Question

(5) 0x1c6235e1 in ProxyClass::Method_C (this=0xb3a0c8, sendFilePath=...) at ./src/ProxyClass.cpp:112

(6) 0x2c8706c1 in Class1::Method_B (this=0x1fc5a1, profile=0x2c8f2340 "fileProfile1", filePathAndFileName=0x0) at ./src/Class1.cpp:860

(7) 0x2c4ae4c0 in Method_B (profile=0x42c <Address 0x42c out of bounds>, filePathAndFileName=0x0) at ./src/Class1_interface.cpp:310

(8) 0x2c1e5c3c in Method_A (profile=0x42c <Address 0x42c out of bounds>, filename=0x2c601c1c "/tmp/temporaryfile.tmp") at ./src/file.cpp:890

我有上面使用gnu gdb调试的核心文件片段。此核心文件是在运行Linux的嵌入式系统上创建的。函数调用中没有对变量的操作...
我的问题如下：

为什么配置文件在第8帧看起来像Address 0x42c out of bounds，而在第9帧之前没有对配置文件进行任何更改，这怎么会变得有意义（“fileSchema”）？
我的嵌入式系统崩溃，因为filename(char *)等于0x2c601c1c，并且路径在第8帧“/tmp/temporaryfile.tmp”上打印如下。但是，再次没有对filename变量的操作，Method_A调用Method_B但是char指针在第7帧突然变为null（filePathAndFileName = 0x0）。然后，我的系统崩溃了。如何通过操作将char *指针转换为NULL？

崩溃发生在第6帧，因为在Class1::Method_B中执行了以下行"std::string filePath( filePathAndFileName);"。正在尝试将null char指针初始化为字符串，我认为它会导致崩溃和Abort信号（程序以信号6终止，Aborted。）。如何避免char *在方法之间的变量传递中变为null？知道为什么它变成了空吗？

static TUint16 Method_A(char* profile, char* filename)
{
    TUint16 a; //after the call of Method_B,the other part of this method being processed but anyway the code never passes to there because of th crash..
    Method_B(profile,filename);
    ...
    ...
    ...
    return a;
}

unsigned char Method_B_interface(char* profile, char* filePathAndFileName)
{
    unsigned char returnValue = 0;

    if ( callbackObject->Method_B( profile, filePathAndFileName ) )
    {
        returnValue = 1;
    }
    return returnValue;
}

bool Class1::Method_B(char* profile, char* filePathAndFileName)
{
    bool returnValue = true;

    std::string   filePathString( filePathAndFileName );
    std::string   profileString( profile );

    if(profileString == "fileProfile1")
    {
        if(xClass != NULL)
        {
            returnValue = xClass->Method_C(filePathString);
        }
    }
    ...
    ...
    ...
    return returnValue;
}

bool ProxyClass::Method_C(const std::string& exportFilePathAndFileName)
{
    bool returnValue;
    std::string message = "dummy", parameters;

    Serializer::serialize( message, exportFilePathAndFileName );
    proxyRequest->synchCall( message, parameters );

    getResponse(parameters);
    Serializer::deserialize( parameters, returnValue );

    return returnValue;
}

char指针在函数调用的传递中变为null

0 个答案: