i m just a beginner and i m using c++, wxwidget and mysql
manually i m capable to add data in ListCtrl but when i m filling data in ListCtrl , conversion showing some problem
i know how to add data in wxListCtrl
ex-
data_list_control->InsertColumn(0,wxT("Country"),2);
data_list_control->SetColumnWidth(0, 110);
data_list_control->InsertColumn(1,wxT("State"),2);
data_list_control->SetColumnWidth(1, 110);
data_list_control->InsertColumn(2,wxT("Zip"),2);
data_list_control->SetColumnWidth(2, 160);
long index = data_list_control->InsertItem(0, wxT("India"));
data_list_control->SetItem(index, 1, wxT("U.p"));
data_list_control->SetItem(index, 2, wxT("208005"));
with the help of this we can get
India U.p 208005 in wxListCtrl but when i am filling this with database then conversion of varchar to wxString creating a problem, it is showing all the result but in garbage form
i m doing mysql connectivity, look at this
while((row=mysql_fetch_row(result)))
{
long index=data_list_control->InsertItem(i,wxT(row[i]));
i++;
for(j=1;j<num_fields;j++)
{
data_list_control->SetItem(index,j,wxT(row[j]));
}
}
if database have three row then listctrl also showing three row but value are in unexpected form..
i only want to know how to convert varchar, int , long or any database data type to wxString format.
List_Ctrl_Data obj1 ;
MYSQL_RES *database_table_data;
database_table_data=obj1.getdata();
if (database_table_data==NULL)
{
int decision = wxMessageBox(wxT("CAN NOT CONNECT TO DATABASE"), wxT("Message"), wxOK | wxICON_INFORMATION, NULL, -1, -1);
}
else if(mysql_num_rows(database_table_data)==0)
{
int decision = wxMessageBox(wxT("database has nothing to show"), wxT("Message"), wxOK | wxICON_INFORMATION, NULL, -1, -1);
}
else
{
int num_fields;
MYSQL_ROW row;
num_fields = mysql_num_fields(database_table_data);
long i=0;
int j;
while((row=mysql_fetch_row(database_table_data)))
{
const char* chars1 = row[0];
wxString mystring1(chars1, wxConvUTF8);
long index=data_list_control->InsertItem(i,mystring1);
i++;
for(j=1;j<num_fields;j++)
{
const char* chars2=row[j];
wxString mystring2(chars2,wxConvUTF8);
data_list_control->SetItem(index,j,mystring2);
}
}
}
}
void login::onbuttonclick(wxCommandEvent & WXUNUSED(event))
{
Close(true);
}
Related
enter image description here
Sorry im new to coding . I have searched up possible solutions for this on here but they didnt work. Im also confused on why some code appears grey compared to the rest.
https://1drv.ms/w/s!Ag8vVFKVPyOg6HeYLehGjQKdvl_3?e=QHY6t9
#include <stdio.h>
// initialised variables
int i = 0;
int count = 0;
void displayfunction(void);
int month = 0;
void highervalues(float array1[12], float array2[12]);
void highervalues(float array1[12], float array2[12]) {
for (i = 12; i > 0; i--) {
if (array2[i] > array1[i]) {
count = count + 1;
}
}
}
//Reading values for array1 and array2
void displayfunction(void) {
highervalues(array1[12] , array2[12]);
for (i = 0; i < 12; i++)
{
month = month + 1; // month increases by 1 after each input
printf_s("enter values for year 1 month %d", month);
scanf_s("%f", &array1[i]);
}
for (month = 12; month > 0; month--) {
}
for (i = 0; i < 12; i++) {
month = month + 1;
printf_s("enter values for year 2 month %d", month);
scanf_s("%f", &array2[i]);
}
}
/*comapring 2 arrays and increasing count value if there are any value in array2
are greater than array1*/
int main() {
displayfunction();
int array1[12];
int array2[12];
}
You have a fundamental misunderstanding of variable scope
int main() {
displayfunction();
int array1[12];
int array2[12];
}
Those arrays are only available in main. If you want other functions to operate on them you have to pass them as paramters to those functions. Plus they dont exist at the point where you try to call displayFunction
So change
void displayfunction(void)
to
void displayfunction(float array1[12], float array2[12])
then in main do
int main() {
int a1[12];
int a2[12];
displayfunction(a1, a2);
}
Note that I have changed the names here just to emphasise that its the not the fact that the names are the same thats important.
Please, I have list control on, I want to display my query result on a list control. The program runs without error, but it does not display the SQL result on the list control.
