用PNG显示不规则窗口关键代码（网上搜集资料整理）方便查找

最新推荐文章于 2025-07-07 11:38:44 发布

原创最新推荐文章于 2025-07-07 11:38:44 发布 · 476 阅读

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文章标签：

#png #GDI+ #c++

本文介绍如何使用GDI+库在Windows应用程序中设置窗口背景为指定图片，并通过代码示例展示了从加载图片到将其渲染为窗口背景的具体步骤。

#include <gdiplus.h>
using namespace Gdiplus;
#pragma comment(lib,"gdiplus.lib")

下面的代码加在初始化位置：(MFC的OnInitDialog)

Image image(L"meinv.png");

DWORD dwStyle = GetWindowLong(m_hWnd, GWL_EXSTYLE);
SetWindowLong(m_hWnd, GWL_EXSTYLE, dwStyle | 0x80000);

HDC hDCDest = ::GetDC(m_hWnd);
m_hDCMem = CreateCompatibleDC(hDCDest);
HBITMAP hBmp=CreateCompatibleBitmap(hDCDest, image.GetWidth(), image.GetHeight());
SelectObject(m_hDCMem, hBmp);

RECT rect;
GetWindowRect(&rect);
POINT ptDest = { rect.left, rect.top };
POINT ptSrc = { 0, 0 };
SIZE sizeWindow = { image.GetWidth(), image.GetHeight() };

Graphics graphics(m_hDCMem);
graphics.DrawImage(&image, 0, 0, image.GetWidth(), image.GetHeight());
m_Blend.AlphaFormat = AC_SRC_ALPHA;
m_Blend.BlendFlags = 0;
m_Blend.BlendOp = AC_SRC_OVER;
m_Blend.SourceConstantAlpha = 255;

::UpdateLayeredWindow(m_hWnd, hDCDest, &ptDest, &sizeWindow, m_hDCMem, &ptSrc, 0, &m_Blend, 2);

效果