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我正在从 Java 世界迁移到 C++,并试图移植一个示例。我收到一个错误,因为我没有正确访问我的数组。我尝试使用 -> 和 * 符号指向它们,但我很难理解它。我相信这是多次重复的相同基本错误。我已经强调了错误开始的三个区域,不包括相同错误的倍数。任何帮助都会对我理解该主题大有帮助。谢谢!

//--------------------------------------------------------------
void testApp::setup(){
    colorCount = 20;
    int *hueValues = new int[colorCount];
    int *saturationValues = new int[colorCount];
    int *brightnessValues = new int[colorCount];

ofColor::fromHsb(360, 100, 100, 100);
ofFill();
}

//--------------------------------------------------------------
void testApp::update(){

}

//--------------------------------------------------------------
void testApp::draw(){
    // ------ colors ------
    // create palette
    for (int i=0; i<colorCount; i++) {
        if (i%2 == 0) {
            hueValues[i] = (int) random(0,360);                  // invalid types 'int[int]' fr array subscript
            saturationValues[i] = 100;  
            brightnessValues[i] = (int) random(0,100);
        } 
        else {
            hueValues[i] = 195;
            saturationValues[i] = (int) random(0,100);
            brightnessValues[i] = 100;
        }
    }

    // ------ area tiling ------
    // count tiles
    int counter = 0;
    // row count and row height
    int rowCount = (int)random(5,40);                  // At this point in file
    float rowHeight = (float)ofGetHeight()/(float)rowCount;

    for(int i=0; i<rowCount; i++) {
        // seperate each line in parts  
        // how many fragments
        int partCount = i+1;
        parts = new float[0];                  // Cannot convert "float" to "float" in assignment

        for(int ii=0; ii<partCount; ii++) {
            // sub fragments or not?
            if (random(1.0) < 0.075) {
                // take care of big values      
                int fragments = (int)random(2,20);
                partCount = partCount + fragments; 
                for(int iii=0; iii<fragments; iii++) {
                    parts = append(parts, random(2));
                }              
            }  
            else {
                parts = append(parts, random(2,20));   
            }
        }

        // add all subparts
        float sumPartsTotal = 0;
        for(int ii=0; ii<partCount; ii++) sumPartsTotal += parts[ii];

        // draw rects
        float sumPartsNow = 0;
        for(int ii=0; ii<parts.length; ii++) {
            // get component color values
            int index = counter % colorCount;
            fill(hueValues[index],saturationValues[index],brightnessValues[index]);

            sumPartsNow += parts[ii];
            rect(map(sumPartsNow, 0,sumPartsTotal, 0,width),rowHeight*i, 
                 map(parts[ii], 0,sumPartsTotal, 0,width)*-1,rowHeight);

            counter++;
        }
    }  
}
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1 回答 1

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看起来您正在为setup()函数中的数组分配空间,但是您的指针是在本地定义的,因此一旦函数完成执行,就会超出范围;当您尝试在draw()函数中引用它们时,您会收到编译器错误,因为未找到/未正确定义符号。将int *hueValues/saturationValues/brightnessValues声明移到头文件的私有部分testAPP,将分配代码(new int[coloCount])保留在 setup 函数中,然后您应该能够在draw()函数中引用数组而不会出错。

测试应用程序.h:

private:
int* hueValues;
int* saturationValues;
int* brightnessValues;

测试应用程序.cpp

void testApp::setup(){
  hueValues = new int[colorCount];
  ...
}
于 2013-02-26T22:30:44.183 回答