Chinese characters displayed in osg are garbled

Create font function in OSG:

<pre name="code" class="cpp">osg::Node* CreateText(wchar_t * str,double pos[3],double rgba[4],int textSize ,char * TextName)
{

	osg::Vec3 position(pos[0],pos[1],pos[2]);
	osg::Vec4 color(rgba[0],rgba[1],rgba[2],rgba[3]);
	osg::Geode* geode = new osg::Geode();
	//setlocale(LC_ALL,"chs");
	char buff[255]="\0";
	sprintf(buff,"fonts/%s.TTF",TextName);
	std::string caiyun(buff);
	//Set the state, turn off the light
	osg::StateSet* stateset = geode->getOrCreateStateSet();
	stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
	//set font properties
	osgText::Text* text = new  osgText::Text;
	geode->addDrawable( text );
	//set font
	text->setFont(caiyun);
	text->setCharacterSize(textSize);
	//set the location
	text->setPosition(position);
	text->setText(str);
	text->setColor(color);
	//setlocale(LC_ALL,"C");
	//set the camera
	osg::Camera* camera = new osg::CameraNode;
	//Set the perspective matrix
	camera->setProjectionMatrix(osg::Matrix::ortho2D(0,1024,0,768));   
	camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
	// get default settings
	camera->setViewMatrix(osg::Matrix::identity());
	//Set the background to transparent, otherwise you can set ClearColor
	camera->setClearMask(GL_DEPTH_BUFFER_BIT);
	//Set the rendering order, it must be rendered last
	camera->setRenderOrder(osg::CameraNode::POST_RENDER);
	camera->addChild(geode);
	return camera;
}

call the create font function

<pre name="code" class="cpp">void osgCreateText(char* str,double pos[3],double rgba[4],int textSize ,char * TextName,char *osgNodeName)
{
 //...
}

Here is the job of converting the char * to the wchar_t * type.

At first I used the following way:

<pre name="code" class="cpp">char *str = "xxx";
size_t len = strlen(str) + 1;
size_t converted = 0;
wchar_t *Wstr;
Wstr = (wchar_t *)malloc(len * sizeof(wchar_t));
mbstowcs_s(&converted,Wstr,len,CStr,_TRUNCATE);

This way can convert char* to wchar_t *;

But after debugging, the result displayed in OSG is still garbled.

Later I tested a way:

<pre name="code" class="cpp">osg::ref_ptr<osg::Node> text2 = createText(L"你好dfa",osg::Vec3(20,21,0),osg::Vec4(255,255,0,1));

Can successfully display Chinese on OSG. It can be seen that "L" has a role to play, so what kind of holy spirit is this "L"?

Upon query, this L stands for wide character (unicode);

All I did was convert the char * to wide char and the problem was solved.

code show as below:

<pre name="code" class="cpp"> //Convert characters to wide characters
	int nLen = MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,str,-1,NULL,0);
	if (nLen > 0)
	{
		wchar_t * WStr = new wchar_t[nLen];
		MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,str,-1,WStr,nLen);
		osg::ref_ptr<osg::Node> text = CreateText(WStr,pos,rgba,textSize,TextName);
	//....
	}