BOOL CClassDialog::OnInitDialog()
{
CDialogEx::OnInitDialog();
// TODO: Add extra initialization here
CString DSN;
DSN = _T("DRIVER=SQL Server;SERVER=DESKTOP-
DICUCDS\\SQL2K14;Trusted_Connection=Yes;APP=Microsoft\x00ae Visual Studio\x00ae 2013;WSID=DESKTOP-
DICUCDS;DATABASE=School");
CDatabase aDB;
try {
aDB.OpenEx(DSN);
CRecordset aRS(&aDB);
aRS.Open(CRecordset::forwardOnly, (L"SELECT DISTINCT Myclass FROM MyFacts"));
// populate Grids
ListView_SetExtendedListViewStyle(m_classlist, LVS_EX_GRIDLINES);
// Column width and heading
m_classlist.InsertColumn(1, L"Class", LVCFMT_LEFT, -1, 1);
m_classlist.InsertColumn(2, L"Age", LVCFMT_LEFT, -1, 1);
m_classlist.SetColumnWidth(0, 120);
m_classlist.SetColumnWidth(1, 200);
m_classlist.SetColumnWidth(2, 200);
while(!aRS.IsEOF())
{
CString strValue;
aRS.GetFieldValue(L"Myclass", strValue);
m_classlist.SetItemText(-1, 1, strValue);
//strValue.AddString(strValue);
aRS.MoveNext();
}
aRS.Close();
aDB.Close();
}
catch (CDBException * ex)
{
TCHAR buf[255];
ex->GetErrorMessage(buf, 255);
CString strPrompt(buf);
AfxMessageBox(strPrompt);
}
return TRUE; // return TRUE unless you set the focus to a control
// EXCEPTION: OCX Property Pages should return FALSE
}
void CClassDialog::ResetListControl()
{
m_classlist.DeleteAllItems();
int iNbrOfColumns;
CHeaderCtrl* pHeader = (CHeaderCtrl*)m_classlist.GetDlgItem(0);
if (pHeader) {
iNbrOfColumns = pHeader->GetItemCount();
}
for (int i = iNbrOfColumns; i >= 0; i--) {
m_classlist.DeleteColumn(i);
}
}
Are you sure this is right? m_classlist.SetItemText(-1, 1, strValue);
If you research the official documentation for the CListCtrl (for example, here) you will see:
CString strText;
int nColumnCount = m_myListCtrl.GetHeaderCtrl()->GetItemCount();
// Insert 10 items in the list view control.
for (int i = 0; i < 10; i++)
{
strText.Format(TEXT("item %d"), i);
// Insert the item, select every other item.
m_myListCtrl.InsertItem(LVIF_TEXT | LVIF_STATE, i, strText,
(i % 2) == 0 ? LVIS_SELECTED : 0, LVIS_SELECTED, 0, 0);
// Initialize the text of the subitems.
for (int j = 1; j < nColumnCount; j++)
{
strText.Format(TEXT("sub-item %d %d"), i, j);
m_myListCtrl.SetItemText(i, j, strText);
}
}
You are making references to SetItemText but you have not actually added any elements into the list. The code before shows an example:
// Insert the item, select every other item.
m_myListCtrl.InsertItem(LVIF_TEXT | LVIF_STATE, i, strText,
(i % 2) == 0 ? LVIS_SELECTED : 0, LVIS_SELECTED, 0, 0);
I am not saying that you have to use that specific set of paramaters. But the point is that you must insert an item into the list before you can update it's properties. Or even set the properties at the moment you add it into the list.
I'm running PG 9.5 on Win 10 64-bit. I'm compiling C under VS 2016.
I am forming a function that will evolve into a somewhat complex beast. To test out my initial efforts, the function accepts an array of int4 (this works fine and the code for processing it is not shown here). The function then grabs a few rows from a table, pushes the values into a FIFO, then pulls them out and renders the results. This approach is strategic to how the function will operate when complete.
The function works fine on first call, then throws this on any further calls:
ERROR: cache lookup failed for type 0 SQL state: XX000
I have no idea what is causing this.
However, sometimes it doesn't throw an error but executes without end.
