FPrintf仅打印出CString的第一个字母？

Question

I would like to use fprintf to print out some CStrings as well as some more text:

CString project = "Project";
FILE * pFile;
CString FileName = project + "_Stats.txt";
pFile = _wfopen(FileName, _T("w"));
fprintf(pFile, "Project Name: %s", project);

The file that is created is called "Project_Stats.txt" and the output should be "Project Name: Project" however I get "Project Name: P". Why does only the first letter get printed out and is there a way I can fix it?

Answer 1

pm100提供了正确的答案，然后将其删除-UNICODE CString的正确代码是%ls ，而不是%s 。

Answer 2

fprintf(pFile, "Project Name: %s", project.GetBuffer());

Answer 3

The function fprintf(FILE*, char*, ...) has no idea what type project should have. So the compiler will compile anything like a cast to void* . When you want a char* you have to use th GetBuffer() member of CString.

Answer 4

This happens because CString is in UNICODE, so to write ANSI text to your file first convert it to multi byte, ie:

CStringA projectA(project);

and then:

fprintf(pFile, "Project Name: %s", projectA.GetString());

Answer 5

Try

fprintf(pFile, "Project Name: %s", (const char_t*)project);

or

fprintf(pFile, "Project Name: %s", (const wchar_t*)project);

see this topic for further info http://msdn.microsoft.com/en-us/library/72b2swax.aspx

Answer 6

I don't have MFC now, but in Win32++ the following works properly (I have 1252 codepage, so Russian chars are not in 1252 codepage, also cpp file is saved as UTF-8 with BOM):

Win32xx::CString project{L"Z:\\Projectцц"};
FILE * pFile;
Win32xx::CString FileName{project + L"_Staпрпфts.txt"};
pFile = _wfopen(FileName.GetBuffer(FileName.GetLength()), _T("w, ccs=UTF-16LE"));
fwprintf(pFile, L"Project Name: %s", project.GetBuffer(project.GetLength()));

As a note never mix Unicode and ANSI methods in Win32. This also refers to string literals, use _T macro or just always make project Unicode and use L"" for sting literals.
Maybe is better to get used to something like boost::filesystem (which will be included in next standard) for file path handling and C++ streams for formatting. One thing to remember is that proper Unicode handling in Windows is a trial and error method, until you get it right.