C language and mfc read file data according to format

The function of the fscanf() function is to read one or more data in a format from a file;

For example, there is a row of data in the file,

22 3.34 hello

Then use fscanf(fp, "%d%f%s", &a, &f, str) to read integer, floating point, and string data at one time;

This function is located in the C standard library header file <stdio.h>;

Example;

The test files are as follows;

code; 

void CFiletest1View::OnDraw(CDC* pDC)
{
	CFiletest1Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	int a = 0;
	float f = 0;
	char str[100] = "";
	CString str1;
	int d=0;
	float f2=0;
 
	FILE* fp = fopen("test1.txt", "r");
	for(int i=0; i<3; i++)
	{
        fscanf(fp, "%d%f%s", &a, &f, str);
		str1.Format("%d，%f，%s", a, f, str);
		pDC->TextOut(50, 50 + i*20, str1);
		d += a;    
		f2 += f;
    }
	str1.Format("整数和：%d", d);
	pDC->TextOut(50, 115, str1);
	str1.Format("浮点数和：%f", f2);
	pDC->TextOut(50, 135, str1);
	fclose(fp);
}

Run as follows; 

The CStdioFile class is often used in MFC; can I still use the fscanf() function?

First, take a look. After using the CStdioFile class to open a file, the BOOL type is returned, and fscanf requires a FILE* type; if the file is opened with the C standard library function fopen, the FILE* type is returned;

Check the MFC documentation;

The CStdioFile class has a member m_pStream,

CStdioFile::m_pStream
    The m_pStream data member is a pointer to an open file returned by the C runtime function fopen. It is NULL if the file has never been opened or has been closed. 

According to the documentation, this m_pStream is the return value of the C standard library function fopen after opening the file;

Then change it to the following code and take a look;

void CFiletest1View::OnDraw(CDC* pDC)
{
	CFiletest1Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	int a = 0;
	float f = 0;
	char str[100] = "";
	CString str1;
	int d=0;
	float f2=0;
 
	CStdioFile file;
	file.Open("test1.txt", CFile::modeRead);

	for(int i=0; i<3; i++)
	{
      
      //根据字符类型读取txt文件中的数据
		fscanf(file.m_pStream, "%d%f%s", &a, &f, str);
		str1.Format("%d，%f，%s", a, f, str);
		pDC->TextOut(50, 50 + i*20, str1);
		d += a;    
		f2 += f;
    }
	str1.Format("整数和：%d", d);
	pDC->TextOut(50, 115, str1);
	str1.Format("浮点数和：%f", f2);
	pDC->TextOut(50, 135, str1);
	file.Close();
}

Run it; no problem, same;