宏定义中的#和##的含义：

#include <Windows.h>
#include <tchar.h>
#include <iostream>
#define Test(x,y) x##y //自动连接 xy
#define T2(x) #x //自动转为字符串 "x"

int main()
{auto p = Test(Message, Box);(*p)(NULL, _T(T2(Hello aaa)), _T("温馨提示"), 0);puts(T2(hehehe hahaha));return 0;
}

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因为这边用24色位图 尺寸过大不符合所以返回了NULL

if((lpBitmap== NULL)||(lpBitmap->biBitCount>8))//要不就是你加载的图片为空 要不图像尺寸大于256色了

if (!m_toolBox.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP| CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||!m_toolBox.LoadToolBar(IDR_TOOLBOX)){TRACE0("未能创建工具栏\n");return -1;      // 未能创建}LPBITMAPINFOHEADER lpBitmap = (LPBITMAPINFOHEADER)LockResource(hglb);if ((lpBitmap == NULL) || (lpBitmap->biBitCount > 8)){return NULL;}

例如：

	afx_msg void OnDrawTools(UINT);/*afx_msg void OnDrawEllipse();afx_msg void OnDrawLine();afx_msg void OnDrawPencil();afx_msg void OnDrawPolygon();afx_msg void OnDrawRect();afx_msg void OnDrawRrect(); */

	afx_msg void OnUpdateDrawTools(CCmdUI* pCmdUI);/*afx_msg void OnUpdateDrawDrag(CCmdUI* pCmdUI);afx_msg void OnUpdateDrawEllipse(CCmdUI* pCmdUI);afx_msg void OnUpdateDrawLine(CCmdUI* pCmdUI);afx_msg void OnUpdateDrawPencil(CCmdUI* pCmdUI);afx_msg void OnUpdateDrawPolygon(CCmdUI* pCmdUI);afx_msg void OnUpdateDrawRect(CCmdUI* pCmdUI);afx_msg void OnUpdateDrawRrect(CCmdUI* pCmdUI);*/

//void CMainView::OnDrawDrag(){
//	m_nIndex = ID_DRAW_DRAG;
//}
//void CMainView::OnDrawEllipse(){
//	m_nIndex = ID_DRAW_ELLIPSE;
//}
//void CMainView::OnDrawLine(){
//	m_nIndex = ID_DRAW_LINE;
//}
//void CMainView::OnDrawPencil(){
//	m_nIndex = ID_DRAW_PENCIL;
//}
//void CMainView::OnDrawPolygon(){
//	m_nIndex = ID_DRAW_POLYGON;
//}

//void CMainView::OnDrawRect()
//{
//	m_nIndex = ID_DRAW_RECT;
//}
//void CMainView::OnDrawRrect()
//{
//	m_nIndex = ID_DRAW_RRECT;
//}	
//void CMainView::OnUpdateDrawDrag(CCmdUI* pCmdUI)
//{
//	//pCmdUI->SetCheck(m_nIndex == ID_DRAW_DRAG);
//	pCmdUI->SetCheck(m_nIndex == pCmdUI->m_nID);
//}

//void CMainView::OnUpdateDrawEllipse(CCmdUI* pCmdUI)
//{
//	pCmdUI->SetCheck(m_nIndex == pCmdUI->m_nID);
//}
//void CMainView::OnUpdateDrawLine(CCmdUI* pCmdUI)
//{
//	pCmdUI->SetCheck(m_nIndex == pCmdUI->m_nID);
//}
//void CMainView::OnUpdateDrawPencil(CCmdUI* pCmdUI)
//{
//	pCmdUI->SetCheck(m_nIndex == pCmdUI->m_nID);
//}

//void CMainView::OnUpdateDrawPolygon(CCmdUI* pCmdUI)
//{
//	pCmdUI->SetCheck(m_nIndex == pCmdUI->m_nID);
//}
//void CMainView::OnUpdateDrawRect(CCmdUI* pCmdUI)
//{
//	pCmdUI->SetCheck(m_nIndex == pCmdUI->m_nID);
//}
//void CMainView::OnUpdateDrawRrect(CCmdUI* pCmdUI)
//{
//	pCmdUI->SetCheck(m_nIndex == pCmdUI->m_nID);
//}

 void CMainView::OnDrawTools(UINT nID)
{m_nIndex = nID;
}void CMainView::OnUpdateDrawTools(CCmdUI* pCmdUI){//pCmdUI->SetCheck(); //这个TRUE的话7个都会亮起来pCmdUI->SetCheck(pCmdUI->m_nID == m_nIndex);}

区间命令管理，把7套命令和状态管理函数合并成1套

#define ON_COMMAND(id, memberFxn) \  一消息一函数
{WM_COMMAND,CN_COMMAND,(WORD)id,(WORD)id,AfxSigCmd_v,static_cast<AFX_PMSG> (memberFxn)},// ON_COMMAND(id, OnBar) is the same as// ON_CONTROL(0, id, OnBar) or ON_BN_CLICKED(0, id, OnBar)

#define ON_COMMAND_RANGE(id, idLast, memberFxn) \  
一消息的范围 参数为 起始消息 到最终消息  都来搞memberFxn) 这个函数{ WM_COMMAND, CN_COMMAND, (WORD)id, (WORD)idLast, AfxSigCmd_RANGE, \(AFX_PMSG) \(static_cast< void (AFX_MSG_CALL CCmdTarget::*)(UINT) > \(memberFxn)) },// ON_COMMAND_RANGE(id, idLast, OnBar) is the same as// ON_CONTROL_RANGE(0, id, idLast, OnBar)

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gdi+无效

有可能是没有进行初始化

#include <gdiplus.h> 对应头文件 
using namespace Gdiplus;命名空间GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

确保句柄有效

if (pDC->GetSafeHdc() == NULL) {// 绘图上下文无效，无法绘制return;
}
Graphics g(pDC->GetSafeHdc());