摘要:这是CSDN的VC论坛上的一个老FAQ了。我在写自定义在RichEdit中插入对象的图标（http://www.blogcn.com/user3/jiangsheng/blog/1319738.html）这片文章的时候就是想用这个技术做动画GIF的，但是怎么判断一个内嵌在RichEdit的对象是GIF这个问题一直没有解决。好在QQ附带的一个控件支持动画GIF，可以插入这个对象来解决问题。
首先需要一个定时器来定时更新GIF。
public: System::Void OnLoad(System::Object^? sender, System::EventArgs^? e)?? {???this->typingRichTextBox->RichTextShortcutsEnabled=false;???this->timer1->Start();?? }
private: System::Void OnFormClosing(System::Object^? sender, System::Windows::Forms::FormClosingEventArgs^? e)?? {??? this->timer1->Stop();??? this->frameClosing=true;?? }
然后在定时器的处理函数里面通知GIF控件更新显示。
private: System::Void OnTimer1Elapsed(System::Object^? sender, System::Timers::ElapsedEventArgs^? e)?? {??? if(this->frameClosing==false)????UnmanagedGifTriggerFrameChange(this->contentRichTextBox->Handle.ToInt32());?? }
最后的工作就是插入GIF了
private: System::Void smileToolStripMenuItem_Click(System::Object^? sender, System::EventArgs^? e)?? {??? insertemotion(sender,e,"c:\\Program Files\\Tencent\\QQ\\Face\\20.gif");?? }
private: System::Void insertemotion(System::Object^? sender, System::EventArgs^? e,String ^ gifPath)?? {???System::Windows::Forms::RichTextBox^? ptypingRichTextBox=this->typingRichTextBox;???stdcli::language::pin_ptr< wchar_t> wch = PtrToStringChars(gifPath);???UnmanagedInsertGif(ptypingRichTextBox->Handle.ToInt32(),wch );?? }
为了偷懒起见关键的代码还是用Native C++来写，所以这些函数名全部以Unmanaged开头。
//unmanagedwin32.h//混合托管和非托管编程的话，编译的时候不能使用/clr:safe和/clr:pure开关，#pragma once#pragma unmanaged//用这个开关来切换托管和非托管代码extern?void UnmanagedScrollToButton(int hwndRichEdit);extern void UnmanagedInsertGif(int hwndRichEdit,wchar_t * pFilePath);extern void UnmanagedGifTriggerFrameChange(int hwndRichEdit);#pragma managed
//unmanagedwin32.cc
//使用了Windows 平台SDK//必须要使用clr:oldSyntax来避免SDK头文件和C++/CLI语法的冲突//而且在Visual C++ 2005 Express中要添加/d1PrivateNativeTypes 开关以避免混合LNK2022错误。#define?UNICODE#define?_UNICODE#define??_WIN32_DCOM#include "windows.h"#include "Richedit.h"#include "Richole.h"#pragma comment( lib, "User32.lib" )#include "UnmanagedWin32.h"//纯用C编写自动化操作会死人的，幸好可以自动导入#import "c:\\Program files\\tencent\\qq\\ImageOle.dll" named_guids//移动光标到末尾然后调用System::Windows::Forms::RichTextBox的ScrollToCaret方法，需要拖动滚动条才可以看到最后一行之前的文字。老办法，API伺候。void UnmanagedScrollToButton(int hwndRichEdit){?HWND h=(HWND)hwndRichEdit;?int line = SendMessage(h, EM_GETFIRSTVISIBLELINE, 0, 0);?int linecount = SendMessage(h, EM_GETLINECOUNT, 0, 0);?SendMessage(h, EM_LINESCROLL, 0, (linecount - line -......[
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