Can someone tell me how I can use the rolling log feature of log4c API library?
There is only documentation on the functions it provides and there are so many.
If anyone has used rolling log with log4c, would be great to see how to configure it and use it.
Add something like this to your .log4crc file:
<rollingpolicy name="myrollingpolicy"
type="sizewin"
maxsize="1024"
maxnum="10"
/>
<appender name="myrollingfileappender"
type="rollingfile"
logdir="."
prefix="myprefix"
layout="dated"
rollingpolicy="myrollingpolicy"
/>
Then you do logging like normal with:
#include <stdio.h>
#include "log4c.h"
int main(int argc, char** argv) {
int rc = 0;
log4c_category_t* mycat = NULL;
if (log4c_init()) {
printf("log4c_init() failed");
rc = 1;
}
else{
mycat = log4c_category_get("log4c.examples.helloworld");
log4c_category_log(mycat, LOG4C_PRIORITY_ERROR, "Hello World!");
/* Explicitly call the log4c cleanup routine */
if ( log4c_fini()){
printf("log4c_fini() failed");
}
}
return 0;
}
This is all available in the examples from the log4c source code
Since this is a 3 month old question, just wondering if the Wikipedia page was tried -- http://en.wikipedia.org/wiki/Log4c#Development_with_Log4C.
Related
Hello.
First I'm sorry for my ita-english.
I want use gwan with aerospike but when run the servlet...problem.
I start with this example.c of aerospike. In file example.c I put gwan.h and this is the output ./gwan:
loading
hello.cs: to use .cs scripts, install C#..
hello.lua: to use .lua scripts, install Lua
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Linking example.c: undefined symbol: g_namespace
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
To run G-WAN, you must fix the error(s) or remove this Servlet.
Inside example.c:
#include "gwan.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <aerospike/aerospike.h>
#include <aerospike/aerospike_key.h>
#include <aerospike/aerospike_query.h>
#include <aerospike/as_error.h>
#include <aerospike/as_key.h>
#include <aerospike/as_query.h>
#include <aerospike/as_record.h>
#include <aerospike/as_status.h>
#include <aerospike/as_val.h>
#include "example_utils.h"
const char TEST_INDEX_NAME[] = "test-bin-index";
bool query_cb(const as_val* p_val, void* udata);
void cleanup(aerospike* p_as);
bool insert_records(aerospike* p_as);
int
main(int argc, char* argv[])
{
if (! example_get_opts(argc, argv, EXAMPLE_MULTI_KEY_OPTS)) {
exit(-1);
}
aerospike as;
example_connect_to_aerospike(&as);
example_remove_test_records(&as);
example_remove_index(&as, TEST_INDEX_NAME);
if (! example_create_integer_index(&as, "test-bin", TEST_INDEX_NAME))
{
cleanup(&as);
exit(-1);
}
if (! insert_records(&as)) {
cleanup(&as);
exit(-1);
}
if (! example_read_test_records(&as)) {
cleanup(&as);
exit(-1);
}
as_error err;
as_query query;
as_query_init(&query, g_namespace, g_set);
as_query_where_inita(&query, 1);
as_query_where(&query, "test-bin", as_integer_equals(7));
LOG("executing query: where test-bin = 7");
if (aerospike_query_foreach(&as, &err, NULL, &query, query_cb, NULL)
!= AEROSPIKE_OK) {
LOG("aerospike_query_foreach() returned %d - %s", err.code,
err.message);
as_query_destroy(&query);
cleanup(&as);
exit(-1);
}
LOG("query executed");
as_query_destroy(&query);
cleanup(&as);
LOG("simple query example successfully completed");
return 0;
}
bool
query_cb(const as_val* p_val, void* udata)
{
if (! p_val) {
LOG("query callback returned null - query is complete");
return true;
}
as_record* p_rec = as_record_fromval(p_val);
if (! p_rec) {
LOG("query callback returned non-as_record object");
return true;
}
LOG("query callback returned record:");
example_dump_record(p_rec);
return true;
}
void
cleanup(aerospike* p_as)
{
example_remove_test_records(p_as);
example_remove_index(p_as, TEST_INDEX_NAME);
example_cleanup(p_as);
}
bool
insert_records(aerospike* p_as)
{
set
as_record rec;
as_record_inita(&rec, 1);
for (uint32_t i = 0; i < g_n_keys; i++) {
as_error err;
as_key key;
as_key_init_int64(&key, g_namespace, g_set, (int64_t)i);
as_record_set_int64(&rec, "test-bin", (int64_t)i);
if (aerospike_key_put(p_as, &err, NULL, &key, &rec) != AEROSPIKE_OK) {
LOG("aerospike_key_put() returned %d - %s", err.code, err.message);
return false;
}
}
LOG("insert succeeded");
return true;
}
how can connect aerospike with gwan?
