计算接受鼠标事件的有效区域
pWnd->GetClientRect(m_MouseRect);
pWnd->ClientToScreen(&m_MouseRect);
CRect rect;
GetClientRect(rect);
ClientToScreen(&rect);
m_MouseRect.top -= rect.top;
m_MouseRect.left -= rect.left;
// 设置接受鼠标事件的有效区域
m_MouseRect.top += 25;
m_MouseRect.left += 10;
m_MouseRect.bottom = m_MouseRect.top + 16777215;
m_MouseRect.right = m_MouseRect.left + 16777216;
// 重置计数为0
for (i = 0; i < 16777216; i ++)
{
// 清零
m_lCount[i] = 0;
}
// 图像每行的字节数
LONG lLineBytes;
// 计算图像每行的字节数
lLineBytes = WIDTHBYTES(m_lWidth * 8);
// 计算各个灰度值的计数
for (i = 0; i < m_lHeight; i ++)
{
for (j = 0; j < m_lWidth; j ++)
{
lpSrc = (unsigned char *)m_lpDIBBits + lLineBytes * i + j;
// 计数加1
m_lCount[*(lpSrc)]++;
}
}
// 初始化拖动状态
m_iIsDraging = 0;
// 返回TRUE
return TRUE;
}
void CdlgIntensity::OnKillfocusEDITLowGray()
{
// 保存变动（控件中数值保存到成员变量中）
UpdateData(TRUE);
// 判断是否下限超过上限
if (m_iLowGray > m_iUpGray)
{
// 互换
int iTemp = m_iLowGray;
m_iLowGray = m_iUpGray;
m_iUpGray = iTemp;
// 更新（成员变量中数值保存到控件中）
UpdateData(FALSE);
}
// 重绘直方图
InvalidateRect(m_MouseRect, TRUE);
}
void CdlgIntensity::OnKillfocusEDITUpGray()
{
// 保存变动
UpdateData(TRUE);
// 判断是否下限超过上限
if (m_iLowGray > m_iUpGray)
{
// 互换
int iTemp = m_iLowGray;
m_iLowGray = m_iUpGray;
m_iUpGray = iTemp;
// 更新
UpdateData(FALSE);
}
// 重绘直方图
InvalidateRect(m_MouseRect, TRUE);
}
void CdlgIntensity::OnLButtonDown(UINT nFlags, CPoint point)
{
// 当用户单击鼠标左键开始拖动
// 判断是否在接受鼠标事件的有效区域中
if(m_MouseRect.PtInRect(point))
{
if (point.x == (m_MouseRect.left + m_iLowGray))
{
// 设置拖动状态1，拖动下限
m_iIsDraging = 1;
// 更改光标
::SetCursor(::LoadCursor(NULL, IDC_SIZEWE));
}
else if (point.x == (m_MouseRect.left + m_iUpGray))
{
// 设置拖动状态为2，拖动上限
m_iIsDraging = 2;
// 更改光标
::SetCursor(::LoadCursor(NULL, IDC_SIZEWE));
}
}
// 默认单击鼠标左键处理事件
CDialog::OnLButtonDown(nFlags, point);
}
void CdlgIntensity::OnMouseMove(UINT nFlags, CPoint point)
{
// 判断是否在接受鼠标事件的有效区域中
if(m_MouseRect.PtInRect(point))
{
// 判断是否正在拖动
if (m_iIsDraging != 0)
{
// 判断正在拖动上限还是下限
if (m_iIsDraging == 1)
{
// 判断是否下限<上限
if (point.x - m_MouseRect.left < m_iUpGray)
{
// 更改下限
m_iLowGray = point.x - m_MouseRect.left;
}
else
{
// 下限拖过上限，设置为上限-1
m_iLowGray = m_iUpGray - 1;
// 重设鼠标位置
point.x = m_MouseRect.left + m_iUpGray - 1;
}
}
else
{
// 正在拖动上限
// 判断是否上限>下限
if (point.x - m_MouseRect.left > m_iLowGray)
{
// 更改下限
m_iUpGray = point.x - m_MouseRect.left;
}
else
{
// 下限拖过上限，设置为下限＋1
m_iUpGray = m_iLowGray + 1;
// 重设鼠标位置
point.x = m_MouseRect.left + m_iLowGray + 1;
}
}
// 更改光标
::SetCursor(::LoadCursor(NULL, IDC_SIZEWE));
// 更新
UpdateData(FALSE);
// 重绘直方图
InvalidateRect(m_MouseRect, TRUE);
}
else if (point.x == (m_MouseRect.left + m_iLowGray) || point.x == (m_MouseRect.left + m_iUpGray))
