SetWindowText truncates text in CView

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C++

MFC

I am writing an SDI explorer-style MFC application. I wish to open a file into the right pane, which is derived from a CView class.

I have read the file into a buffer and passed this to SetWindowText(buffer) to display the file contents. Although 'buffer' contains all the text, not all of it is displayed in the view. However, if I then call GetWindowTextLength, it returns the correct length. In the code below, dwLength, nActual and windowTextLength are all equal and their value is 133 220. This matches the files size of 133 220 bytes. The size of the text displayed appears to be only 13 633 bytes (I estimated this by deleting the contents that are not displayed and checking the file size).

//read file
CFile* pFile = new CFile(filePathAndName, CFile::modeRead);
ULONGLONG dwLength = pFile->GetLength();//I64u
char* buffer = new char[(int)dwLength + 1];//add one extra to make space for null terminator
buffer[dwLength] = 0; //This will make the last character a null terminator
UINT nActual = pFile->Read(buffer, static_cast<UINT>(dwLength));//sizeof(szBuffer));
	
//convert char* buffer to LPCTSTR
CString strLPCTSTR (buffer);
m_displayData = strLPCTSTR;

SetWindowText(m_displayData);

int windowTextLength = GetWindowTextLength();

Please, does anyone have any idea why all my data is not displayed? Or is there an alternative way to do this?
Many thanks.