写播放器的时候 添加功能多启动 后 首次启动的 最大化
..class ShareMem{public: QSharedMemory*share; char data; ~ShareMem() { share->detach(); delete share; } ShareMem() { share=new QSharedMemory("shareMem"); data = 2; cout << " create shareMem status : "<create(1, QSharedMemory::ReadWrite) << endl;; share->lock(); memcpy((char*)share->data(), &data, 1)); share->unlock(); //share->detach(); //delete share; } bool isNotify() { QSharedMemory share; share.setKey("shareMem"); share.attach(); share.lock(); memcpy(&data,share.data() , 1); share.unlock(); share.detach(); if (data== 2)return false; share.attach(); share.lock(); data = 2; memcpy((char*)share.data(), &data, 1); share.unlock(); share.detach(); return true; }...........};