Finally working PTP example for win32

ptp_working.c

#include <stdio.h>
#include <stdint.h>

#include <windows.h>
#include <winbase.h>
#include <devguid.h>
#include <regstr.h>
#include <winuser.h>
#include <devpkey.h>
#include <initguid.h>
#include <wia.h>

#include "ptpwin.h"

void runCommand(IWiaItemExtras *extras, DWORD code) {
	PTP_VENDOR_DATA_IN *pDataIn = NULL;
	PTP_VENDOR_DATA_OUT *pDataOut = NULL;
	DWORD dwDataInSize = sizeof( PTP_VENDOR_DATA_IN ) - 1;
	DWORD dwDataOutSize = sizeof( PTP_VENDOR_DATA_OUT ) - 1 + 0x1000;
	DWORD dwActualDataOutSize = 0;

	pDataIn = (PTP_VENDOR_DATA_IN *)malloc(dwDataInSize);
	if (!pDataIn) {
		return;
	}

	pDataOut = (PTP_VENDOR_DATA_OUT *)malloc(dwDataOutSize);
	if (!pDataOut) {
		return;
	}
	memset(pDataIn, 0, dwDataInSize);
	memset(pDataOut, 0, dwDataOutSize);

	pDataIn->OpCode = 0x1001;
	pDataIn->SessionId = 0;
	pDataIn->TransactionId = 0;
	pDataIn->NumParams = 0;
	
	pDataIn->NextPhase = PTP_NEXTPHASE_READ_DATA;

	int x = extras->lpVtbl->Escape(extras, code,
	(BYTE *)pDataIn, dwDataInSize,
	(BYTE *)pDataOut, dwDataOutSize,
	&dwActualDataOutSize);

	printf("Escape: %X\n", (x));
	
	printf("Response: %X\n", pDataOut->ResponseCode);
	
	free(pDataOut);
	free(pDataIn);
}

int main() {
	HRESULT x = CoInitialize(0);
	printf("CoInitialize: %d\n", x);
	
	IWiaDevMgr *wia;
	
	IEnumWIA_DEV_INFO *info;

	x = CoCreateInstance(
		&CLSID_WiaDevMgr,
		NULL,
		CLSCTX_LOCAL_SERVER,
		&IID_IWiaDevMgr,
		(LPVOID *)&wia
	);
	printf("CoCreateInstance: %d\n", x);

	x = wia->lpVtbl->EnumDeviceInfo(wia, WIA_DEVINFO_ENUM_LOCAL, &info);
	printf("EnumDeviceInfo: %d\n", x);

	while (1) {
		IWiaPropertyStorage *storage;
		x = info->lpVtbl->Next(info, 1, &storage, NULL);
		printf("Next: %d\n", x);
		if (x != S_OK) break;
		
		PROPSPEC PropSpec[2] = {0};
		PROPVARIANT PropVar[2] = {0};

		PropSpec[0].ulKind = PRSPEC_PROPID;
		PropSpec[0].propid = WIA_DIP_DEV_ID;

		PropSpec[1].ulKind = PRSPEC_PROPID;
		PropSpec[1].propid = WIA_DIP_DEV_NAME;
		
		x = storage->lpVtbl->ReadMultiple(storage, 2, PropSpec, PropVar);
		if (PropVar[0].vt == VT_BSTR)
		printf("Device ID: %ws\n", PropVar[0].bstrVal);
		
		if (PropVar[1].vt == VT_BSTR)
			printf("Device Name: %ws\n", PropVar[1].bstrVal);
		
		IWiaItem *item = NULL;
		x = wia->lpVtbl->CreateDevice(wia, PropVar[0].bstrVal, &item);
		printf("CreateDevice: %d\n", x);
		
		IWiaItemExtras *extras = NULL;
		x = item->lpVtbl->QueryInterface(item, &IID_IWiaItemExtras, (void **) &extras);
		printf("QueryInterface: %X\n", x);
		
		while (1) {
			Sleep(1000);
			runCommand(extras, ESCAPE_PTP_VENDOR_COMMAND);
		}
		
		extras->lpVtbl->Release(extras);
		item->lpVtbl->Release(item);
		storage->lpVtbl->Release(storage);
		FreePropVariantArray(2, PropVar);
	}
	
	info->lpVtbl->Release(info);
	wia->lpVtbl->Release(wia);

	//x = wia->lpVtbl->CreateDevice();
}