(C#) File Read Blocks

Demonstrates how to read a file in fixed-size blocks (except for the very last block).

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

// Demonstrates how to read a file in blocks,
// which can be useful when uploading to cloud storage
// services such as Azure, S3, Google, etc.

// For this example, we're simply writing the blocks
// to an output file, and then checking to see if the
// resulting file contents equals the original file contents.

byte[] dataBlock = null;

Chilkat.FileAccess facSrc = new Chilkat.FileAccess();
Chilkat.FileAccess facDest = new Chilkat.FileAccess();

string srcPath = "qa_data/xml/hamlet.xml";
string destPath = "qa_output/hamletOut.xml";

bool success = facSrc.OpenForRead(srcPath);
success = facDest.OpenForWrite(destPath);
// Assuming success for the example..

// How many 1024-byte blocks?  (Including 1 for the last partial block)
int numBlocks = facSrc.GetNumBlocks(1024);

int i = 0;
while ((i < numBlocks)) {
    dataBlock = facSrc.ReadBlock(i,1024);
    if (facSrc.LastMethodSuccess != true) {
        Debug.WriteLine(facSrc.LastErrorText);
        return;
    }

    success = facDest.FileWrite(dataBlock);
    if (success != true) {
        Debug.WriteLine(facDest.LastErrorText);
        return;
    }

    i = i + 1;
}

facSrc.FileClose();
facDest.FileClose();

bool bEqual = facSrc.FileContentsEqual(srcPath,destPath);
if (bEqual != true) {
    Debug.WriteLine("Something went wrong!");
    return;
}

Debug.WriteLine("File successfully copied by blocks.");