小编Mat*_*his的帖子

我正在使用 WebAssembly 并尝试从 C++ 发出 HTTPS 请求。我看过Emscripten FETCH API的解决方案并尝试使用它。

为了测试它，我创建了一个Test类，在其中发送如下请求：

void Test::sendRequest() {
    emscripten_fetch_attr_t attr;
    emscripten_fetch_attr_init(&attr);
    strcpy(attr.requestMethod, "GET");
    attr.attributes = EMSCRIPTEN_FETCH_LOAD_TO_MEMORY;
    attr.onsuccess = &Test::onSuccess;
    attr.onerror = &Test::onError;
    emscripten_fetch(&attr, "http://127.0.0.1:5000/");
}

我的 onSuccess 回调如下所示：

void Test::onSuccess(struct emscripten_fetch_t *fetch) {
    printf("Finished downloading %llu bytes from URL %s.\n", fetch->numBytes, fetch->url);
    setText(QString::fromUtf8(fetch->data));
    emscripten_fetch_close(fetch); // Free data associated with the fetch.
}

但是，当我尝试编译时出现错误：

error: assigning to 'void (*)(struct emscripten_fetch_t *)' from incompatible type 'void
  (Test::*)(struct emscripten_fetch_t *)'
attr.onsuccess = &Test::onSuccess;
                 ^~~~~~~~~~~~~~~~ …