Calling svn.exe from C++ code!

For some reason, I need to call svn.exe in my code, following is just a test
hard written code,
What am I doing is just 'svn diff'.
but it doesn't work. Not touch a c:\abc123.txt file.
Thanks in advance!
        TCHAR szExePath[] = TEXT("C:\\Program Files\\Subversion\\bin\\svn.exe");
        SHELLEXECUTEINFO shinfo = {0};
        shinfo.cbSize = sizeof(SHELLEXECUTEINFO);
        shinfo.fMask = SEE_MASK_NO_CONSOLE;
        shinfo.hwnd = NULL;
        shinfo.lpVerb = TEXT("open");
        shinfo.lpFile = szExePath;
        shinfo.lpParameters = TEXT(" diff -r 755:HEAD E:\\workcopy\\Main.cpp >
c:\\abc123.txt");
        shinfo.lpDirectory = NULL;
        shinfo.nShow = SW_SHOW;
        shinfo.hInstApp = NULL;
        BOOL bRet = FALSE;
        bRet = ::ShellExecuteEx(&shinfo); --------->here return value is TRUE,
and I saw console flash

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