i try to use WIA to send data to a camera. I need to develop this in C++ so i used the official "tutorial" on https://learn.microsoft.com/en-us/windows/win32/wia/-wia-wia-tutorial I know another project that works with C# and i want to do the same on C++ (C# Project on: https://github.com/pixeltris/SonyAlphaUSB)
When i want to use Escape
Method https://learn.microsoft.com/en-us/windows/win32/api/wia_xp/nf-wia_xp-iwiaitemextras-escape i get the
Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call.
This is usually a result of calling a function declared with one calling
convention with a function pointer declared with a different calling convention.
Error and i hope you can help me to resolve this. My code looks like this:
//initialize wia
HRESULT h = CoInitialize(NULL);
IWiaDevMgr* pWiaDevMgr = NULL;
//create wia device manager
HRESULT hr = CreateWiaDeviceManager(&pWiaDevMgr);
//show connected devices and get deviceId
BSTR bstrDeviceID = SysAllocString(L"");
HRESULT hr2 = EnumerateWiaDevices(pWiaDevMgr, &bstrDeviceID);
//create device with device id
IWiaItem* ppWiaDevice;
HRESULT hr3 = CreateWiaDevice(pWiaDevMgr, bstrDeviceID, &ppWiaDevice);
//case IWiaItem to IWiaItemExtras
IWiaItemExtras* ppWiaExtra = (IWiaItemExtras*)ppWiaDevice;
//try to send data
DWORD dwEscapeCode = 256;
BYTE* lpInData = new unsigned char[37]{ 0x01, 0x92, 0x00 , 0x00 , 0x00, 0x00, 0x00 , 0x00 , 0x00 , 0x01 ,
0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 ,
0x00, 0x00, 0x00, 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x03 ,
0x00 , 0x00 , 0x00 , 0x03 , 0x00 , 0x00 , 0x00 };
DWORD cbInDataSize = sizeof(lpInData);
BYTE* pOutData = new unsigned char[4]{ 0x00 , 0x00,0x00, 0x00};
DWORD dwOutDataSize = sizeof(pOutData);
DWORD pdwActualDataSize = NULL;
BSTR bstre = SysAllocString(L"");
//just to test if ppWiaExtra is working
HRESULT hr6 = ppWiaExtra->GetExtendedErrorInfo(&bstre); //works
//try to send data with Escape Method
//see https://learn.microsoft.com/en-us/windows/win32/api/wia_xp/nf-wia_xp-iwiaitemextras-escape
HRESULT hr5 = ppWiaExtra->Escape(dwEscapeCode, lpInData, cbInDataSize, pOutData, dwOutDataSize, &pdwActualDataSize); //Run-Time Check Failure #0
The Methods i use are the same as in the example code on https://github.com/microsoft/Windows-classic-samples/blob/master/Samples/Win7Samples/multimedia/wia/wiassamp/wiassamp.cpp
The Escape Method is:
virtual /* [helpstring] */ HRESULT STDMETHODCALLTYPE Escape(
/* [in] */ DWORD dwEscapeCode,
/* [size_is][in] */ __RPC__in_ecount_full(cbInDataSize) BYTE *lpInData,
/* [in] */ DWORD cbInDataSize,
/* [length_is][size_is][out] */ __RPC__out_ecount_part(dwOutDataSize, pdwActualDataSize ? *pdwActualDataSize : dwOutDataSize) BYTE *pOutData,
/* [in] */ DWORD dwOutDataSize,
/* [out] */ __RPC__out DWORD *pdwActualDataSize) = 0;
So how can i find the actual problem why the error is shown and how can i resolve it?
(I use WIA1 because WIA2 doesn't find the device)
STDMETHODCALLTYPE
is defined in winnt.h as following:
#if defined(_WIN32) || defined(_MPPC_)
// Win32 doesn't support __export
#ifdef _68K_
#define STDMETHODCALLTYPE __cdecl
#else
#define STDMETHODCALLTYPE __stdcall
#endif
#define STDMETHODVCALLTYPE __cdecl
#define STDAPICALLTYPE __stdcall
#define STDAPIVCALLTYPE __cdecl
#else
#define STDMETHODCALLTYPE __export __stdcall
#define STDMETHODVCALLTYPE __export __cdecl
#define STDAPICALLTYPE __export __stdcall
#define STDAPIVCALLTYPE __export __cdecl
#endif
EDIT 1:
GetExtendedErrorInfo
now returns Not Implemented Error (but that's currently not so important for me)
The bigger Problem is that
ppWiaExtra->Escape
returns E_FAIL
and that one is unspecified, i think it's some pointer
problem again or an issue with my usage of sizeof
IWiaItemExtras* ppWiaExtra = (IWiaItemExtras*)ppWiaDevice;
This line is not correct; you can't just cast pointers to get different COM interfaces. That's what QueryInterface is for:
IWiaItemExtras* ppWiaExtra;
HRESULT result = ppWiaDevice->QueryInterface(IID_PPV_ARGS(&ppWiaExtra));