Unicode C

Extract data:image/png;base64 from HTML

See more Base64 Examples

Demonstrates how to extract base64 image data from HTMl and save to files. Unicode C

#include <C_CkStringBuilderW.h>
#include <C_CkBinDataW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkStringBuilderW sb;
    HCkBinDataW bd;
    HCkStringBuilderW sbFilename;
    int index;
    BOOL mayHaveMore;
    const wchar_t *sBase64;
    int count;

    success = FALSE;

    sb = CkStringBuilderW_Create();
    bd = CkBinDataW_Create();
    sbFilename = CkStringBuilderW_Create();
    index = 1;

    success = CkStringBuilderW_LoadFile(sb,L"qa_data/html/oresp body.txt",L"utf-8");
    // Assume success.
    wprintf(L"length = %d\n",CkStringBuilderW_getLength(sb));

    mayHaveMore = TRUE;
    while (mayHaveMore == TRUE) {

        // Get the base64 between the 1st occurrence "data:image/png;base64," and "'"
        sBase64 = CkStringBuilderW_getBetween(sb,L"data:image/png;base64,",L"'");

        // If nothing is found, then we'll exit the loop because there are no more.
        mayHaveMore = CkStringBuilderW_getLastMethodSuccess(sb);

        if (CkStringBuilderW_getLastMethodSuccess(sb) == TRUE) {
            // Found something.
            // Load into bd and save.
            success = CkBinDataW_LoadEncoded(bd,sBase64,L"base64");

            CkStringBuilderW_SetString(sbFilename,L"qa_output/png_");
            CkStringBuilderW_AppendInt(sbFilename,index);
            CkStringBuilderW_Append(sbFilename,L".png");

            CkBinDataW_WriteFile(bd,CkStringBuilderW_getAsString(sbFilename));

            // Replace "data:image/png;base64" with "data:image-png;base64" so the next iteration finds the next occurrence.
            CkStringBuilderW_ReplaceFirst(sb,L"data:image/png;base64",L"data:image-png;base64");
        }

        index = index + 1;
    }

    // Restore our replacements..
    count = CkStringBuilderW_Replace(sb,L"data:image-png;base64",L"data:image/png;base64");

    wprintf(L"All done.\n");


    CkStringBuilderW_Dispose(sb);
    CkBinDataW_Dispose(bd);
    CkStringBuilderW_Dispose(sbFilename);

    }