Question

Binary ADO Stream::Write always fails with 0x800A0BB9 (invalid arguments). (VC++)

Asked by: JasonCipriani

I have an ADO Stream, opened in binary mode, and I want to write binary data to that stream. Below is a test program that compiles as a console application in VC++ 2008. It simply creates a new stream, opens it in binary mode, and attempts to write some data. Write() fails with error 0x800A0BB9 (invalid argument). I have no idea why.

If I open the stream in text mode and use WriteText, it works with no problem. If I open the stream in binary mode and use WriteText, it fails as expected (illegal operation). But, no matter what mode I open the stream in, when I use Write, it fails.

I have tried other VARIANT types besides the one in the code snippet below (arrays, other simple types), all with the same results. (In my actual program, I'm attempting to write an array of bytes as a SAFEARRAY wrapped in a VARIANT).

I've also tried setting the stream mode before opening it, with no effect. I have verified that the stream is open in binary mode by getting it's type and checking that it is adTypeBinary.

What am I doing wrong here? Why is Write failing every time? How do I write binary data to an ADO Stream?

In case you are wondering, the reason I am doing this is because I'm using CDOSYS to send emails with attachments, and I'm constructing attachments from blocks of arbitrary binary data in memory. The Stream in question is the decoded content stream from an IBodyPart. However, it seems to have nothing to do with CDOSYS, as I'm having the same problem in the test case below.

Thanks!

(Edit: Question rewritten -- it's pretty much the same as my first comment below now)

#import "C:\Program Files\Common Files\System\ado\msado15.dll" no_namespace raw_interfaces_only
#include <cstdio>
#include <stdexcept>
#include <string>
 
using namespace std;
 
 
struct auto_coinit {
    auto_coinit () { CoInitializeEx(NULL, COINIT_MULTITHREADED); }
    ~auto_coinit () { CoUninitialize(); }
};
 
 
struct error_code : public runtime_error {
    static string estr (const char *w, DWORD c) { 
        char s[100]; 
        _snprintf_s(s, _TRUNCATE, "%s: 0x%08lX", w, c); 
        return s; 
    }
    error_code (const char *w, DWORD c) : runtime_error(estr(w, c)) { }
};
 
 
int main () {
 
    try {
 
        auto_coinit coinit;
        _StreamPtr s;
        HRESULT r;
 
        r = s.CreateInstance(__uuidof(Stream));
        if (FAILED(r))
            throw error_code("CreateInstance", r);
 
        // stream test code starts here (open, set binary, write)
 
        r = s->Open(vtMissing, adModeUnknown, adOpenStreamUnspecified, _bstr_t(), _bstr_t());
        if (FAILED(r))
            throw error_code("Open", r);
 
        r = s->put_Type(adTypeBinary);
        if (FAILED(r))
            throw error_code("put_Type", r);
 
        _variant_t v;
        v.vt = VT_UI1;
        v.bVal = 'x';
 
        r = s->Write(v);
        if (FAILED(r))
            throw error_code("Write", r);
 
        // stream test code ends here
 
    } catch (const exception &x) {
 
        fprintf(stderr, "error: %s\n", x.what());
 
    }
 
    printf("finished\n");
    getchar();
 
}
                                  
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Asked On
2009-09-19 at 09:01:24ID24745660
Tags

ado stream write safearray variant 0x800A0BB9

Topics

Databases Miscellaneous

,

Microsoft Visual C++

,

Microsoft Development

Participating Experts
2
Points
500
Comments
9

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Answers

 

by: JasonCiprianiPosted on 2009-09-19 at 14:31:32ID: 25374755

This may clear it up: Here is a test program that compiles as a console application in VC++ 2008. It simply creates a new stream, opens it in binary mode, and attempts to write some data. Write() fails with error 0x800A0BB9 (invalid argument). I have no idea why.

If I open the stream in text mode and use WriteText, it works with no problem. If I open the stream in binary mode and use WriteText, it fails as expected (illegal operation). No matter what mode I open the stream in, when I use Write, it fails.

I have tried other VARIANT types besides the one in the code snippet below (arrays, other simple types), all with the same results.

#import "C:\Program Files\Common Files\System\ado\msado15.dll" no_namespace raw_interfaces_only
#include <cstdio>
#include <stdexcept>
#include <string>
 
using namespace std;
 
 
struct auto_coinit {
    auto_coinit () { CoInitializeEx(NULL, COINIT_MULTITHREADED); }
    ~auto_coinit () { CoUninitialize(); }
};
 
 
struct error_code : public runtime_error {
    static string estr (const char *w, DWORD c) { 
        char s[100]; 
        _snprintf_s(s, _TRUNCATE, "%s: 0x%08lX", w, c); 
        return s; 
    }
    error_code (const char *w, DWORD c) : runtime_error(estr(w, c)) { }
};
 
 
int main () {
 
    try {
 
        auto_coinit coinit;
        _StreamPtr s;
        HRESULT r;
 
        r = s.CreateInstance(__uuidof(Stream));
        if (FAILED(r))
            throw error_code("CreateInstance", r);
 
        // stream test code starts here (open, set binary, write)
 
        r = s->Open(vtMissing, adModeUnknown, adOpenStreamUnspecified, _bstr_t(), _bstr_t());
        if (FAILED(r))
            throw error_code("Open", r);
 
        r = s->put_Type(adTypeBinary);
        if (FAILED(r))
            throw error_code("put_Type", r);
 
        _variant_t v;
        v.vt = VT_UI1;
        v.bVal = 'x';
 
        r = s->Write(v);
        if (FAILED(r))
            throw error_code("Write", r);
 
        // stream test code ends here
 
    } catch (const exception &x) {
 
        fprintf(stderr, "error: %s\n", x.what());
 
    }
 
    printf("finished\n");
    getchar();
 
}
                                              
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by: fredtheredPosted on 2009-09-21 at 08:35:31ID: 25384003

Have you tried creating a variant array and passing VT_ARRAY/VT_ARRAYREF?

