cocos2d-x Expression: invalid null pointer Expression: invalid null pointer 问题

来源：互联网发布：重庆软件工程学院编辑：程序博客网时间：2024/04/29 13:51

上问题：

Debug Assertion Failed!

Program: C:\Windows\system32\MSVCP110D.dll
File: c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstring
Line: 1143

Expression: invalid null pointer

For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts.

代码：

string GameScene::getFileByName(string pFileName){

   std::string fullPath = FileUtils::getInstance()->fullPathForFilename(pFileName.c_str());
   unsigned char* pBuffer = NULL;
   long bufferSize = 0;
   pBuffer = FileUtils::getInstance()->getFileData(fullPath.c_str(), "r", &bufferSize);
   log("%ld",bufferSize);
   //log("%s",pBuffer);
   for (int i = 0; i < bufferSize; ++i)
   {
       log("%c",pBuffer[i]);
   }
   if (pBuffer)
   {
       delete [] pBuffer;
       pBuffer = NULL;
   }
   return NULL;
}

前几天刚接触C++和cocos2d-x所以很多基础问题，这个问题是因为返回的NULL，我把他当成java 的写法了，

在c++里，NULL和0是通用的。（NULL本身是一个宏：#define NULL 0）

所以，是返回的地方写错了

改成return "";就OK了

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