94 lines
2.5 KiB
C++
94 lines
2.5 KiB
C++
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/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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RemoveDDEFlagFromShellExecuteEx.cpp
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Abstract:
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Some applications call ShellExecute which in turn calls ShellExecuteEx.
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One of the flags in the SHELLEXECUTEINFO structure is 'SEE_MASK_FLAG_DDEWAIT'.
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This flag gets set by ShellExecuteEx as a default whenever ShellExecute is
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called.
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Here is the description for the flag:
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'Wait for the DDE conversation to terminate before returning
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(if the ShellExecuteEx function causes a DDE conversation to start).
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The SEE_MASK_FLAG_DDEWAIT flag must be specified if the thread calling
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ShellExecuteEx does not have a message loop or if the thread or process
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will terminate soon after ShellExecuteEx returns. Under such conditions,
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the calling thread will not be available to complete the DDE conversation,
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so it is important that ShellExecuteEx complete the conversation before
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returning control to the caller. Failure to complete the conversation can
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result in an unsuccessful launch of the document.
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If the calling thread has a message loop and will exist for some time
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after the call to ShellExecuteEx returns, the SEE_MASK_FLAG_DDEWAIT
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flag is optional. If the flag is omitted, the calling thread's message
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pump will be used to complete the DDE conversation. The calling application
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regains control sooner, since the DDE conversation can be completed in the background.'
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When the flag gets passed, it can sometimes cause synchronzation problems.
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An example is Photo Express Platinum 2000. It attempts to launch Internet Explorer,
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but IE wreaks havoc on the app that made the call.
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This shim simply removes this flag from the ShellExecuteEx call.
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Notes:
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This is a general purpose shim.
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History:
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04/16/2001 rparsons Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(RemoveDDEFlagFromShellExecuteEx)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(ShellExecuteExW)
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APIHOOK_ENUM_END
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/*++
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Hook the call to ShellExecuteExW and remove the flag.
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--*/
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BOOL
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APIHOOK(ShellExecuteExW)(
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LPSHELLEXECUTEINFO lpExecInfo
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)
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{
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lpExecInfo->fMask = lpExecInfo->fMask & ~SEE_MASK_FLAG_DDEWAIT;
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LOGN( eDbgLevelInfo, "Removed SEE_MASK_FLAG_DDEWAIT from ShellExecuteExW");
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return ORIGINAL_API(ShellExecuteExW)(lpExecInfo);
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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APIHOOK_ENTRY(SHELL32.DLL, ShellExecuteExW)
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HOOK_END
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IMPLEMENT_SHIM_END
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