我見過這個問題的很多帖子。無論如何無法解決我的問題。錯誤:'類'不命名類型C++
我的問題是,我想從我的B類發一聲我的A類A級已經有了B類聲明(B B),但不能做B級相同(A一)
可以看出,如果A類包括B類,那麼如果B類包括A類,則不起作用。 「A不命名類型」
我將顯示我的節拍器程序中的代碼。
這是testApp.h
#ifndef TESTAPP_H_
#define TESTAPP_H_
#pragma once
#include "ofMain.h"
#include "ofxSimpleGuiToo.h"
#include "ofxSynth.h"
#include "threadedObject.h"
class testApp : public ofBaseApp{
public:
// virtual string getName() { return "testApp"; }
testApp(){
}
ofxSynth synth;
threadedObject TO;
void setup();
void update();
void draw();
int count;
int rate;
int last_time;
void audioOut(float *input, int bufferSize, int nChannels);
ofSoundStream soundstream;
//testApp();
friend void bang();
void keyPressed (int key);
void keyReleased(int key);
void mouseMoved(int x, int y);
void mouseDragged(int x, int y, int button);
void mousePressed(int x, int y, int button);
void mouseReleased(int x, int y, int button);
void windowResized(int w, int h);
void dragEvent(ofDragInfo dragInfo);
void gotMessage(ofMessage msg);
ofEventArgs eventA;
int mainAppsCount;
void bang(){
synth.trigger();
}
private:
int bpm;
int current_bpm;
float current_frequency;
float frequency;
float volume;
};
#endif
#ifndef THREADED_OBJECT_H
#define THREADED_OBJECT_H
#pragma once
#include "ofMain.h"
#include "testApp.h"
這裏是threadedObject類!在這裏,我只是想送一「砰」地testApp
class threadedObject : public ofThread {
public:
testApp ta; #HERE IS THE FAIL
ofRectangle posRect;
int count;
int count2;
friend void bang();
double bpmToSeconds;
double changedBpm;
double sum;
int counter;
int check;
//--------------------------
threadedObject(){
// testApp hej;
count = 1;
count2=0;
bpmToSeconds=60;
changedBpm=135;
sum = bpmToSeconds/changedBpm;
counter=0;
}
//--------------------------
void start(){
startThread(true, false);
}
//--------------------------
void stop(){
stopThread();
}
//--------------------------
void threadedFunction(){
while(isThreadRunning() != 0){
if(lock()){
count++;
if(count>4) count= 1;
unlock();
counter++;
ofSleepMillis(getBpm() * 1000);
}
}
}
//--------------------------
void bpm(double bpm)
{
changedBpm=bpm;
sum = bpmToSeconds/changedBpm;
}
//--------------------------
double getBpm(){
return sum;
}
//--------------------------
void draw(){
string str = "I am a slowly increasing thread. \nmy current count is: ";
string tick = " TICK!";
string tock = " TOCK!";
posRect.set(150, 150, 0, 0);
if(lock()){
str += ofToString(count);
if(counter%4==0){
str += tock;
}else {
str += tick;
#Here i want to send a bang to testApp like ta.bang();
}
unlock();
}else{
str = "can't lock!\neither an error\nor the thread has stopped";
}
ofDrawBitmapString(str, 350, 156);
}
int getTick()
{
return counter;
}
};
#endif
顯示的testApp.cpp藏漢
#include "testApp.h"
static const int bufferSize = 512;
static const int sampleRate = 44100;
//--------------------------------------------------------------
void testApp::setup(){
volume = 0.5f;
gui.addTitle("Master volume");
gui.addSlider("Volume", volume, 0.5f, 1.f);
frequency = current_frequency = 0.1f;
gui.addTitle("Base Frequency");
gui.addSlider("frequency", frequency, 20.f, 2000.f);
bpm=current_bpm;
bpm=135;
gui.addTitle("Metronome");
gui.addSlider("Bpm", bpm, 40.f, 140.f);
mainAppsCount = 0;
TO.start();
gui.show();
synth.setSampleRate(sampleRate);
soundstream.setup(this, 2, 0, sampleRate, bufferSize, 4);
}
//--------------------------------------------------------------
void testApp::update(){
if(current_frequency != frequency)
{
synth.setFrequency(frequency);
current_frequency = frequency;
}
synth.setVolume(volume);
mainAppsCount++;
TO.bpm(bpm);
}
//--------------------------------------------------------------
void testApp::draw(){
ofSetHexColor(0xffffff);
TO.draw();
string str = "I am a the main opengl thread.\nmy current count is: ";
str += ofToString(mainAppsCount);
ofDrawBitmapString(str, 350, 256);
ofSetHexColor(0xff0033);
ofDrawBitmapString("press 's' to stop the thread and 'a' to start it", 250, 360);
gui.draw();
}
//--------------------------------------------------------------
void testApp::keyPressed(int key){
if (key == 'a'){
TO.start();
} else if (key == 's'){
TO.stop();
}
}
void testApp::audioOut(float * output, int bufferSize, int nChannels)
{
synth.audioOut(output, bufferSize, nChannels, 0);
}
//--------------------------------------------------------------
void testApp::mousePressed(int x, int y, int button){
bang(); #The bang is in testApp.h. for just triggering the synth to play!
}
那麼,怎樣才能用我的一聲()方法testApp.h在threadedobject.h ?
閱讀[本](http://stackoverflow.com/questions/16205367/two-template-classes-being-composed-of-a-member-of-each-other)。 – 2013-04-29 10:36:20
是的,我知道我應該使用指針/參考 在這種情況下testApp * ta; 但是我如何使用ta? TA->邦(); ta.bang(); 當我做ta->砰();我得到這個: 錯誤:在'((threadedObject *)this)成員'bang'的請求 - > threadedObject :: ta',它是非類類型'testApp *'| – Drole 2013-04-29 11:09:45
您應該在'threadedObject'類的定義之前放置前面聲明'class testApp;'。使用'ta-> bang();'因爲'ta'現在是一個指針。再次注意我在另一個問題中的解釋。在那裏,在類「A」的定義之前,我已經向前聲明瞭'B',即'class B;'。 – 2013-04-29 11:24:14