Here is my code as lean as I can get it for question purposes:
PG:
CREATE TABLE md_key
(
id serial NOT NULL PRIMARY KEY,
pid int4 NOT NULL,
key integer NOT NULL,
vals int4[]
);
…
CREATE OR REPLACE FUNCTION md_key_query(int4[])
RETURNS TABLE (
id int4,
vals int4[]) AS E'\RoctPG', --abreviated for question
'md_key_query'
LANGUAGE c IMMUTABLE STRICT;
…
select * from md_key_query(array[1,2,3,4]::int4[])
C:
PG_FUNCTION_INFO_V1(md_key_query);
typedef struct
{
Datum id;
Datum vals;
} MdKeyNode;
typedef struct fifoAry
{
MdKeyNode nodes[32];
struct fifoAry *next;
int32 readpos;
int32 writepos;
} FifoAry;
typedef struct
{
FifoAry *fifo;
FifoAry *tail;
FifoAry *head;
uint32 nodescount;
Datum *retvals[2];
bool *retnulls[2];
} CtxArgs;
inline void push(CtxArgs *args, Datum id, Datum vals)
{
if (args->head->writepos == 32)
args->head = args->head->next = (FifoAry*)palloc0(sizeof(FifoAry));
MdKeyNode *node = &(args->head->nodes[args->head->writepos++]);
node->id = id;
node->vals = vals;
args->nodescount++;
}
inline MdKeyNode* pop(CtxArgs *args)
{
// if (!args->nodescount)
// return NULL;
if (args->tail->readpos == 32)
args->tail = args->tail->next;
args->nodescount--;
return &(args->tail->nodes[args->tail->readpos++]);
}
// use STRICT in the caller wrapper to ensure a null isn't passed in
PGMODULEEXPORT Datum md_key_query(PG_FUNCTION_ARGS)
{
uint32 i;
FuncCallContext *funcctx;
HeapTuple tuple;
MdKeyNode *node;
CtxArgs *args;
if (SRF_IS_FIRSTCALL())
{
funcctx = SRF_FIRSTCALL_INIT();
MemoryContext oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
ArrayType *a = PG_GETARG_ARRAYTYPE_P(0);
Datum *in_datums;
bool *in_nulls;
bool fieldNull;
SPITupleTable *tuptable = SPI_tuptable;
int32 ret;
uint32 proc;
if (get_call_result_type(fcinfo, NULL, &funcctx->tuple_desc) != TYPEFUNC_COMPOSITE)
ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("function returning record called in context that cannot accept type record")));
deconstruct_array(a, INT4OID, 4, true, 'i', &in_datums, &in_nulls, &ret);
if (!ret)
PG_RETURN_NULL();
(SPI_connect();
// initialize and set the cross-call structure
funcctx->user_fctx = args = (CtxArgs*)palloc0(sizeof(CtxArgs));
args->fifo = args->tail = args->head = (FifoAry*)palloc0(sizeof(FifoAry));
args->retvals = (Datum*)palloc(sizeof(Datum) * 2);
args->retnulls = (bool*)palloc0(sizeof(bool) * 2);
BlessTupleDesc(funcctx->tuple_desc);
// do some work here
// this is simply a test to see if this function is behaving as expected
ret = SPI_execute("select id, vals from public.md_key where vals is not null limit 64", true, 0);
if (ret <= 0)
ereport(ERROR, (errcode(ERRCODE_SQL_ROUTINE_EXCEPTION), errmsg("could not execute SQL")));
proc = SPI_processed;
if (proc > 0)
{
TupleDesc tupdesc = SPI_tuptable->tupdesc;
SPITupleTable *tuptable = SPI_tuptable;
for (i = 0; i < proc; i++)
{
tuple = tuptable->vals[i];
push(args, SPI_getbinval(tuple, tupdesc, 1, &fieldNull), SPI_getbinval(tuple, tupdesc, 2, &fieldNull));
}
}
SPI_finish();
MemoryContextSwitchTo(oldcontext);
}
funcctx = SRF_PERCALL_SETUP();
args = funcctx->user_fctx;
if (args->nodescount > 0)
{
node = pop(args);
args->retvals[0] = node->id;
args->retvals[1] = node->vals;
tuple = heap_form_tuple(funcctx->tuple_desc, args->retvals, args->retnulls);
SRF_RETURN_NEXT(funcctx, HeapTupleGetDatum(tuple));
}
else
{
SRF_RETURN_DONE(funcctx);
}
}
Fixed it. Moved one command as shown here:
{
// function is unstable if this is put earlier
SPI_finish();
SRF_RETURN_DONE(funcctx);
}
I am currently working on a project to use multiple kinect cameras to acquire x,y,z coordinates of skeletal data in SkeletalViewer. I have an idea to use the KinectID or index of different kinect cameras to extract the sets of skeletal joints data into 2 different text files. But I am not sure if I am doing right. Please help to take a look at the modification below, or I will appreciate all your kind advice on other method to solve this problem.
