add libcurl example #72

[KorigamiK]

Addressing #72

[sharkwouter]

Thanks, I really appreciate the PR. I do feel it is a little more complex than it has to be for a basic example. Would it be okay if I changed it to only require curl, use pspdebug for output and slim it down to 2 files?

[KorigamiK]

Sure, would be nicer for an example

[sharkwouter]

Okay, I played around with this a bit now. I kind of forgot that the network dialog needs libgu to be initialized. It also turns out the pkgconfig of curl is kinda broken, since you need to include mbedtls, mbedcrypto and mbedx509 manually.

I have this now, but it freezes because it cannot show the dialog.

main.c:

#include <curl/curl.h>
#include <strings.h>
#include <pspsdk.h>
#include <pspnet_inet.h>
#include <psputility.h>
#include <pspgu.h>
#include <pspnet.h>
#include <pspnet_apctl.h>
#include <pspnet_resolver.h>

#include <pspdisplay.h>
#include <string.h>
#include <pspkernel.h>
#include <pspdebug.h>
#include <pspdisplay.h>
#include <stdlib.h>

// PSP_MODULE_INFO is required
PSP_MODULE_INFO("Curl Example", 0, 1, 0);
PSP_MAIN_THREAD_ATTR(PSP_THREAD_ATTR_USER);

int loading = 0;
int running = 1;
size_t buffer_size = 1024;


size_t writeCallback(char *contents, size_t size, size_t nmemb, void *userp) {
    size_t write_size = size * nmemb;
    if (write_size > buffer_size) {
        write_size = buffer_size;
    }
    strncpy((char *) userp, (char *)contents, write_size);
    return write_size;
}

CURLcode getRequest(const char * url, char * buffer) {
    CURL *curl = curl_easy_init();
    if (!curl) {
        return CURLE_FAILED_INIT;
    }

    curl_easy_setopt(curl, CURLOPT_URL, url);
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeCallback);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, buffer);
    curl_easy_setopt(curl, CURLOPT_BUFFERSIZE, buffer_size);
    curl_easy_setopt(curl, CURLOPT_VERBOSE, 0);
    curl_easy_setopt(curl, CURLOPT_USERAGENT, "curl/7.64.1");
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, curl_slist_append(NULL, "Accept: text/plain"));
    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
    curl_easy_setopt(curl, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1_2);
    curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 10L);
    curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
    curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 20L);
    curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_TRY);

    CURLcode res = curl_easy_perform(curl);

    curl_easy_cleanup(curl);
    return res;
}

char * getNewJoke() {
    char * response = calloc(sizeof(char), buffer_size);

    if (getRequest("https://icanhazdadjoke.com/", response) != CURLE_OK) {
        strcpy(response, "Failed to get joke :(");
    }

    return response;
}

int netDialog()
{
    int done = 0;

    pspUtilityNetconfData data;

    memset(&data, 0, sizeof(data));
    data.base.size = sizeof(data);
    data.base.language = PSP_SYSTEMPARAM_LANGUAGE_ENGLISH;
    data.base.buttonSwap = PSP_UTILITY_ACCEPT_CROSS;
    data.base.graphicsThread = 17;
    data.base.accessThread = 19;
    data.base.fontThread = 18;
    data.base.soundThread = 16;
    data.action = PSP_NETCONF_ACTION_CONNECTAP;

    struct pspUtilityNetconfAdhoc adhocparam;
    memset(&adhocparam, 0, sizeof(adhocparam));
    data.adhocparam = &adhocparam;

    sceUtilityNetconfInitStart(&data);

    while (!done)
    {
        sceDisplayWaitVblankStart();

        switch (sceUtilityNetconfGetStatus())
        {
        case PSP_UTILITY_DIALOG_NONE:
            break;

        case PSP_UTILITY_DIALOG_VISIBLE:
            sceUtilityNetconfUpdate(1);
            break;

        case PSP_UTILITY_DIALOG_QUIT:
            sceUtilityNetconfShutdownStart();
            break;

        case PSP_UTILITY_DIALOG_FINISHED:
            done = 1;
            break;

        default:
            break;
        }

        sceKernelDelayThread(10 * 1000); // 10 ms
    }

    return 1;
}

void startNetworking()
{
    sceUtilityLoadNetModule(PSP_NET_MODULE_COMMON);
    sceUtilityLoadNetModule(PSP_NET_MODULE_INET);

    sceNetInit(128 * 1024, 42, 4 * 1024, 42, 4 * 1024);
    sceNetInetInit();
    sceNetApctlInit(0x8000, 48);

    netDialog();
}

void stopNetworking()
{
    sceUtilityUnloadNetModule(PSP_NET_MODULE_INET);
    sceUtilityUnloadNetModule(PSP_NET_MODULE_COMMON);
    
    sceNetApctlTerm();
    sceNetInetTerm();
    sceNetTerm();
}

int exit_callback(int arg1, int arg2, void *common) {
    stopNetworking();
    sceKernelExitGame();
    return 0;
}

int callback_thread(SceSize args, void *argp) {
    int cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
    sceKernelRegisterExitCallback(cbid);
    sceKernelSleepThreadCB();
    return 0;
}

int setup_callbacks(void) {
    int thid = sceKernelCreateThread("update_thread", callback_thread, 0x11, 0xFA0, 0, 0);
    if(thid >= 0)
        sceKernelStartThread(thid, 0, 0);
    return thid;
}

int main(void)  {
    // Use above functions to make exiting possible
    setup_callbacks();

    startNetworking();

    char * joke = getNewJoke();
    
    // Print the received joke! on a debug screen on a loop
    pspDebugScreenInit();
    pspDebugScreenClear();
    while(1) {
        pspDebugScreenSetXY(0, 0);
        pspDebugScreenPrintf("%s", joke);
        sceDisplayWaitVblankStart();
    }

    return 0;
}

CMakeLists.txt:

cmake_minimum_required(VERSION 3.14)

project(curl-example)

add_executable(${PROJECT_NAME} main.c)

find_package(CURL REQUIRED)

include(FindPkgConfig)
pkg_search_module(CURL REQUIRED libcurl)

target_link_libraries(${PROJECT_NAME} PRIVATE
  ${CURL_LIBRARIES}
  mbedtls
  mbedcrypto
  mbedx509
  pspdebug
  pspdisplay
  pspge
  pspnet 
  pspnet_apctl
)

# Create an EBOOT.PBP file
create_pbp_file(
    TARGET ${PROJECT_NAME}
    ICON_PATH NULL
    BACKGROUND_PATH NULL
    PREVIEW_PATH NULL
    TITLE ${PROJECT_NAME}
    VERSION 01.00
)

[KorigamiK]

Ah yeah, i know this because you need to initialise graphics first to show the dialog :sad:

[KorigamiK]

I may be wrong here but I do believe it's not required to have PSP_MODULE_INFO in the source files because you can configure it through cmake. I think that's better for this.

[sharkwouter]

The reason you didn't need PSP_MODULE_INFO was because SDL2 makes it not needed, but I'm trying not to use SDL2. Maybe I could write the debug text to a texture.

[sharkwouter]

Honestly, I don't think I can simplify this much further. We should probably just add a screenshot, remove the json file and slightly simplify the CMakeLists.txt.

[sharkwouter]

I will get back to this and I'm really sorry I kept this laying around for so long.