官方源码

#import "WxMsgPreview.h"

%hook CMessageMgr

-(void)AsyncOnAddMsg:(id)message MsgWrap:(CMessageWrap* )msgWrap {
    %log;
    %orig;
    if(msgWrap.m_uiMessageType == 49){
        CContactMgr *contactManager = [[%c(MMServiceCenter) defaultCenter] getService:[%c(CContactMgr) class]];
        CContact *selfContact = [contactManager getSelfContact];

        if ([msgWrap.m_nsContent rangeOfString:@"wxpay://c2cbizmessagehandler/hongbao/receivehongbao"].location != NSNotFound) { // 红包

            NSString *nativeUrl = [[msgWrap m_oWCPayInfoItem] m_c2cNativeUrl];
            nativeUrl = [nativeUrl substringFromIndex:[@"wxpay://c2cbizmessagehandler/hongbao/receivehongbao?" length]];

            NSDictionary *nativeUrlDict = [%c(WCBizUtil) dictionaryWithDecodedComponets:nativeUrl separator:@"&"];

            NSMutableDictionary *args = [[%c(NSMutableDictionary) alloc] init];
            [args setObject:nativeUrlDict[@"msgtype"] forKey:@"msgType"];
            [args setObject:nativeUrlDict[@"sendid"] forKey:@"sendId"];
            [args setObject:nativeUrlDict[@"channelid"] forKey:@"channelId"];
            [args setObject:[selfContact getContactDisplayName] forKey:@"nickName"];
            [args setObject:[selfContact m_nsHeadImgUrl] forKey:@"headImg"];
            [args setObject:nativeUrl forKey:@"nativeUrl"];
            [args setObject:msgWrap.m_nsFromUsr forKey:@"sessionUserName"];

            [[[%c(MMServiceCenter) defaultCenter] getService:[%c(WCRedEnvelopesLogicMgr) class]] OpenRedEnvelopesRequest:args];
        }
    }
}

%end

使用block 进行封装

- (void)AsyncOnAddMsg:(NSString *)fromUser MsgWrap:(CMessageWrap *)wrap {
    %orig;
 NSLog(@"m_nsContent:%@", wrap.m_nsContent);
     NSLog(@"wrap.m_uiMessageType:%ld",(long)wrap.m_uiMessageType);
    switch(wrap.m_uiMessageType) {

//见下面代码

}


}

case 49: { // AppNode
        //判断是否为链接加群消息
        if ([wrap.m_nsContent containsString:@"邀请你加入群聊"]) {
            NSLog(@"判断是为链接加群消息");
            isEnterGroupChatMsg = YES;
            id MainFrameLogic = [objc_getClass("MainFrameLogicController") new];
            id NewMainFrame = [objc_getClass("NewMainFrameViewController") new];
            CContactMgr *contactManager = [[objc_getClass("MMServiceCenter") defaultCenter] getService:[objc_getClass("CContactMgr") class]];
            CContact *contact = [contactManager getContactByName:wrap.m_nsFromUsr];
            
            //页面跳转
            id data = objc_msgSend(MainFrameLogic, @selector(getSessionInfoByContact:), contact);
            objc_msgSend(NewMainFrame, @selector(openMessageContentView:startSendMessage:msgWrapToAdd:animated:jumpToFirstUnreadNode:indexPath:), data, NO, NULL, YES, NO, NULL);
        } 
        /** 是否为红包消息 */
        BOOL (^isRedEnvelopMessage)() = ^BOOL() {
            return [wrap.m_nsContent rangeOfString:@"wxpay://"].location != NSNotFound;
        };
        if (isRedEnvelopMessage()) { // 红包
            isEnterGroupChatMsg = NO;
            CContactMgr *contactManager = [[%c(MMServiceCenter) defaultCenter] getService:[%c(CContactMgr) class]];
            CContact *selfContact = [contactManager getSelfContact];
            /** 是否自己给自己发消息 */
            BOOL (^isSender)() = ^BOOL() {
                return [wrap.m_nsFromUsr isEqualToString:selfContact.m_nsUsrName];
            };
            /** 是否自己在群聊中发消息 */
            BOOL (^isGroupSender)() = ^BOOL() {
                return isSender() && [wrap.m_nsToUsr rangeOfString:@"chatroom"].location != NSNotFound;
            };
            /** 是否自动抢红包 */
            BOOL (^shouldReceiveRedEnvelop)() = ^BOOL() {
                return YES;
            };
            NSDictionary *(^parseNativeUrl)(NSString *nativeUrl) = ^(NSString *nativeUrl) {
                nativeUrl = [nativeUrl substringFromIndex:[@"wxpay://c2cbizmessagehandler/hongbao/receivehongbao?" length]];
                return [%c(WCBizUtil) dictionaryWithDecodedComponets:nativeUrl separator:@"&"];
            };
            /** 获取服务端验证参数 */
            void (^queryRedEnvelopesReqeust)(NSDictionary *nativeUrlDict) = ^(NSDictionary *nativeUrlDict) {
                NSMutableDictionary *params = [@{} mutableCopy];
                params[@"agreeDuty"] = @"0";
                params[@"channelId"] = [nativeUrlDict stringForKey:@"channelid"];
                params[@"inWay"] = @"0";
                params[@"msgType"] = [nativeUrlDict stringForKey:@"msgtype"];
                params[@"nativeUrl"] = [[wrap m_oWCPayInfoItem] m_c2cNativeUrl];
                params[@"sendId"] = [nativeUrlDict stringForKey:@"sendid"];
                NSLog(@"抢红包了");
                //抢红包的方法
                WCRedEnvelopesLogicMgr *logicMgr = [[objc_getClass("MMServiceCenter") defaultCenter] getService:[objc_getClass("WCRedEnvelopesLogicMgr") class]];
                [logicMgr ReceiverQueryRedEnvelopesRequest:params];
            };
            /** 储存参数 */
            void (^enqueueParam)(NSDictionary *nativeUrlDict) = ^(NSDictionary *nativeUrlDict) {
                    WeChatRedEnvelopParam *mgrParams = [[WeChatRedEnvelopParam alloc] init];
                    mgrParams.msgType = [nativeUrlDict stringForKey:@"msgtype"];
                    mgrParams.sendId = [nativeUrlDict stringForKey:@"sendid"];
                    mgrParams.channelId = [nativeUrlDict stringForKey:@"channelid"];
                    mgrParams.nickName = [selfContact getContactDisplayName];
                    mgrParams.headImg = [selfContact m_nsHeadImgUrl];
                    mgrParams.nativeUrl = [[wrap m_oWCPayInfoItem] m_c2cNativeUrl];
                    mgrParams.sessionUserName = isGroupSender() ? wrap.m_nsToUsr : wrap.m_nsFromUsr;
                    mgrParams.sign = [nativeUrlDict stringForKey:@"sign"];
                    mgrParams.isGroupSender = isGroupSender();
                    [[WBRedEnvelopParamQueue sharedQueue] enqueue:mgrParams];
            };
/** */
            if (shouldReceiveRedEnvelop()) {
                NSString *nativeUrl = [[wrap m_oWCPayInfoItem] m_c2cNativeUrl];
                NSDictionary *nativeUrlDict = parseNativeUrl(nativeUrl);
                queryRedEnvelopesReqeust(nativeUrlDict);
                enqueueParam(nativeUrlDict);
            }
        }
        break;
    }