125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
/*****************************************************************************
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*
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* ftpinet.cpp - Interfacing to WinINet
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*
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*****************************************************************************/
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#include "priv.h"
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#include "ftpinet.h"
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#define SHInterlockedCompareExchangePointer SHInterlockedCompareExchange
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/*****************************************************************************
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*
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* Const strings for our Wininet stuff.
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*
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*****************************************************************************/
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HINSTANCE g_hinstWininet = NULL; /* The DLL handle */
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HINTERNET g_hint = NULL; /* Shared internet anchor handle */
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#define SZ_WININET_AGENT TEXT("Microsoft(r) Windows(tm) FTP Folder")
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/*****************************************************************************\
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FUNCTION: InitWininet
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\*****************************************************************************/
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void InitWininet(void)
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{
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// You can't use a critical section around LoadLibrary().
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ASSERTNONCRITICAL;
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if (!g_hinstWininet)
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{
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HINSTANCE hinstTemp = LoadLibrary(TEXT("WININET.DLL"));
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if (EVAL(hinstTemp))
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{
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// Can we successfully put it here?
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if (SHInterlockedCompareExchangePointer((void **)&g_hinstWininet, hinstTemp, NULL))
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{
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// No, someone else beat us there.
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ASSERT(g_hinstWininet);
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FreeLibrary(hinstTemp);
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}
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}
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}
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if (EVAL(g_hinstWininet))
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{
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if (!g_hint)
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{
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HINTERNET hinternetTemp;
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EVAL(SUCCEEDED(InternetOpenWrap(TRUE, SZ_WININET_AGENT, PRE_CONFIG_INTERNET_ACCESS, 0, 0, 0, &hinternetTemp)));
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if (EVAL(hinternetTemp))
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{
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// Can we successfully put it here?
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if (SHInterlockedCompareExchangePointer((void **)&g_hint, hinternetTemp, NULL))
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{
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// No, someone else beat us there.
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ASSERT(g_hint);
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InternetCloseHandle(hinternetTemp);
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}
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}
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}
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}
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}
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/*****************************************************************************\
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FUNCTION: UnloadWininet
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\*****************************************************************************/
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void UnloadWininet(void)
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{
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// You can't use a critical section around FreeLibrary() (I think).
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ASSERTNONCRITICAL;
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if (g_hint)
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{
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HINTERNET hinternetTemp = InterlockedExchangePointer(&g_hint, NULL);
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if (hinternetTemp)
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{
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InternetCloseHandle(hinternetTemp);
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}
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}
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/************************
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// I want to unload wininet, I really do. But this function is called
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// during process un-attach and it's better to leak wininet than to
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// call FreeLibrary() during process unattach.
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if (g_hinstWininet)
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{
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HINSTANCE hinstTemp = (HINSTANCE)InterlockedExchangePointer((void **) &g_hinstWininet, NULL);
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if (hinstTemp)
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{
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FreeLibrary(hinstTemp);
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}
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}
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*********************/
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}
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/*****************************************************************************\
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* hintShared
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*
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* Obtain the shared internet handle that we use for all our stuff.
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* We load WinINet only on demand, so that quick things will be quick.
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* If this procedure fails, the reason can be obtained via GetLastError().
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* (Note that this assumes that we always try to InitWininet().)
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\*****************************************************************************/
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HINTERNET GetWininetSessionHandle(void)
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{
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// Avoid taking the critical section unless you really need to.
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if (!g_hint)
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{
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InitWininet();
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ASSERT(g_hint);
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}
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return g_hint;
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}
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