帮忙看看是哪里出了问题！ - 编程论坛

程序代码：

#include <windows.h>

class CA
{
    private:
        const char *tValue;
    public:
        CA& operator=(const char* tNewValue);
        CA& operator+=(const char* tNewValue);
        operator const char*()
        {
            return this->tValue;
        }

};

CA& CA::operator=(const char* tNewValue)
{
    this->tValue = tNewValue;
    return *this;
}

CA& CA::operator+=(const char* tNewValue)
{
    char *pSz;

    pSz = new char(strlen(this->tValue)+strlen(tNewValue)+1);
    strcat(pSz,this->tValue);
    strcat(pSz,tNewValue);
    delete [] this->tValue;
    this->tValue = pSz;
    return *this;
}

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR     lpCommandLine,
                   int         nShowCmd)
{
    CA myca;

    myca = "TEST INFORMATION\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    myca += "0123456789\n";
    MessageBoxA(NULL,
                myca,
                "Debug information",
                MB_OK|MB_ICONINFORMATION);
    return 0;
}

可以运行！但是字符串前面不知道怎么会多出一些乱码来！，难道是连接字符串的时候tValue的指向被修改了？问题是肯定出在CA::operator+=里的！但是是什么问题？如何解决呢？请懂的人教教！