docs.sheetjs.com/docz/static/chakra/sheetjs.ch.cpp

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2023-04-09 06:58:43 +00:00
/* this sample is based off of the official ChakraCore examples */
#include "ChakraCore.h"
#include <stdlib.h>
#include <stdio.h>
#include <string>
#include <cstring>
#define FAIL_CHECK(cmd) \
do { \
JsErrorCode errCode = cmd; \
if (errCode != JsNoError) { \
printf("Error %d at '%s'\n", errCode, #cmd); \
return 1; \
} \
} while(0)
using namespace std;
static char *read_file(const char *filename, size_t *sz) {
FILE *f = fopen(filename, "rb");
if(!f) return NULL;
long fsize; { fseek(f, 0, SEEK_END); fsize = ftell(f); fseek(f, 0, SEEK_SET); }
char *buf = (char *)malloc(fsize * sizeof(char));
*sz = fread((void *) buf, 1, fsize, f);
fclose(f);
return buf;
}
#define EVAL_FILE(path) {\
JsValueRef filename; \
JsValueRef result; \
FAIL_CHECK(JsCreateString(path, strlen(path), &filename)); \
size_t len; const char* script = read_file(path, &len);\
JsValueRef src;\
FAIL_CHECK(JsCreateExternalArrayBuffer((void*)script, len, nullptr, nullptr, &src));\
FAIL_CHECK(JsRun(src, cookie++, filename, JsParseScriptAttributeNone, &result)); \
}
int main(int argc, char *argv[]) {
JsRuntimeHandle runtime;
JsContextRef context;
JsValueRef result;
size_t cookie = 0;
FAIL_CHECK(JsCreateRuntime(JsRuntimeAttributeNone, nullptr, &runtime));
FAIL_CHECK(JsCreateContext(runtime, &context));
FAIL_CHECK(JsSetCurrentContext(context));
JsValueRef global;
FAIL_CHECK(JsGetGlobalObject(&global));
EVAL_FILE("shim.min.js")
EVAL_FILE("xlsx.full.min.js")
JsValueRef buf_str;
FAIL_CHECK(JsCreateString("buf", strlen("buf"), &buf_str));
size_t len; char *buf = read_file(argv[1], &len);
JsValueRef ab;
FAIL_CHECK(JsCreateExternalArrayBuffer((void*)buf, len, nullptr, nullptr, &ab));
FAIL_CHECK(JsObjectSetProperty(global, buf_str, ab, true));
JsValueRef fname;
FAIL_CHECK(JsCreateString("<script>", strlen("<script>"), &fname));
const char* script_str =
"var wb = XLSX.read(buf);"
"var ws = wb.Sheets[wb.SheetNames[0]];"
"XLSX.utils.sheet_to_csv(ws);";
JsValueRef script;
FAIL_CHECK(JsCreateExternalArrayBuffer((void*)script_str, (size_t)strlen(script_str), nullptr, nullptr, &script));
FAIL_CHECK(JsRun(script, cookie++, fname, JsParseScriptAttributeNone, &result));
free(buf);
FAIL_CHECK(JsCopyString(result, nullptr, 0, &len));
buf = (char*)malloc(len + 1);
FAIL_CHECK(JsCopyString(result, buf, len + 1, nullptr));
buf[len] = 0;
printf("%s\n", buf);
free(buf);
FAIL_CHECK(JsSetCurrentContext(JS_INVALID_REFERENCE));
FAIL_CHECK(JsDisposeRuntime(runtime));
return 0;
}