Thank you
You need to #pragma link your aerospike library, and make sure all your required header files are in the right place. See G-WAN FAQ or read example code in the G-WAN tarball.
Also, in G-WAN the return code of the main function will be used as HTTP response code, so avoid return -1;.
undefined symbol: g_namespace
the error message is clear. As long as this variable is undefined your C servlet won't compile.
I don't know your library but this variable is probably defined in a library include file - or must be defined by the end user (you). Check the library documentation.
Detailed steps to run Aerospike C-client example with G-WAN,
Download and extract G-WAN server tar on your system
You can start the G-WAN server using ./gwan script present in extracted folder, e.g. ./gwan_linux64-bit/
Get Aerospike C-client from https://github.com/aerospike/aerospike-client-c, and install on your system
Copy example.c to ./gwan_linux64-bit/0.0.0.0_8080/#0.0.0.0/csp/
Make following changes to example.c,
Add following #pragma directive,
#pragma include "/home/user/aerospike-client-c/examples/utils/src/include/"
This will help search example_utils.h, which is necessary for all the example scripts in C-client.
Add following #pragma directive,
#pragma link "/home/user/aerospike-client-c/examples/utils/src/main/example_utils.c"
We shall have to link example_utils.c, as it has definitions of all util functions used in example scripts.
Make changes to the return values. Retun proper HTTP error codes.
Now, you are good to go. Run ./gwan server and access your webservice through browser, http://127.0.0.1:8080/?example.c
I'm trying to generate an ECDHE key using OpenSSL 1.0.2a on Windows and have the following sample code:
#include <openssl/crypto.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/ecdh.h>
int main()
{
OpenSSL_add_all_algorithms(); ERR_load_crypto_strings();
EVP_PKEY_CTX* parameters_context = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL);
EVP_PKEY* cparameters = nullptr;
EVP_PKEY* private_key = nullptr;
if (EVP_PKEY_paramgen_init(parameters_context) != 1) { return 1; }
if (EVP_PKEY_CTX_set_ec_paramgen_curve_nid(parameters_context, NID_sect571k1) != 1) { return 1; }
if (EVP_PKEY_paramgen(parameters_context, &cparameters) != 1) { return 1; }
EVP_PKEY_CTX* key_generation_context = EVP_PKEY_CTX_new(cparameters, NULL);
if (!key_generation_context) { return 1; }
if (EVP_PKEY_keygen_init(key_generation_context) != 1) { return 1; }
if (EVP_PKEY_keygen(key_generation_context, &private_key) != 1) { return 1; }
BIO* bio = BIO_new(BIO_s_mem());
PEM_write_bio_PUBKEY(bio, private_key); // <== This is where things go wrong.
ERR_free_strings(); EVP_cleanup(); CRYPTO_cleanup_all_ex_data();
}
I tested the said code on other platforms (OSX and Debian Linux, using gcc) and it seems works fine (no errors reported under valgrind).
