Problem in Image Retrieving

Hi,

I am retrieving the image from DLL through vc++ dll. Actually Image is retrieving in Callback function of main function. When I writing that image file inside of the Callback function then no problem in retrieving. At the same I want to send the Imagedata to the another function and write the same which cause the error.

Here I given that code,

//Callback function

static ofstream out("capture.jpg", ios:ut|ios::binary);

switch( pProgress->lMessage )

case prMSG_DATA_HEADER:

break;

case prMSG_DATA:

for (prUInt32 index = 0; index < pProgress->lLength; index++)

out.write((const char*)CaptureImage,1024L);

break;

case prMSG_TERMINATION:

break;

return prOK;

Copy function:

void PowershotSdkDll::Copy(prUInt8 *pDataBuffer, prUInt32 dataLength)

// Byte managedDataBuffer __gc[] = new System::Byte[dataLength];

for (prUInt32 index = 0; index < dataLength; index++)

/// Write the data to the memoryStream

//pMemoryStream->Write(managedDataBuffer, 0, dataLength);

static ofstream out1("Copycapture.jpg", ios:ut|ios::binary|ios::app);

out1.write((const char*)managedDataBuffer, 1024L);

Pleae give your suggestion.

Thanks for your reply.

I need to bring the image data to the outside of the function. So I sent the data to the another function and write.

I do the same in Exe. When I tracing the code, the cursor move to another function with data and store it in byte array. But the image not displayed. I think that array data has not re-initialized.

So I need to know that how to re-assign that array and store that data.

Same as done in c# using Memorystream.write method. Can you suggest same in c++

Thanks for your reply.

Actually I have created the Dll with image creation inside of the dll function. When I invoke the Dll from java and displaying that image in screen. At that time image retrieving takes 50 more seconds to display. So that is my problem.

I need to send that full byte array data to the Java function and write image file in java. In Dll, the callback function calls repeteadly still full image capture. Each time retrieve 1024bytes from SDK library. So I need to append the data in memory stream of each time. Then only I send the full image data to the java function.

Can we write the data through the file only why not in memory stream

Please give your kind of suggestion.

If it is not restriction then why not retrieve that data to another function. I got the last block(1024) image data only.

How I write the data to the memory stream in contrinously

Writing the data inside of the callback function is working proberly. But When I try to write the data outside of the callback function that cause the problem.

Now I have changed my function as follows,

Default declaration:
static ofstream out("capture.jpg", ios:ut|ios::binary);

void PowershotSdkDll::Copy(prUInt8 *pDataBuffer, prUInt32 dataLength)
{
out.write((const char*)pDataBuffer, dataLength);
out.close();

}

In Callback function:

prResponse prSTDCALL MyGetFileDataFunction(
prHandle CameraHandle,
prObjectHandle ObjectHandle,
prContext Context,
prProgress* pProgress
)
{
/* Display progress */
switch( pProgress->lMessage )
{
case prMSG_DATA_HEADER:
break;
case prMSG_DATA:
PowershotDll:owershotSdkDll::Copy(pProgress->pbData,pProgress->lLength);
break;
case prMSG_TERMINATION:
break;
}
return prOK;
}


But I have retrieved the last block(1024) image data only. What is the problem

Still I couldn't solve the problem. So I have changed function as write the "capture.jpg" image to the Callback function and read that "Capture.jpg" image data in another function and send it to java function.

Here I mentioned code,

/* Display progress */

switch( pProgress->lMessage )

case prMSG_DATA_HEADER:

break;

case prMSG_DATA:

binary_file.write((const char*)pProgress->pbData,1024L);

break;

case prMSG_TERMINATION:

break;

return prOK;

Can You suggest

Yes. I tried. I got correct size of the image.

Actually our java team could not read the Pointer type. So I need to convert pointer data to byte array data. After converting the byte array data I will send to java function.

Thatswhy I convert the pointer to byte array.

If I can to send the data from callback function to outside of the function then all the problem should be solve. But I didn't solve that problem.

Please suggest me.