ANSI C and sqlite3_get_table: How to pass results array back to calling function? -


i'm trying pass results array generated sqlite3_get_table contained in function called function. working fine except can't array main function. replace char **sql_results with? here's code:

int main() {     char **sql_results = 0; // here      sql_select_table("getairports", query_string, airports_database,              sql_results, &recordcount,              &columncount);      (int = 0; < columncount; i++)         printf("%s\n", sql_results[i]); // generates "exc_bad_access"  }  void sql_select_table(const char *query_name, const char *sql_query,               const char *sql_database,               char **sql_results, int *recordcount,               int *columncount) {     sqlite3_get_table(open_database, sql_query,                  &sql_results, recordcount,                  columncount, &error_msg);  }

you're trying take address of 1 of sql_select_table arguments , doesn't think does; &sql_results address of local variable, won't let modify sql_results in main().

instead, pass char*** sql_select_table this: 

/* note sql_results char*** */ void sql_select_table(const char *query_name, const char *sql_query,               const char *sql_database,               char ***sql_results, int *recordcount,               int *columncount) {     sqlite3_get_table(open_database, sql_query,                  sql_results, recordcount,                  columncount, &error_msg);  }  int main() {     char **sql_results = 0;      /* note & on sql_results */     sql_select_table("getairports", query_string, airports_database,              &sql_results, &recordcount,              &columncount);      (int = 0; < columncount; i++)         printf("%s\n", sql_results[i]); // generates "exc_bad_access"  }

also, sqlite3_get_table deprecated:

this legacy interface preserved backwards compatibility. use of interface not recommended.

so might want start using sqlite3_exec instead.


Comments

Post a Comment

Popular posts from this blog

c# - SharpSVN - How to get the previous revision? -

i trying find efficient way previous revision of file text comparison using sharpsvn. using (svnclient c = new svnclient()) { c.authentication.defaultcredentials = new networkcredential( configurationmanager.appsettings.get("svnserviceusername") , configurationmanager.appsettings.get("svnservicepassword") , configurationmanager.appsettings.get("svnservicedomain") ); c.authentication.sslservertrusthandlers += new eventhandler<svnsslservertrusteventargs>(authentication_sslservertrusthandlers); collection<svnfileversioneventargs> fileversioncollection = new collection<svnfileversioneventargs>(); svnrevisionrange range = new svnrevisionrange(0, this.hooks.revision); svnfileversionsargs args = new svnfileversionsargs(); args.retrieveproperties = true; args.range = range; foreach (svnchangeitem item in log.changedpaths) { string path = this.repositorypath + it...
Read more

c++ - Is it possible to compile a VST on linux? -

for class project i'm attempting write vst plugin backed cuda. current cuda workflow on linux box, i'd prefer compile , link there. according wikipedia , should possible (i couldn't find steinberg documentation relevant linux) can't find makefile or instructions on how build if aren't using xcode or visual studio. i'm vst 3 sdk doesn't support linux. when try compile plugin under linux, error: ./base/source/fatomic.cpp:39:30: fatal error: libkern/osatomic.h: no such file or directory this issue caused following code in "vst3 sdk/base/source/fatomic.cpp" #if mac #include <libkern/osatomic.h> #if mac_os_x_version_min_required > mac_os_x_version_10_4 #define native_atomic_type (volatile int32_t*) #else #define native_atomic_type (int32_t*) #endif #elif windows #include <windows.h> #endif but hope compiling under linux work vst sdk 2.4. reading. jvstwrapper seems run on lin...
Read more

url - Querystring manipulation of email Address in PHP -

i using third party application (email2http) send me emailid, body , message. unable retrieve email id due name appended on , enclosed < , >. here querystring getting. test.php?from=ajay+reddy &subject=cx&body=somebody when print variable in php returns name , not email id. $from = $_get['from']; echo $from; //output ajay reddy please suggest me how can emailid also. i dont want use post method due testing , debugging. it's working fine. forgot use htmlentities() in debugging.
Read more