pointer problem :)
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hi everyone, i'm working on a project which includes a DLL and a separate UserBroker (both written in ATL) object which is used for getting/setting registry keys and reading/writing to user directories. (the object will be used in Vista, so this is needed) i want to read some binary data from registry and i have written this function properly:
STDMETHODIMP CUserBroker::QueryBinaryValue(BSTR bstrKeyName, BSTR bstrValueName, BYTE **pValue, ULONG *pnBytes)the function body is simple. it just opens the registry key (using aCRegKey) and uses itsQueryBinaryValuemethod. the problem is somehow i just can't pass aBYTEarray to the other process (which calls theCUserBroker's method). the call to the method is this:arr = (BYTE *)malloc(1 * sizeof(BYTE)); pub->QueryBinaryValue(ATL::CComBSTR(s_bstrToolBarRegistryKey), ATL::CComBSTR("hop"), &arr, &dwSize); arr = (BYTE *)realloc(&arr[0], (dwSize) * sizeof(BYTE)); pub->QueryBinaryValue(ATL::CComBSTR(s_bstrToolBarRegistryKey), ATL::CComBSTR("hop"), &arr, &dwSize); delete arr;everything works fine until the first line ofCUserBroker::QueryBinaryValuemethod, where theBYTE**pointer points toBadPtr (0x00000000)immediately. the question: how can i pass aBYTEarray (or any other array) among processes? -
hi everyone, i'm working on a project which includes a DLL and a separate UserBroker (both written in ATL) object which is used for getting/setting registry keys and reading/writing to user directories. (the object will be used in Vista, so this is needed) i want to read some binary data from registry and i have written this function properly:
STDMETHODIMP CUserBroker::QueryBinaryValue(BSTR bstrKeyName, BSTR bstrValueName, BYTE **pValue, ULONG *pnBytes)the function body is simple. it just opens the registry key (using aCRegKey) and uses itsQueryBinaryValuemethod. the problem is somehow i just can't pass aBYTEarray to the other process (which calls theCUserBroker's method). the call to the method is this:arr = (BYTE *)malloc(1 * sizeof(BYTE)); pub->QueryBinaryValue(ATL::CComBSTR(s_bstrToolBarRegistryKey), ATL::CComBSTR("hop"), &arr, &dwSize); arr = (BYTE *)realloc(&arr[0], (dwSize) * sizeof(BYTE)); pub->QueryBinaryValue(ATL::CComBSTR(s_bstrToolBarRegistryKey), ATL::CComBSTR("hop"), &arr, &dwSize); delete arr;everything works fine until the first line ofCUserBroker::QueryBinaryValuemethod, where theBYTE**pointer points toBadPtr (0x00000000)immediately. the question: how can i pass aBYTEarray (or any other array) among processes?HAve a look at this http://msdn.microsoft.com/msdnmag/issues/0900/DataTrans/[^]. :)
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
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hi everyone, i'm working on a project which includes a DLL and a separate UserBroker (both written in ATL) object which is used for getting/setting registry keys and reading/writing to user directories. (the object will be used in Vista, so this is needed) i want to read some binary data from registry and i have written this function properly:
STDMETHODIMP CUserBroker::QueryBinaryValue(BSTR bstrKeyName, BSTR bstrValueName, BYTE **pValue, ULONG *pnBytes)the function body is simple. it just opens the registry key (using aCRegKey) and uses itsQueryBinaryValuemethod. the problem is somehow i just can't pass aBYTEarray to the other process (which calls theCUserBroker's method). the call to the method is this:arr = (BYTE *)malloc(1 * sizeof(BYTE)); pub->QueryBinaryValue(ATL::CComBSTR(s_bstrToolBarRegistryKey), ATL::CComBSTR("hop"), &arr, &dwSize); arr = (BYTE *)realloc(&arr[0], (dwSize) * sizeof(BYTE)); pub->QueryBinaryValue(ATL::CComBSTR(s_bstrToolBarRegistryKey), ATL::CComBSTR("hop"), &arr, &dwSize); delete arr;everything works fine until the first line ofCUserBroker::QueryBinaryValuemethod, where theBYTE**pointer points toBadPtr (0x00000000)immediately. the question: how can i pass aBYTEarray (or any other array) among processes?One way is to use WM_COPYDATA.
Best wishes, Hans
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hi everyone, i'm working on a project which includes a DLL and a separate UserBroker (both written in ATL) object which is used for getting/setting registry keys and reading/writing to user directories. (the object will be used in Vista, so this is needed) i want to read some binary data from registry and i have written this function properly:
STDMETHODIMP CUserBroker::QueryBinaryValue(BSTR bstrKeyName, BSTR bstrValueName, BYTE **pValue, ULONG *pnBytes)the function body is simple. it just opens the registry key (using aCRegKey) and uses itsQueryBinaryValuemethod. the problem is somehow i just can't pass aBYTEarray to the other process (which calls theCUserBroker's method). the call to the method is this:arr = (BYTE *)malloc(1 * sizeof(BYTE)); pub->QueryBinaryValue(ATL::CComBSTR(s_bstrToolBarRegistryKey), ATL::CComBSTR("hop"), &arr, &dwSize); arr = (BYTE *)realloc(&arr[0], (dwSize) * sizeof(BYTE)); pub->QueryBinaryValue(ATL::CComBSTR(s_bstrToolBarRegistryKey), ATL::CComBSTR("hop"), &arr, &dwSize); delete arr;everything works fine until the first line ofCUserBroker::QueryBinaryValuemethod, where theBYTE**pointer points toBadPtr (0x00000000)immediately. the question: how can i pass aBYTEarray (or any other array) among processes?thanks, the article was really helpful. i used
BSTRto pass the array safely among processes. i thought i needed some structure likeBSTRfor this, but couldn't imagine the solution would beBSTRitself :)WM_COPYDATAis useful too, but since my UserBroker does not have a window, i can't send the message to anywhere else. thanks again
