Qt中的路径问题

Qt+VS 开发环境，设置程序当前路径 调用 Windows 的 SetCurrentDirectory 接口 总是失败。

示例代码如下，后面注释 是执行结果。

	bool ret1 = SetCurrentDirectory("./print");   // false
	bool ret2 = SetCurrentDirectory(".\\print");  // false
	bool ret3 = SetCurrentDirectory("E:\DirPathTest\main\MyDemoQtProject\x64\Debug\print");        // false
	bool ret4 = SetCurrentDirectory("E:\\DirPathTest\\main\\MyDemoQtProject\\x64\\Debug\\print");  // true
	bool ret5 = SetCurrentDirectory("E:/DirPathTest/main/MyDemoQtProject/x64/Debug/print");        // true

	QString strPath = QDir::currentPath() + "/print";
	int len01 = (strPath.size());			// 57
	int nSize01 = sizeof(strPath);			// 8

	QChar* pQChar = strPath.data();
	//int len02 = strlen(pQChar);
	int nSize02 = sizeof(pQChar);			// 8

	const char* path = "E:/DirPathTest/main/MyDemoQtProject/x64/Debug/print";
	int len0 = strlen(path);				// 51
	int nSize0 = sizeof(path);				// 8
	bool ret6 = SetCurrentDirectory(path);				// true

	std::string str2 = strPath.toStdString();
	int len03 = strlen(str2.data());		// 57
	int len04 = str2.size();				// 57
	int nSize03 = sizeof(str2);				// 40
	int nSize04 = sizeof(str2.data());		// 8
	
	const char* arrPath = str2.c_str();		// 	
	int len05 = strlen(arrPath);			//57
	int nSize05 = sizeof(arrPath);			//8
	bool ret7 = SetCurrentDirectory((arrPath));			// false

	LPCSTR lpPathName = str2.c_str();		// (LPCSTR);
	int len06 = strlen(lpPathName);			// 57
	int nSize06 = sizeof(lpPathName);		// 8
	bool ret8 = SetCurrentDirectory(lpPathName);		// false
	
	LPCTSTR lpPathName2 = (LPCTSTR)(str2.c_str()); 
	int len07 = strlen(lpPathName2);		// 57
	int nSize07 = sizeof(arrPath);			// 8
	bool ret9 = SetCurrentDirectory(lpPathName2);		// false

	char dirPath[MAX_PATH] = {0};
	GetCurrentDirectory(MAX_PATH, dirPath); // #define MAX_PATH   260
	int len08 = strlen(dirPath);			// 51
	int nSize08 = sizeof(dirPath);			// 260
	bool ret10 = SetCurrentDirectory(dirPath);			// true

QDir::currentPath() 获取路径长度为 57，比实际长度多了6个字符，说明QDir::currentPath()  获取的路径已经添加了转义字符，在vs中Debug调试看不到转义字符，导致调用 SetCurrentDirectory 一直失败