CryptBinaryToString and CryptStringToBinary

[Carl Forsman]

any example code show how to use both following function under Base64?

CryptBinaryToString and CryptStringToBinary

[Alex Blekhman]

C'mon, just google it.

http://www.google.com/codesearch?hl=en&q=show:npCO1J78wKs:jRQj0FkPIis:QLINJWDIvfc&sa=N&ct=rd&cs_p=http://www.adunar.com/webauth/SUWA_IIS6.zip&cs_f=src/B64.cpp

Alex

[Carl Forsman]

why this code does not work?

I used the CryptStringToBinary function to save the Base64 string to a
binary image file (test.png)

http://www.oniva.com/upload/1356/test.cpp

[Alex Blekhman]

"Carl Forsman" wrote:
> why this code does not work?
>
> I used the CryptStringToBinary function to save the Base64
> string to a binary image file (test.png)
>
> http://www.oniva.com/upload/1356/test.cpp

I don't know why does not work. It won't even compile. For
starters, you allocate an array of bytes with the size 1 byte. I
am in doubt that this array will be sufficient to hold the result
of conversion. I tried this code and it works for me:

#include <vector>
#include <algorithm>
#include <fstream>
#include <iterator>

int _tmain(int /*argc*/, _TCHAR* /*argv*/[])
{
LPCTSTR pszBase64 = _T("<base64 string goes here>");

// calculate the length of the buffer needed
//
DWORD cbBinary = 0;
BOOL bRet = CryptStringToBinary(
pszBase64,
_tcslen(pszBase64),
CRYPT_STRING_BASE64,
NULL,
&cbBinary,
NULL,
NULL);

if(bRet)
{
vector<BYTE> vecBin(cbBinary);

// decode base64 to binary
//
bRet = CryptStringToBinary(
pszBase64,
_tcslen(pszBase64),
CRYPT_STRING_BASE64,
&vecBin[0],
&cbBinary,
NULL,
NULL);

if(bRet)
{
// save decoded data
//
ofstream ofsPng(_T("test.png"),
ios_base::out | ios_base::binary);

if(!ofsPng.bad())
{
copy(vecBin.begin(), vecBin.end(),
ostream_iterator<BYTE>(ofsPng));
}
}
}

return 0;
}