CHString::FormatV method (chstring.h)

[The CHString class is part of the WMI Provider Framework which is now considered in final state, and no further development, enhancements, or updates will be available for non-security related issues affecting these libraries. The MI APIs should be used for all new development.]

The FormatV method writes a formatted string and a variable list of arguments to a CHString string.


void FormatV(
  LPCWSTR lpszFormat,
  va_list argList



Format control string.


List of arguments that are passed.

Return value



The FormatV method formats and stores a series of characters and values in the CHString string. The string and arguments are converted and output according to the corresponding format specification in lpszFormat.

If the string object is offered as a parameter to FormatV, the call fails.

Note  To reduce exposure to security attacks, always use a format string for FormatV. Never use a user-supplied string for the format string. If your format string is stored for a purpose such as localization, ensure that the string is protected from unauthorized write access. If your function writes to a string rather than standard output, you may need to avoid using a trailing "%s" in the format string. For more information, see and


Requirement Value
Minimum supported client Windows Vista
Minimum supported server Windows Server 2008
Target Platform Windows
Header chstring.h (include FwCommon.h)
Library FrameDyn.lib
DLL FrameDynOS.dll; FrameDyn.dll

See also