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Converting a char* into an int


Converting a char* into an int

By : swapon
Date : November 18 2020, 11:13 AM
Hope this helps I'm currently trying to convert an integer into a char* in order to send it over a socket. In the receiving method I logically try to treat the char* as an integer again, but I seem to be missing something because I can't get it right. , You could do it like this:
code :
//to a char*
char *P2 = static_cast<char *>((void*)Tst);
//from a char *
int *S1 = static_cast<int *>((void *)P2);
int Data[4] ={42,100,126,517};
char *C1 = static_cast<char*>((void*)Data);
send(socket,C1, sizeof(int[4]),NULL);
struct dataBlock
{
char ID[20];
int R1;
int R2;
int R3;
int R4;
};
...
dataBlock Data = {"test\0", 57,100,127,156};
char *Buff = static_cast<char*>((void*)&Data);
send(socket, Buff, sizeof(dataBlock), 0);
char *Buff = new char[sizeof(dataBlock)];
recv(socket, Buff, sizeof(dataBlock),0);
dataBlock * Data = static_cast<dataBlock*>((void*)Buff);


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Appengine converting unicode char to blank char in urllib.unquote

Appengine converting unicode char to blank char in urllib.unquote


By : user3703230
Date : March 29 2020, 07:55 AM
it helps some times What you are sending appears to be the result of url-encoding some characters expressed in cp1254 (Windows Turkish) encoding (or the very similar ISO-8859-9 encoding). Have you told "appengine" what encoding you are using?
We need a bit more information about "Still unicode chars like "İşÇöÖü" are blank". Blank when you look at them how? Instead of
code :
request_data = self.request.get('mdata')
htmldata = urllib.unquote_plus(request_data)
Explain: Converting 'char **' to 'const char **', Conversion loses qualifiers

Explain: Converting 'char **' to 'const char **', Conversion loses qualifiers


By : kmartin
Date : March 29 2020, 07:55 AM
may help you . Yes, you cannot implicitly convert from a T ** to a const T **, because the compiler can no longer guarantee that the const-ness won't be violated.
Consider the following code (borrowed from the C FAQ question on exactly this topic: Why can't I pass a char ** to a function which expects a const char **?):
code :
const char c = 'x';
char *p1;
const char **p2 = &p1;  // 3
*p2 = &c;
*p1 = 'X';              // 5
Converting a lowercase char in a char array to an uppercase char (java)

Converting a lowercase char in a char array to an uppercase char (java)


By : user6228102
Date : March 29 2020, 07:55 AM
may help you . I would do it this way. First check if the character is a letter and if it is lowercase. After this just use the Character.toUpperCase(char ch)
code :
if(Character.isLetter(charmessage[counter]) && Character.isLowerCase(charmessage[counter])){
    charmessage[counter] = Character.toUpperCase(charmessage[counter]);
}
Converting a char array into an structure similar to int argc and char** argv

Converting a char array into an structure similar to int argc and char** argv


By : GDeshp11
Date : March 29 2020, 07:55 AM
hope this fix your issue I have read a text line from a file, and I need to convert it to an structure similar to main function arguments. For example if the char array is char* text="There are books in the library." and I have below structure definition: , You could use strtok to do this split, like this:
code :
struct split_result {
    int cnt;
    char *buf;
    char **strs;
};

int
split(const char *str, struct split_result *rst)
{
    int idx, str_num;
    char *buf, *sep, **strs;

    buf = strdup(str);
    if (buf == NULL) {
        perror("strdup");
        return -1;
    }

    str_num = 1;
    strs = malloc(str_num * sizeof(char *));
    if (strs == NULL) {
        perror("malloc");
        return -1;
    }

    sep = " \t";
    idx = 0;
    for (strs[idx] = strtok(buf, sep);
         strs[idx];
         strs[idx] = strtok(NULL, sep))
    {
        idx++;
        if (idx >= str_num) {
            str_num += 10;
            strs = realloc(strs, str_num * sizeof(char *));
            if (strs == NULL) {
                perror("realloc");
                return -1;
            }
        }
    }

    rst->cnt = idx;
    rst->strs = strs;
    rst->buf = buf;

    return 0;
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct split_result {
    int cnt;
    char *buf;
    char **strs;
};

int
split(const char *str, struct split_result *rst)
{
    int idx, str_num;
    char *buf, *sep, **strs;

    buf = strdup(str);
    if (buf == NULL) {
        perror("strdup");
        return -1;
    }

    str_num = 1;
    strs = malloc(str_num * sizeof(char *));
    if (strs == NULL) {
        perror("malloc");
        return -1;
    }

    sep = " \t";
    idx = 0;
    for (strs[idx] = strtok(buf, sep);
         strs[idx];
         strs[idx] = strtok(NULL, sep))
    {
        idx++;
        if (idx >= str_num) {
            str_num += 10;
            strs = realloc(strs, str_num * sizeof(char *));
            if (strs == NULL) {
                perror("realloc");
                return -1;
            }
        }
    }

    rst->cnt = idx;
    rst->strs = strs;
    rst->buf = buf;

    return 0;
}

int
main(void)
{
    int i, j;
    struct split_result rst;
    const char *msg[] = {
        "",
        " One",
        " One  Two",
        " One  Two Tree  ",
        "There are books in the library.",
        NULL,
    };

    for (i = 0; msg[i]; i++) {
        if (split(msg[i], &rst) < 0) {
            exit(EXIT_FAILURE);
        }

        printf("msg[%d] = >>%s<<\n", i, msg[i]);
        for (j = 0; j < rst.cnt; j++) {
            printf("cnt = %d: |%s|\n", j, rst.strs[j]);
        }

        free(rst.strs);
        free(rst.buf);
    }

    exit(EXIT_SUCCESS);
}
$ ./a.out 
msg[0] = >><<
msg[1] = >> One<<
cnt = 0: |One|
msg[2] = >> One  Two<<
cnt = 0: |One|
cnt = 1: |Two|
msg[3] = >> One  Two Tree  <<
cnt = 0: |One|
cnt = 1: |Two|
cnt = 2: |Tree|
msg[4] = >>There are books in the library.<<
cnt = 0: |There|
cnt = 1: |are|
cnt = 2: |books|
cnt = 3: |in|
cnt = 4: |the|
cnt = 5: |library.|
Converting char* to int and converting back to the same char array

Converting char* to int and converting back to the same char array


By : Mrugesh Maisuriya
Date : March 29 2020, 07:55 AM
wish of those help By default, compiler treats string literals as immutable, and an attempt to modify the contents of one results in an access violation error at run time because these strings are put into code segment, and it's read only. In your case, TESTING is a string literal, you can't not change its values. Try:
code :
 char port[] = "5002";
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