先帖一下代码吧:
CRect rt;
this->GetClientRect(&rt);
m_dcMemory.CreateCompatibleDC(pdc);
// 为屏幕DC创建兼容的内存DC
m_Bmp.CreateCompatibleBitmap(&m_dcMemory, rt.Width(), rt.Height()); // 相当于选择画布
::SelectObject(m_dcMemory.GetSafeHdc(), m_Bmp);
m_dcMemory.FillSolidRect(&rt, 0x00FFFFFF); CBitmap bitmap;
CString fileName =
"C:\\graphcom\\normal2.bmp";
bitmap.m_hObject = (HBITMAP)::LoadImage(NULL,
fileName,
IMAGE_BITMAP,
0 , 0,
LR_CREATEDIBSECTION | LR_LOADFROMFILE);
CDC *mdc = new CDC;
mdc->CreateCompatibleDC(pdc);
mdc->SelectObject(&bitmap);
#if 1
m_dcMemory.BitBlt(0,
0,
50,
50,mdc,0,0,SRCCOPY);
pdc->BitBlt(0, 0, rt.Width(), rt.Height(), &m_dcMemory, 0, 0, SRCCOPY);
this->ReleaseDC(pdc);
#else
pdc->BitBlt(20,
20,
200,
200,mdc,0,0,SRCCOPY);
this->ReleaseDC(pdc);
#endif
用if和else之间的代码编译就是黑框,用else之后的编译是正常的,请大侠们帮我看看吧,不胜感激。。
CRect rt;
this->GetClientRect(&rt);
m_dcMemory.CreateCompatibleDC(pdc);
// 为屏幕DC创建兼容的内存DC
m_Bmp.CreateCompatibleBitmap(&m_dcMemory, rt.Width(), rt.Height()); // 相当于选择画布
::SelectObject(m_dcMemory.GetSafeHdc(), m_Bmp);
m_dcMemory.FillSolidRect(&rt, 0x00FFFFFF); CBitmap bitmap;
CString fileName =
"C:\\graphcom\\normal2.bmp";
bitmap.m_hObject = (HBITMAP)::LoadImage(NULL,
fileName,
IMAGE_BITMAP,
0 , 0,
LR_CREATEDIBSECTION | LR_LOADFROMFILE);
CDC *mdc = new CDC;
mdc->CreateCompatibleDC(pdc);
mdc->SelectObject(&bitmap);
#if 1
m_dcMemory.BitBlt(0,
0,
50,
50,mdc,0,0,SRCCOPY);
pdc->BitBlt(0, 0, rt.Width(), rt.Height(), &m_dcMemory, 0, 0, SRCCOPY);
this->ReleaseDC(pdc);
#else
pdc->BitBlt(20,
20,
200,
200,mdc,0,0,SRCCOPY);
this->ReleaseDC(pdc);
#endif
用if和else之间的代码编译就是黑框,用else之后的编译是正常的,请大侠们帮我看看吧,不胜感激。。
解决方案 »
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2:直接画在设备上了。
1使用的方法不正确
我这里有个封装的类#ifndef __MEMDC_H__
#define __MEMDC_H__#pragma once#ifdef USEMOSKINNAMESPACE
namespace UMoSkin
{
#endifclass CMemDC : public CDC {
private:
CBitmap m_bitmap; // Offscreen bitmap
CBitmap* m_oldBitmap; // bitmap originally found in CMemDC
CDC* m_pDC; // Saves CDC passed in constructor
CRect m_rect; // Rectangle of drawing area.
BOOL m_bMemDC; // TRUE if CDC really is a Memory DC.
public:
CMemDC(CDC* pDC, const CRect* pRect = NULL) : CDC()
{
ASSERT(pDC != NULL); // Some initialization
m_pDC = pDC;
m_oldBitmap = NULL;
m_bMemDC = !pDC->IsPrinting(); // Get the rectangle to draw
if (pRect == NULL) {
pDC->GetClipBox(&m_rect);
} else {
m_rect = *pRect;
} if (m_bMemDC) {
// Create a Memory DC
CreateCompatibleDC(pDC);
pDC->LPtoDP(&m_rect); m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height());
m_oldBitmap = SelectObject(&m_bitmap); SetMapMode(pDC->GetMapMode()); SetWindowExt(pDC->GetWindowExt());
SetViewportExt(pDC->GetViewportExt()); pDC->DPtoLP(&m_rect);
SetWindowOrg(m_rect.left, m_rect.top);
} else {
// Make a copy of the relevent parts of the current DC for printing
m_bPrinting = pDC->m_bPrinting;
m_hDC = pDC->m_hDC;
m_hAttribDC = pDC->m_hAttribDC;
} // Fill background
FillSolidRect(m_rect, pDC->GetBkColor());
}
~CMemDC()
{
if (m_bMemDC) {
// Copy the offscreen bitmap onto the screen.
m_pDC->BitBlt(m_rect.left, m_rect.top, m_rect.Width(), m_rect.Height(),
this, m_rect.left, m_rect.top, SRCCOPY);
//Swap back the original bitmap.
SelectObject(m_oldBitmap);
} else {
// All we need to do is replace the DC with an illegal value,
// this keeps us from accidently deleting the handles associated with
// the CDC that was passed to the constructor.
m_hDC = m_hAttribDC = NULL;
}
}
// Allow usage as a pointer
CMemDC* operator->()
{
return this;
} // Allow usage as a pointer
operator CMemDC*()
{
return this;
}
};#ifdef USEMOSKINNAMESPACE
}
#endif#endif使用方法
CMemDC menmdc(dc,rect);
直接在menmdc绘制
pDC->LPtoDP(&m_rect);
m_Bmp.CreateCompatibleBitmap(pdc, rt.Width(), rt.Height());试试看呢?