uchar* to int

[Wojtek_SZ]

Hello,

How can I convert unsigned char* to int in Qt?

[Santosh Reddy]

one simple way
char* str = "2012";
int num = QString::fromLocal8Bit(str).toInt();

[Wojtek_SZ]

Thanks for reply, but Qt says "argument of type "uchar*" is incompatibile with parametr of "const uchar*""
What can I do with my uchar*?

[wyjyan]

Yo

unsigned char *ptr = (unsigned char*)"S";
int num = (int)*ptr;

print ptr & num

[spirit]

See QString::toInt.

Yo

unsigned char *ptr = (unsigned char*)"S";
int num = (int)*ptr;

print ptr & num

I'm pretty sure that better to use C++ casting than C ones.

[Wojtek_SZ]

I totally agree so I used:

uchar *poczatek;
poczatek = obraz.bits();
const char *adres = reinterpret_cast<const char*>(poczatek);
int j = QString::fromLocal8Bit(adres).toInt();

but I don't know why j = 0
both pointers as well...

[spirit]

Lets clarify: what are you going to achieve? Do you need to convert a number which contains in a string (e.g. "12" => 12) or what?

[Wojtek_SZ]

Sorry

I'm trying to

get adres of first pixel of obraz image so I could use j
as a starting point in loop:

for(int i = j; i <= obraz.height(); i++){
		int licznik = 0;
		for(int k = 1; k <= obraz.width(); k++){
			QRgb tempColorRgb = obraz.pixel(k,i);
			QColor tempColor = QColor(tempColorRgb);
			wektor[i * obraz.width() + k + licznik] = tempColor.red(); 
			licznik++;
			wektor[i * obraz.width() + k + licznik] = tempColor.green();
			licznik++;
			wektor[i * obraz.width() + k + licznik] = tempColor.blue();
			if (k == obraz.width())
				k = 1;
               }
}

for(int i = j; i <= obraz.height(); i++){
		int licznik = 0;
		for(int k = 1; k <= obraz.width(); k++){
			QRgb tempColorRgb = obraz.pixel(k,i);
			QColor tempColor = QColor(tempColorRgb);
			wektor[i * obraz.width() + k + licznik] = tempColor.red(); 
			licznik++;
			wektor[i * obraz.width() + k + licznik] = tempColor.green();
			licznik++;
			wektor[i * obraz.width() + k + licznik] = tempColor.blue();
			if (k == obraz.width())
				k = 1;
               }
}

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[spirit]

And you want to do...?

[Wojtek_SZ]

Hello,


I've been very busy recently, I would like to back to my post:
I would like to send as a parrameter to my assembler function adress of first red data (each pixel of obraz image is split to RGB)
In order to achive this I have to convert uchar to int

void PROJ_ASM_SEPIA::odcien_szarosci_sl()
{
//	int *wektor = new int[obraz.height()*obraz.width()*3];
	uchar *poczatek; 
	poczatek = obraz.bits();                                                           //getting adress of first pixel in image obraz (uchar)
	const char *adres = reinterpret_cast<const char*>(poczatek);       //convertion to const char
	int j = QString::fromLocal8Bit(adres).toInt();                                //convertion char to int
 
            for(int i = j; i <= obraz.height(); i++){                                   //adres of first pixel (j) as a starting point of the loop
                  int licznik = 0;
                  for(int k = 1; k <= obraz.width(); k++){                                    //every pixel is split to RGB data - red green blue  - data is stored in wektor
                         QRgb tempColorRgb = obraz.pixel(k,i);
                         QColor tempColor = QColor(tempColorRgb);
                         wektor[i * obraz.width() + k + licznik] = tempColor.red();
                         licznik++;
                         wektor[i * obraz.width() + k + licznik] = tempColor.green();
                         licznik++;
                         wektor[i * obraz.width() + k + licznik] = tempColor.blue();
                         if (k == obraz.width())
                               k = 1;
                }
         }
 
 
	odcien_szar(wektor[0],obraz.width(),obraz.height());                                       //assembler function calling with adress of first data (red of first pixel)                           
}

void PROJ_ASM_SEPIA::odcien_szarosci_sl()
{
//	int *wektor = new int[obraz.height()*obraz.width()*3];
	uchar *poczatek; 
	poczatek = obraz.bits();                                                           //getting adress of first pixel in image obraz (uchar)
	const char *adres = reinterpret_cast<const char*>(poczatek);       //convertion to const char
	int j = QString::fromLocal8Bit(adres).toInt();                                //convertion char to int

            for(int i = j; i <= obraz.height(); i++){                                   //adres of first pixel (j) as a starting point of the loop
                  int licznik = 0;
                  for(int k = 1; k <= obraz.width(); k++){                                    //every pixel is split to RGB data - red green blue  - data is stored in wektor
                         QRgb tempColorRgb = obraz.pixel(k,i);
                         QColor tempColor = QColor(tempColorRgb);
                         wektor[i * obraz.width() + k + licznik] = tempColor.red();
                         licznik++;
                         wektor[i * obraz.width() + k + licznik] = tempColor.green();
                         licznik++;
                         wektor[i * obraz.width() + k + licznik] = tempColor.blue();
                         if (k == obraz.width())
                               k = 1;
                }
         }


	odcien_szar(wektor[0],obraz.width(),obraz.height());                                       //assembler function calling with adress of first data (red of first pixel)                           
}

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The point is that the assembler function (gray scale) get adress of first pixel to make some calculations over rest of pixels.

[Lesiok]

Show the definition of the function odcien_szar

[wysota]

odcien_szar((int)wektor[0],obraz.width(),obraz.height());

odcien_szar((int)wektor[0],obraz.width(),obraz.height());

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provided that wektor[0] is the address you want to pass to odcien_szar. Note that your odcien_szar function should take a uchar* and not an int, though. sizeof(int) doesn't have to be equal to sizeof(uchar*).