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Wlanapi.dll is accessed dynamically now (since not present on Windows Server by default)

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Simon Rozman
2016-03-11 12:29:42 +01:00
parent 40294e148a
commit 0e38debecb
1 changed files with 14 additions and 1 deletions
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15
include/atlex/atlwlan.h
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@@ -22,6 +22,12 @@
#include <atlstr.h> #include <atlstr.h>
#include <wlanapi.h> #include <wlanapi.h>
// Must not statically link to Wlanapi.dll as it is not available on Windows
// without a WLAN interface.
extern DWORD (WINAPI *pfnWlanReasonCodeToString)(__in DWORD dwReasonCode, __in DWORD dwBufferSize, __in_ecount(dwBufferSize) PWCHAR pStringBuffer, __reserved PVOID pReserved);
/// ///
/// \defgroup ATLWLANAPI WLAN API /// \defgroup ATLWLANAPI WLAN API
/// Integrates ATL classes with Microsoft WLAN API /// Integrates ATL classes with Microsoft WLAN API
@@ -33,17 +39,24 @@
/// ///
/// \sa [WlanReasonCodeToString function](https://msdn.microsoft.com/en-us/library/windows/desktop/ms706768.aspx) /// \sa [WlanReasonCodeToString function](https://msdn.microsoft.com/en-us/library/windows/desktop/ms706768.aspx)
/// ///
/// \note
/// Since Wlanapi.dll is not always present, the \c pfnWlanReasonCodeToString pointer to \c WlanReasonCodeToString
/// function must be loaded dynamically.
///
inline DWORD WlanReasonCodeToString(_In_ DWORD dwReasonCode, _Out_ ATL::CAtlStringW &sValue, __reserved PVOID pReserved) inline DWORD WlanReasonCodeToString(_In_ DWORD dwReasonCode, _Out_ ATL::CAtlStringW &sValue, __reserved PVOID pReserved)
{ {
DWORD dwSize = 0; DWORD dwSize = 0;
if (!::pfnWlanReasonCodeToString)
return ERROR_CALL_NOT_IMPLEMENTED;
for (;;) { for (;;) {
// Increment size and allocate buffer. // Increment size and allocate buffer.
LPWSTR szBuffer = sValue.GetBuffer(dwSize += 1024); LPWSTR szBuffer = sValue.GetBuffer(dwSize += 1024);
if (!szBuffer) return ERROR_OUTOFMEMORY; if (!szBuffer) return ERROR_OUTOFMEMORY;
// Try! // Try!
DWORD dwResult = ::WlanReasonCodeToString(dwReasonCode, dwSize, szBuffer, pReserved); DWORD dwResult = ::pfnWlanReasonCodeToString(dwReasonCode, dwSize, szBuffer, pReserved);
if (dwResult == NO_ERROR) { if (dwResult == NO_ERROR) {
DWORD dwLength = (DWORD)wcsnlen(szBuffer, dwSize); DWORD dwLength = (DWORD)wcsnlen(szBuffer, dwSize);
sValue.ReleaseBuffer(dwLength++); sValue.ReleaseBuffer(dwLength++);