(Unicode C++) File Read Blocks

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

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <CkByteData.h>
#include <CkFileAccessW.h>

void ChilkatSample(void)
    {
    // 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.

    CkByteData dataBlock;

    CkFileAccessW facSrc;
    CkFileAccessW facDest;

    const wchar_t *srcPath = L"qa_data/xml/hamlet.xml";
    const wchar_t *destPath = L"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)) {
        success = facSrc.ReadBlock(i,1024,dataBlock);
        if (facSrc.get_LastMethodSuccess() != true) {
            wprintf(L"%s\n",facSrc.lastErrorText());
            return;
        }

        success = facDest.FileWrite(dataBlock);
        if (success != true) {
            wprintf(L"%s\n",facDest.lastErrorText());
            return;
        }

        i = i + 1;
    }

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

    bool bEqual = facSrc.FileContentsEqual(srcPath,destPath);
    if (bEqual != true) {
        wprintf(L"Something went wrong!\n");
        return;
    }

    wprintf(L"File successfully copied by blocks.\n");
    }