In SkeletalViewer.h, I modified as following:
public:
FILE* mp3DFile0;
FILE* mp3DFile1;
char mText[1024];
INuiSensor * m_pNuiSensor;
BSTR m_instanceId;
array SensorIndex;
In NuiImpl.cpp, I modified as following:
1) define array
ref class MyClass {
public:
int m_i;
};
array<MyClass^>^ arrSensor() {
int i;
array< MyClass^ >^ local = gcnew array< MyClass^ >(2);
for (i = 0; i < 2; i++) {
local[i] = gcnew MyClass;
local[i]->m_i = i;
}
return local;
}
2) create array to store sensor index to do for loop later
HRESULT CSkeletalViewerApp::Nui_Init( )
{
HRESULT hr;
bool result;
//create an array to store two file pointers
FILE* mp3DFile[] = { mp3DFile0, mp3DFile1 };
fopen_s(mp3DFile0, "D:/Kinect/KinectCam0.txt", "w+");
fopen_s(mp3DFile1, "D:/Kinect/KinectCam1.txt", "w+");
.
.
if ( !m_pNuiSensor )
{
hr = NuiCreateSensorByIndex(0, &m_pNuiSensor);
//I am not sure about how to utilize this index in this case
.
.
}
if (NuiGetSensorCount(&m_pNuiSensor) > 1)
{
array< MyClass^ >^ SensorIndex;
SensorIndex = arrSensor();
}
}
3) use for loop to store data to different text file using index
void CSkeletalViewerApp::Nui_DrawSkeleton( const NUI_SKELETON_DATA & skel, int windowWidth, int windowHeight )
{
int i;
int h;
for (h = 0; h < 2; h++)
{
//when index point to the current kinect
if (SensorIndex[h] == &m_pNuiSensor)
{
for (i = 0; i < NUI_SKELETON_POSITION_COUNT; i++)
{
m_Points[i] = SkeletonToScreen(skel.SkeletonPositions[i], windowWidth, windowHeight);
memset(mText, 0, 1024);
sprintf(mText, "(%0.3f,%0.3f,%0.3f)", skel.SkeletonPositions[i].x, skel.SkeletonPositions[i].y, skel.SkeletonPositions[i].z);
if (mp3DFile[h]) {
fputs((const char*)mText, mp3DFile[h]);
}
}
if (mp3DFile[h]) {
fputs("\n", mp3DFile[h]);
}
}
}
.
.
}
I am a newbie in this Kinect programming. Thank you very much for your help! :)
I'm very new to Arduino and C programming.
I'm making a GPS speedo and I'm trying to read in some serial, store a value from a substring and echo it back via serial.
At the moment I'm having problems storing the substring.
I've gotten to the point where I'm able to get some data between < and >.
But the data doesn't come in like that. It's a NMEA data stream and the data I want is between ,N, and ,K,.
So I've been trying to replace ,N, with < and ,K, with > .
Just can't get it to work. I get error: request for member 'replace' in 'c', which is of non-class type 'char'
Here's my code so far....
int indata = 0;
int scrubdata = 0;
char inString[32];
int stringPos = 0;
boolean startRead = false; // is reading?
void setup() {
Serial.begin(4800);
}
void loop() {
String pageValue = readPage();
Serial.print(pageValue);
}
String readPage(){
//read the page, and capture & return everything between '<' and '>'
stringPos = 0;
memset( &inString, 0, 32 ); //clear inString memory
while(true){
if (Serial.available() > 0) {
char c = Serial.read();
c.replace(",N,", "<");
c.replace(",K,", ">");
if (c == '<' ) { //'<' is our begining character
startRead = true; //Ready to start reading the part
}
else if(startRead){
if(c != '>'){ //'>' is our ending character
inString[stringPos] = c;
stringPos ++;
}
else{
//got what we need here! We can disconnect now
startRead = false;
return inString;
}
}
}
}
}
By Default:
Serial.read() returns an int if you must process the data this way, try casting it to char with:
char c = (char) Serial.read();
Another way to do this:
Would be to seek your beginning string (discarding un-needed data) using Serial.find() then reading data until you met your end character ",K," with Serial.readBytesUntil()
Something like this would work quite well:
char inData[64]; //adjust for your data size
Serial.setTimeout(2000); //Defaults to 1000 msecs set if necessary
Serial.find(",N,"); //Start of Data
int bRead = Serial.readBytesUntil(",K,", inData, 64); //Read until end of data
inData[bRead] = 0x00; //Zero terminate if using this as a string
return inData;