VC++加载图片(BMP)_汤臣倍健vc片图片资源-CSDN文库

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h：4个

cpp：3个

bmp：2个

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在VC++编程环境中，加载BMP（Bitmap）图片是一项常见的任务，特别是在开发图形用户界面（GUI）应用程序时。BMP是一种位图文件格式，通常用于存储图像数据。本篇文章将详细探讨如何在VC++中加载BMP图片，并结合描述中的“点击鼠标左键或鼠标移动到图形时，都会改变”这一功能进行讲解。我们需要了解Windows API中的GDI（Graphics Device Interface）函数，这是VC++中处理图形和图像的基本工具。GDI提供了许多函数，如`LoadImage`，`CreateDIBSection`，`CreateCompatibleDC`等，用于加载和显示BMP图片。 1. **使用LoadImage加载BMP**： `LoadImage`函数是Windows API中用于加载图像资源的通用函数，可以处理多种类型的图像文件，包括BMP。其基本用法如下： ```cpp HBITMAP hBitmap = (HBITMAP)LoadImage(NULL, L"image.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); ``` 这里的`NULL`表示从文件加载，`L"image.bmp"`是图片文件的路径，`IMAGE_BITMAP`指定我们要加载的是位图，`0, 0`是目标大小（保持原始尺寸），`LR_LOADFROMFILE`表示从文件加载。 2. **创建设备上下文（Device Context, DC）**：为了在屏幕上显示图像，我们需要创建一个与设备相关的上下文。使用`CreateCompatibleDC`函数创建一个与当前窗口兼容的DC。 ```cpp HDC hDC = GetDC(hWnd); // hWnd是窗口句柄 HDC hMemDC = CreateCompatibleDC(hDC); ``` 3. **选择位图到设备上下文**：使用`SelectObject`函数将加载的位图选入内存设备上下文。 ```cpp HBITMAP hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap); ``` 4. **绘制位图**：使用`BitBlt`函数将位图绘制到窗口的设备上下文中。 ```cpp BitBlt(hdc, 0, 0, bitmapWidth, bitmapHeight, hMemDC, 0, 0, SRCCOPY); ``` 5. **恢复和释放资源**：在完成绘制后，记得恢复原来的位图并释放资源。 ```cpp SelectObject(hMemDC, hOldBitmap); DeleteDC(hMemDC); ReleaseDC(hWnd, hDC); DeleteObject(hBitmap); ``` 接下来，我们将讨论描述中提到的交互功能，即鼠标事件处理。 6. **处理鼠标事件**：在VC++的MFC框架中，我们可以在CWnd类的派生类中重载`OnLButtonDown`、`OnMouseMove`等消息处理函数来响应鼠标操作。例如： - `OnLButtonDown`：当用户按下鼠标左键时触发。 - `OnMouseMove`：当鼠标移动时触发。在这些函数中，你可以根据鼠标的位置更新图像，比如改变图片的颜色、透明度，或者显示不同的图片。 ```cpp void CMyView::OnLButtonDown(UINT nFlags, CPoint point) { // 处理左键点击事件，例如更换图片 LoadNewBitmap(); // 自定义函数，加载新的BMP RedrawWindow(); } void CMyView::OnMouseMove(UINT nFlags, CPoint point) { // 处理鼠标移动事件，例如在鼠标下方显示提示信息或改变图片效果 ApplyMouseOverEffect(point); // 自定义函数，应用鼠标悬停效果 RedrawWindow(); } ``` 7. **自定义函数实现**：在`LoadNewBitmap`和`ApplyMouseOverEffect`中，你可以根据需求加载新的BMP图片，或者对当前图片应用特殊效果，比如改变颜色或透明度。 8. **重绘窗口**：为了显示更改，调用`RedrawWindow`函数使窗口重新绘制。总结，VC++加载BMP图片涉及Windows API的使用，包括加载位图、创建和管理设备上下文以及处理鼠标事件。通过结合这些技术，我们可以创建具有交互性的图形用户界面，实现如题目描述中的功能。在实际开发中，你可能还需要考虑性能优化、错误处理等其他因素，以确保程序的稳定性和用户体验。

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LoadPicture.rar （20个子文件）

LoadPicture

LoadPictureDlg.cpp 5KB

LoadPicture.dsw 545B

LoadPicture.clw 1KB

StdAfx.cpp 213B

LoadPicture.ncb 65KB

resource.h 825B

LoadPicture.dsp 4KB

LoadPicture.plg 1KB

LoadPicture.rc 5KB

LoadPicture.opt 55KB

LoadPictureDlg.h 2KB

ReadMe.txt 4KB

StdAfx.h 1KB

LoadPicture.aps 37KB

LoadPicture.cpp 2KB

res

LoadPicture.rc2 403B

LoadPicture.ico 1KB

chfz2.bmp 1KB

chfz3.bmp 1KB

LoadPicture.h 1KB

======================================================================== MICROSOFT FOUNDATION CLASS LIBRARY : LoadPicture ======================================================================== AppWizard has created this LoadPicture application for you. This application not only demonstrates the basics of using the Microsoft Foundation classes but is also a starting point for writing your application. This file contains a summary of what you will find in each of the files that make up your LoadPicture application. LoadPicture.dsp This file (the project file) contains information at the project level and is used to build a single project or subproject. Other users can share the project (.dsp) file, but they should export the makefiles locally. LoadPicture.h This is the main header file for the application. It includes other project specific headers (including Resource.h) and declares the CLoadPictureApp application class. LoadPicture.cpp This is the main application source file that contains the application class CLoadPictureApp. LoadPicture.rc This is a listing of all of the Microsoft Windows resources that the program uses. It includes the icons, bitmaps, and cursors that are stored in the RES subdirectory. This file can be directly edited in Microsoft Visual C++. LoadPicture.clw This file contains information used by ClassWizard to edit existing classes or add new classes. ClassWizard also uses this file to store information needed to create and edit message maps and dialog data maps and to create prototype member functions. res\LoadPicture.ico This is an icon file, which is used as the application's icon. This icon is included by the main resource file LoadPicture.rc. res\LoadPicture.rc2 This file contains resources that are not edited by Microsoft Visual C++. You should place all resources not editable by the resource editor in this file. ///////////////////////////////////////////////////////////////////////////// AppWizard creates one dialog class: LoadPictureDlg.h, LoadPictureDlg.cpp - the dialog These files contain your CLoadPictureDlg class. This class defines the behavior of your application's main dialog. The dialog's template is in LoadPicture.rc, which can be edited in Microsoft Visual C++. ///////////////////////////////////////////////////////////////////////////// Other standard files: StdAfx.h, StdAfx.cpp These files are used to build a precompiled header (PCH) file named LoadPicture.pch and a precompiled types file named StdAfx.obj. Resource.h This is the standard header file, which defines new resource IDs. Microsoft Visual C++ reads and updates this file. ///////////////////////////////////////////////////////////////////////////// Other notes: AppWizard uses "TODO:" to indicate parts of the source code you should add to or customize. If your application uses MFC in a shared DLL, and your application is in a language other than the operating system's current language, you will need to copy the corresponding localized resources MFC42XXX.DLL from the Microsoft Visual C++ CD-ROM onto the system or system32 directory, and rename it to be MFCLOC.DLL. ("XXX" stands for the language abbreviation. For example, MFC42DEU.DLL contains resources translated to German.) If you don't do this, some of the UI elements of your application will remain in the language of the operating system. /////////////////////////////////////////////////////////////////////////////

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