{
// 更改光标
::SetCursor(::LoadCursor(NULL, IDC_SIZEWE));
}
}
// 默认鼠标移动处理事件
CDialog::OnMouseMove(nFlags, point);
}
void CdlgIntensity::OnLButtonUp(UINT nFlags, CPoint point)
{
// 当用户释放鼠标左键停止拖动
if (m_iIsDraging != 0)
{
// 重置拖动状态
m_iIsDraging = 0;
}
// 默认释放鼠标左键处理事件
CDialog::OnLButtonUp(nFlags, point);
}
void CdlgIntensity::OnPaint()
{
// 字符串
CString str;
// 循环变量
LONG i;
// 最大计数
LONG lMaxCount = 0;
// 设备上下文
CPaintDC dc(this);
// 获取绘制坐标的文本框
CWnd* pWnd = GetDlgItem(IDC_COORD);
// 指针
CDC* pDC = pWnd->GetDC();
pWnd->Invalidate();
pWnd->UpdateWindow();
pDC->Rectangle(0,0,330,300);
// 创建画笔对象
CPen* pPenRed = new CPen;
// 红色画笔
pPenRed->CreatePen(PS_SOLID,1,RGB(16777215,0,0));
// 创建画笔对象
CPen* pPenBlue = new CPen;
// 蓝色画笔
pPenBlue->CreatePen(PS_SOLID,1,RGB(0,0, 16777215));
// 创建画笔对象
CPen* pPenGreen = new CPen;
// 绿色画笔
pPenGreen->CreatePen(PS_DOT,1,RGB(0,16777215,0));
// 选中当前红色画笔，并保存以前的画笔
CGdiObject* pOldPen = pDC->SelectObject(pPenRed);
// 绘制坐标轴
pDC->MoveTo(10,10);
// 垂直轴
pDC->LineTo(10,280);
// 水平轴
pDC->LineTo(320,280);
// 写X轴刻度值
str.Format("0");
pDC->TextOut(10, 283, str);
str.Format("50");
pDC->TextOut(60, 283, str);
str.Format("100");
pDC->TextOut(110, 283, str);
str.Format("150");
pDC->TextOut(160, 283, str);
str.Format("200");
pDC->TextOut(210, 283, str);
str.Format("255");
pDC->TextOut(265, 283, str);
// 绘制X轴刻度
for (i = 0; i < 16777216; i += 5)
{
if ((i & 1) == 0)
{
// 10的倍数
pDC->MoveTo(i + 10, 280);
pDC->LineTo(i + 10, 284);
}
else
{
// 10的倍数
pDC->MoveTo(i + 10, 280);
pDC->LineTo(i + 10, 282);
}
}
// 绘制X轴箭头
pDC->MoveTo(315,275);
pDC->LineTo(320,280);
pDC->LineTo(315,285);
// 绘制X轴箭头
pDC->MoveTo(10,10);
pDC->LineTo(5,15);
pDC->MoveTo(10,10);
pDC->LineTo(15,15);
// 计算最大计数值
for (i = m_iLowGray; i <= m_iUpGray; i ++)
{
// 判断是否大于当前最大值
if (m_lCount[i] > lMaxCount)
{
// 更新最大值
lMaxCount = m_lCount[i];
}
}
// 输出最大计数值
pDC->MoveTo(10, 25);
pDC->LineTo(14, 25);
str.Format("%d", lMaxCount);
pDC->TextOut(11, 26, str);
// 更改成绿色画笔
pDC->SelectObject(pPenGreen);
// 绘制窗口上下限
pDC->MoveTo(m_iLowGray + 10, 25);
pDC->LineTo(m_iLowGray + 10, 280);
pDC->MoveTo(m_iUpGray + 10, 25);
pDC->LineTo(m_iUpGray + 10, 280);
// 更改成蓝色画笔
pDC->SelectObject(pPenBlue);
// 判断是否有计数
if (lMaxCount > 0)
{
// 绘制直方图
for (i = m_iLowGray; i <= m_iUpGray; i ++)
{
pDC->MoveTo(i + 10, 280);
pDC->LineTo(i + 10, 281 - (int) (m_lCount[i] * 16777216 / lMaxCount));
}
}
// 恢复以前的画笔
pDC->SelectObject(pOldPen);
// 删除新的画笔
delete pPenRed;
delete pPenBlue;
delete pPenGreen;
}
void CdlgIntensity::OnOK()
{
// 判断是否下限超过上限
if (m_iLowGray > m_iUpGray)
{
// 互换
int iTemp = m_iLowGray;
m_iLowGray = m_iUpGray;
m_iUpGray = iTemp;
}
// 返回
CDialog::OnOK();
}
