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. C

#include <C_CkStringBuilder.h>
#include <C_CkBinData.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkStringBuilder sb;
    HCkBinData bd;
    HCkStringBuilder sbFilename;
    int index;
    BOOL mayHaveMore;
    const char *sBase64;
    int count;

    success = FALSE;

    sb = CkStringBuilder_Create();
    bd = CkBinData_Create();
    sbFilename = CkStringBuilder_Create();
    index = 1;

    success = CkStringBuilder_LoadFile(sb,"qa_data/html/oresp body.txt","utf-8");
    // Assume success.
    printf("length = %d\n",CkStringBuilder_getLength(sb));

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

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

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

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

            CkStringBuilder_SetString(sbFilename,"qa_output/png_");
            CkStringBuilder_AppendInt(sbFilename,index);
            CkStringBuilder_Append(sbFilename,".png");

            CkBinData_WriteFile(bd,CkStringBuilder_getAsString(sbFilename));

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

        index = index + 1;
    }

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

    printf("All done.\n");


    CkStringBuilder_Dispose(sb);
    CkBinData_Dispose(bd);
    CkStringBuilder_Dispose(sbFilename);

    }