c++ - 使用 shared_ptr 时内存泄漏

Question

 Detected memory leaks!
Dumping objects ->
{9370} normal block at 0x000000C16B24C480, 24 bytes long.
 Data: <`h=             > 60 68 3D FB F6 7F 00 00 01 00 00 00 01 00 00 00 
{8549} normal block at 0x000000C16B25CC30, 21627 bytes long.
 Data: <        0 %k    > FA FA FA FA FA FA FA FA 30 CC 25 6B C1 00 00 00 
{5196} normal block at 0x000000C16B253320, 12839 bytes long.
 Data: <                > CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD 
{192} normal block at 0x000000C16B24CE40, 24 bytes long.
 Data: < m=             > 20 6D 3D FB F6 7F 00 00 02 00 00 00 01 00 00 00 
{191} normal block at 0x000000C16B251780, 16 bytes long.
 Data: <  $k            > 10 DB 24 6B C1 00 00 00 00 00 00 00 00 00 00 00 
{190} normal block at 0x000000C16B251410, 16 bytes long.
 Data: <  $k            > F0 DA 24 6B C1 00 00 00 00 00 00 00 00 00 00 00 
{189} normal block at 0x000000C16B2514B0, 16 bytes long.
 Data: <  $k            > D0 DA 24 6B C1 00 00 00 00 00 00 00 00 00 00 00 
{188} normal block at 0x000000C16B2516E0, 16 bytes long.
 Data: <  $k            > B0 DA 24 6B C1 00 00 00 00 00 00 00 00 00 00 00 
{187} normal block at 0x000000C16B251690, 16 bytes long.
 Data: <  $k            > 90 DA 24 6B C1 00 00 00 00 00 00 00 00 00 00 00 
{186} normal block at 0x000000C16B251370, 16 bytes long.
 Data: <p $k            > 70 DA 24 6B C1 00 00 00 00 00 00 00 00 00 00 00 
{185} normal block at 0x000000C16B251230, 16 bytes long.
 Data: <P $k            > 50 DA 24 6B C1 00 00 00 00 00 00 00 00 00 00 00 
{184} normal block at 0x000000C16B24DA50, 224 bytes long.
 Data: <0 %k    @3%k    > 30 12 25 6B C1 00 00 00 40 33 25 6B C1 00 00 00 
{156} normal block at 0x000000C16B24C4E0, 24 bytes long.
 Data: <P $k    @ $k    > 50 DA 24 6B C1 00 00 00 40 CE 24 6B C1 00 00 00 
{155} normal block at 0x000000C16B24C300, 32 bytes long.
 Data: <../dataset/refer> 2E 2E 2F 64 61 74 61 73 65 74 2F 72 65 66 65 72 
{154} normal block at 0x000000C16B250AB0, 16 bytes long.
 Data: <   k            > A8 F4 09 6B C1 00 00 00 00 00 00 00 00 00 00 00 
Object dump complete.
'3DMM_1st.exe' (Win32): Loaded 'C:\Windows\System32\kernel.appcore.dll'. Cannot find or open the PDB file.
The program '[36392] 3DMM_1st.exe' has exited with code 1 (0x1).strong text

谁能帮帮我？我遇到了与内存泄漏有关的问题。不知道怎么解决，谁能给点建议，不胜感激。

这里有一些关于我的代码的信息。我创建了一个名为 ObjectData 的 struct 和一个名为 ObjectLoader 的 class，如下所示:

struct ObjectData {
    std::vector <glm::vec3> vertices, normals, colors;
    std::vector <glm::vec2> texCoords;
    std::vector <unsigned int> vIndices, uIndices, nIndices;
};

class ObjectLoader {
    private:
    std::tr1::shared_ptr<ObjectData> object;
    bool hasUV, hasNormals, hasColor, colorChecked, indexChecked;

    std::string parseString(std::string src, std::string code);
    std::vector<glm::vec3> parseVerColor(std::string src, std::string code);
    glm::vec2 parseVec2(std::string src, std::string code);
    glm::vec3 parseVec3(std::string src, std::string code);
    void addIndices(std::string str);
    void checkIndices(std::string str);
    void checkColors(std::string str);
    void loadObjects(std::string objPath);

    public:
    ObjectLoader(std::string objName);
    ~ObjectLoader();

    std::tr1::shared_ptr<ObjectData> getModel();
};

下面是getModel()和ObjectLoader()的实现代码:

std::tr1::shared_ptr<ObjectData> ObjectLoader::getModel() {
    return object;
}

ObjectLoader::ObjectLoader(std::string objName) {
    indexChecked = false;
    colorChecked = false;
    std::string fileName = objName;
    object = std::tr1::shared_ptr<ObjectData>(new ObjectData());
}

当我测试我的代码时，我遇到了与内存泄漏相关的问题。

这是我的测试代码:

    std::tr1::shared_ptr<ObjectLoader> loader = std::tr1::shared_ptr<ObjectLoader>(new ObjectLoader(fileName));
    std::tr1::shared_ptr<ObjectData> data = loader->getModel();
    _CrtDumpMemoryLeaks();

Answer 1

由于 std::shared_ptr 的范围，您在检测泄漏时遇到问题。

在代码中；

std::tr1::shared_ptr<ObjectLoader> loader = std::tr1::shared_ptr<ObjectLoader>(new ObjectLoader(fileName));
std::tr1::shared_ptr<ObjectData> data = loader->getModel();
_CrtDumpMemoryLeaks();

loader 和 data 析构函数，以及删除操作，直到 _CrtDumpMemoryLeaks(); 函数报告泄漏后才会运行。

添加一个额外的范围可以帮助解决这个问题，否则代码需要重构。

{
    std::tr1::shared_ptr<ObjectLoader> loader = std::tr1::shared_ptr<ObjectLoader>(new ObjectLoader(fileName));
    std::tr1::shared_ptr<ObjectData> data = loader->getModel();
} // destructors run here...
_CrtDumpMemoryLeaks();