 

by: DanRollinsPosted on 2009-09-21 at 14:19:16ID: 25387742

The Write method specifies that you pass it variant that is an array of bytes.
http://msdn.microsoft.com/en-us/library/ms675017(VS.85).aspx
You are passing it a variant that is a single byte.

Note that Write does not accept a length parameter.  To know how many bytes to write, it gets the length from the array variant.

 

by: JasonCiprianiPosted on 2009-09-21 at 14:54:43ID: 25388027

@fredthered and DanRollins:

Thanks for your reply. Yes, I did try using an array. In fact, an array is what I intend to use, although the example I posted had the simpler types. I've attached code to this comment that uses a SAFEARRAY of bytes (VT_UI1). It makes no difference, and fails in exactly the same way (Write fails with 0x800A0BB9). It's very frustrating. What else could I be doing wrong?

#import "C:\Program Files\Common Files\System\ado\msado15.dll" no_namespace raw_interfaces_only
#include <cstdio>
#include <stdexcept>
#include <string>
 
using namespace std;
 
 
struct auto_coinit {
    auto_coinit () { CoInitializeEx(NULL, COINIT_MULTITHREADED); }
    ~auto_coinit () { CoUninitialize(); }
};
 
 
struct error_code : public runtime_error {
    static string estr (const char *w, DWORD c) { 
        char s[100]; 
        _snprintf_s(s, _TRUNCATE, "%s: 0x%08lX", w, c); 
        return s; 
    }
    error_code (const char *w, DWORD c) : runtime_error(estr(w, c)) { }
};
 
 
class safearray_t {
public:
    safearray_t (VARTYPE vt, unsigned elems) { arr_ = SafeArrayCreateVector(vt, 0, elems); }
    ~safearray_t () { SafeArrayDestroy(arr_); }
    operator SAFEARRAY * () { return arr_; }
private:
    SAFEARRAY *arr_;
};
 
int main () {
 
    try {
 
        auto_coinit coinit;
        _StreamPtr s;
        HRESULT r;
 
        r = s.CreateInstance(__uuidof(Stream));
        if (FAILED(r))
            throw error_code("CreateInstance", r);
 
        // stream test code starts here (open, set binary, write)
 
        r = s->Open(vtMissing, adModeUnknown, adOpenStreamUnspecified, _bstr_t(), _bstr_t());
        if (FAILED(r))
            throw error_code("Open", r);
 
        r = s->put_Type(adTypeBinary);
        if (FAILED(r))
            throw error_code("put_Type", r);
 
        safearray_t arr(VT_UI1, 100);
 
        _variant_t v;
        v.vt = VT_ARRAY;
        v.parray = arr;
 
        r = s->Write(v);
        if (FAILED(r))
            throw error_code("Write", r);
 
        // stream test code ends here
 
    } catch (const exception &x) {
 
        fprintf(stderr, "error: %s\n", x.what());
 
    }
 
    printf("finished\n");
    getchar();
 
}

                                              
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by: DanRollinsPosted on 2009-09-21 at 16:42:45ID: 25388698

The below sequence does return S_OK to the Write... but I don't know if it actually works. I copied it from

http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.vc.database&tid=445966b9-986e-4049-84fa-d172a6deda45&cat=en_US_f570f9cb-5c35-4d29-9b60-7fee704bb077&lang=en&cr=US&sloc=&p=1 

_variant_t var;
int size=10;
SAFEARRAY *pSA = SafeArrayCreateVector(VT_UI1, 0, size); 
byte *pBlobData = (byte*)"1234567890"; 
byte *pData;
r = SafeArrayAccessData(pSA, (void **)&pData); 
memcpy(pData, pBlobData, size); 
SafeArrayUnaccessData(pSA); 
 
// Assign the Safe array to a variant. 
var.vt = VT_ARRAY|VT_UI1; 
var.parray = pSA; 
 
        r = s->Write(var);

                                              
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by: JasonCiprianiPosted on 2009-09-21 at 17:17:28ID: 31630963

This is not a direct solution but the example shows I was typing my VARIANT wrong and forgetting to include VT_UI1 with VT_ARRAY.

 

by: JasonCiprianiPosted on 2009-09-21 at 17:19:58ID: 25388845

@DanRollins: Thank you so much! I knew it had to be something strange like that, because I wasn't finding anybody else on the internet with a similar problem.

Turns out I had forgot to include VT_UI1 with VT_ARRAY in the VARIANT type in the original code, and I lost sight of that when I started using non-array types to test. Actually using the correct type fixed the problem (I tested it, in addition to Write succeeding, it does in fact work correctly).

This has been tripping me up for literally days. Thanks for helping me see the error! :-)

J

20120131-EE-VQP-002

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