When I run it on Windows, it always fails on this line:
PEM_write_bio_PUBKEY(bio, private_key);
And I get this "nice" error screen:
I'm at loss figuring out what is wrong: from the many tutorials and documentation pages I could find, this seems to be the right way of doing things.
Before I spend another day trying to figure out what's wrong, I figured it might smarter to ask the community: is this the right way of generating and writing an ECDHE key as PEM format with OpenSSL ?
It was indeed a bug in OpenSSL.
From the OpenSSL-dev mailing-list:
On Tue, Mar 31, 2015, ****** ******* wrote:
>
if (!combine)
*pval = NULL;
I'd suggest deleting the two lines above. The structure should be
cleared without this and the above line is wrong for non pointer
fields anyway.
Steve.
-- Dr Stephen N. Henson. OpenSSL project core developer. Commercial tech support now available see: http://www.openssl.org
See also this other question for details.
I have some C code trying to use libharu. Although I can use every function of this library (even UTF8) I can hardly draw images. Here is some very basic code:
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <setjmp.h>
#include "hpdf.h"
jmp_buf env;
#ifdef HPDF_DLL
void __stdcall
#else
void
#endif
error_handler (HPDF_STATUS error_no,
HPDF_STATUS detail_no,
void *user_data)
{
printf ("ERROR: error_no=%04X, detail_no=%u\n", (HPDF_UINT)error_no,
(HPDF_UINT)detail_no);
longjmp(env, 1);
}
int main (int argc, char **argv)
{
HPDF_Doc pdf;
HPDF_Font font;
HPDF_Page page;
char fname[256];
HPDF_Image image;
strcpy (fname, argv[0]);
strcat (fname, ".pdf");
pdf = HPDF_New (error_handler, NULL);
if (!pdf) {
printf ("error: cannot create PdfDoc object\n");
return 1;
}
/* error-handler */
if (setjmp(env)) {
HPDF_Free (pdf);
return 1;
}
font = HPDF_GetFont (pdf, "Helvetica", NULL);
page = HPDF_AddPage (pdf);
HPDF_Page_SetWidth (page, 550);
HPDF_Page_SetHeight (page, 500);
image = HPDF_LoadPngImageFromFile (pdf, "img.png");
HPDF_SaveToFile (pdf, fname);
HPDF_Free (pdf);
return 0;
}
When I compile this I have ERROR: error_no=1015, detail_no=0. I have found a similar post in stackoverflow: this. However although original poster said the problem is solved it hardly helped mine. I moved img.png to a folder and recompiled the file. Changed the code that says /home/name/path/to/img.png which is the direct path to image. Nothing works. I "always" have the same error, but when I change the name of file I have ERROR: error_no=1017, detail_no=2 which basicly means program cannot find image (according to reference of libharu) So I deduce that program finds img.png; but, it's strange but, cannot allocate the necessary memory. Which is weird because I cannot see any reason for this program not to allocate memory. I have every kind of permission.
I am using GCC 4.7.2 under Ubuntu Quantal Quetzal and libharu 2.3.0 RC2. Thank you for your help.
Hello Equalities of polynomials .
I also encountered the same problem when i integrated the haru sdk in my macOS environment.
The error_handler returned ERROR: error_no=1017, detail_no=2,and then i checked the official document for haru at http://libharu.sourceforge.net/error_handling.html query 0x1017 indicates that the file failed to open, so i suspect that the second parameter of the HPDF_LoadPngImageFromFile method needs to pass an exact png image file path, so after I modified it, the problem was solved, and I hope to help you.
code ad follow:
char filename1[255];
strcpy(filename1, "/Users/xx/Downloads/lusaceg.com.png");
image = HPDF_LoadPngImageFromFile (pdf, filename1);
Faithfully yours.
