Luciano Lucas - MI wrote:
> Hello Everybody,
>
> I have a big problem.
> I job with image processing in C++, and now i need transfer image array VB
> to DLL VC++.
>
> My Dll use others Dlls. This Dlls util VARIANT type to transfer image array.
>
> In Microsoft site help, have one example to transfer bytes array ( VB to
> ActiveX do in VC++)
>
> Code example to transform bytes array in VARIANT type:
>
> The problem is :
> - in VB we create bytes array (512 bytes)
> - in VC++ the bytes array is larger then 512 bytes.
>
> Please help me.
>
> void CDllDermalogMidApp::VBtoVCtoVB(const VARIANT FAR& Buffer)
> {
> // Verify the Variant contains SafeArray of Bytes
> if (Buffer.vt == (VT_ARRAY | VT_UI1)) {
> long Dims = SafeArrayGetDim(Buffer.parray);
> long UpperBounds;
> long LowerBounds;
>
> if (Dims == 1) {
> SafeArrayGetLBound(Buffer.parray, 1, &LowerBounds);
> SafeArrayGetUBound(Buffer.parray, 1, &UpperBounds);
>
> // Use LowerBounds and UpperBounds to force a specific
> // Array size as shown here or they can be used to
> // dynamically create the buffer.
> if ((LowerBounds == 0) && (UpperBounds == 512)) {
> // Reference pointer for accessing the SafeArray
> unsigned char* buff;
> // Variable to store the data from the SafeArray
> // could be a global variable or member of CBinDataCtrl
> // Shown as a local variable for demonstration purpose only
> unsigned char m_abBinaryData[512];
> SafeArrayAccessData (Buffer.parray, (void**)&buff);
> for (int i = 0; i < 512; i++) {
> // Handle the binary data in the buffers
> // Copying the data passed from VB to VC.
> m_abBinaryData[i] = buff[i];
>
> // Modifying the data to be passed back to VB
> buff[i] = 0;
> }
> SafeArrayUnaccessData (Buffer.parray);
> return;
> }
> }
> }
> AfxMessageBox ("Invalid parameter passed in VBtoVC method.\n The array
> may only have a single dimension.\n The array must contain 512 bytes.");
> }
>
>
> Luciano Lucas de Oliveira Junior
> Analista de Sistemas - Detran / Montreal Informática
> Desenvolvimento - (21) 3399-1645 Ramal 35
> Celular : (21) 9526-3979
SafeArrayGetLBound(), SafeArrayGetUBound(), SafeArrayAccessData(), and
SafeArrayUnaccessData() all return error messages on failure. You
should be checking for S_OK in your code.
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