I'm trying to set an emblem using gio
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <glib.h>
#include <gio/gio.h>
#include <stdio.h>
int main (int argc, char *argv[])
{
GFile *gfile = NULL;
g_type_init();
gfile = g_file_new_for_path("./foo.txt");
if (g_file_set_attribute_string(gfile,
"metadata::emblems",
"favorite",
G_FILE_QUERY_INFO_NONE,
NULL, NULL) == TRUE) {
puts("Success");
} else {
puts("Fail");
}
return 0;
}
if the file exists, the function returns TRUE, which, according the docs means the metadata was set, but Nautilus (GNOME) doesn't display the favorite emblem. There are not many example on the net, so I'm kind of stuck.
It looks like metadata::emblems needs an array of strings even if you are only setting one value.
This seems to work:
char *value[] = {"favorite", '\0'};
[...]
g_file_set_attribute(file, "metadata::emblems",
G_FILE_ATTRIBUTE_TYPE_STRINGV,
&value[0],
G_FILE_QUERY_INFO_NONE,
NULL, NULL);
If you want Nautilus to show an emblem, you need to actually provide an extension to Nautilus to do so. Your extension should use the nautilus-info-provider interface, and in the nautilus_info_provider_update_file_info()
function you can call the nautilus_file_info_add_emblem() function to add an emblem.
I am porting an existing windows based C++ application to 64 bit environment, and this is one of those weird errors.
In the code snippet you can that I am using openforwardonly and it used to work fine with our old setup but in the 64 bit environment it gives the problem of fetching only ONE recordset. Or it could be a problem with the MoveNext(); of ADO.
To circumvent it we started using adOpenStatic, and it worked fine for me for a while but only later realized that it has a performance hit and it is taking forever to get/iterative through values.
I request someone to try this code with both the flags and validate the behavior I am seeing.
Information about ado flags:
http://www.w3schools.com/ADO/met_rs_open.asp
Another EE topic
http://www.experts-exchange.com/Programming/Languages/Visual_Basic/VB_DB/Q_11520558.html
I remember seeing a MS support case, but I can't get to it now.
I would appreciate any help or suggestions. I know we are using old technology, but we want to move to the additional capabilities without changing code much.
// Dbtest.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <windows.h>
#include <stdio.h>
#include <time.h>
#import "C:\Program Files\Common Files\System\ADO\msado15.dll" \
no_namespace rename("EOF", "EndOfFile")
int main(int argc, char* argv[])
{
HRESULT hr = S_OK;
try
{
CoInitialize(NULL);
_bstr_t strCnn("Provider=OraOLEDB.Oracle;Data Source =****; User Id=****; password=***");
_ConnectionPtr m_pConn;
hr=m_pConn.CreateInstance(__uuidof(Connection));
if(FAILED(hr))
{
printf("Failed creating record set instance\n");
return 0;
}
m_pConn->Open(strCnn,"","",NULL);
//Open the Record set for getting records from Author table
_RecordsetPtr pRstDoctors = NULL;
time_t start,end1,end2;
pRstDoctors.CreateInstance(__uuidof(Recordset));
time(&start);
pRstDoctors->Open("select logid from log",strCnn, adOpenForwardOnly,
**adLockReadOnly**,adCmdText);
//Declare a variable of type _bstr_t
int valField1;
//int valField2;
pRstDoctors->MoveFirst();
//Loop through the Record set
if (!pRstDoctors->EndOfFile)
{
while(!pRstDoctors->EndOfFile)
{
valField1 = pRstDoctors->Fields->GetItem("logid")->Value.intVal;
// valField2 = pRstDoctors->Fields->GetItem("reportid")->Value.intVal;
// printf("%d - \n",valField1);
pRstDoctors->MoveNext();
}
}
time(&end1);
double dif=difftime(end1,start);
printf("time difference is %.2lf",dif);
}
catch(_com_error e)
{
printf("Error:%s\n",e);
}
CoUninitialize();
return 0;
}
Using "adOpenStatic" instead of "adOpenForwardOnly" will work
pRstDoctors->Open("select logid from log",strCnn, adOpenStatic,
**adLockReadOnly**,adCmdText);