OLED_ShowString(2,0,"Hongwai:",9);报错warning:passing 'char[9]'to parameter of type'unsigned char *'converts between point
时间: 2024-02-02 14:05:34 浏览: 277
这个问题可能是因为函数`OLED_ShowString`的第三个参数需要一个`unsigned char *`类型的指针,而你传递了一个`char[9]`类型的数组。
要解决这个问题,你可以尝试将数组转换为指针,或者将数组声明为`unsigned char`类型。
以下是两种可能的解决方法:
方法1:将数组转换为指针
```cpp
char text[] = "Hongwai:";
OLED_ShowString(2, 0, (unsigned char *)text, 9);
```
方法2:将数组声明为`unsigned char`类型
```cpp
unsigned char text[] = "Hongwai:";
OLED_ShowString(2, 0, text, 9);
```
通过以上两种方法,你应该能够解决这个警告问题。记得在实际使用时确认参数的正确性以及其他相关代码的正确性。
相关问题
server.c:438:12: warning: passing argument 1 of ‘strcpy’ from incompatible pointer type [-Wincompatible-pointer-types] 438 | strcpy(&message_crc, RecvInfo.header.crc32); | ^~~~~~~~~~~~ | | | uint32_t * {aka unsigned int *} In file included from server.h:9, from server.c:1: /usr/include/string.h:122:14: note: expected ‘char * restrict’ but argument is of type ‘uint32_t *’ {aka ‘unsigned int *’} 122 | extern char *strcpy (char *__restrict __dest, const char *__restrict __src) | ^~~~~~ server.c:438:41: warning: passing argument 2 of ‘strcpy’ makes pointer from integer without a cast [-Wint-conversion] 438 | strcpy(&message_crc, RecvInfo.header.crc32); | ~~~~~~~~~~~~~~~^~~~~~ | | | uint32_t {aka unsigned int}
这个警告是由于在调用`strcpy`函数时,传递了不兼容的指针类型作为参数。`strcpy`函数期望的第一个参数是一个指向字符的指针,而不是一个指向`uint32_t`(无符号整数)的指针。
要解决这个问题,你需要使用合适的类型转换来将`RecvInfo.header.crc32`转换为字符指针类型。你可以使用`(char *)`来进行强制类型转换。例如:
```c
strcpy((char *)&message_crc, (char *)&RecvInfo.header.crc32);
```
这样可以将`message_crc`和`RecvInfo.header.crc32`都转换为字符指针类型,并且不会触发警告。请确保在进行类型转换时,目标指针指向足够的内存空间来存储源指针所指向的内容。
Convert unsigned char array to hex string
Here's an example C++ code that converts an unsigned char array to a hex string:
```c++
#include <sstream>
#include <iomanip>
std::string to_hex_string(unsigned char* data, size_t len)
{
std::stringstream ss;
ss << std::hex << std::setfill('0');
for (size_t i = 0; i < len; ++i)
ss << std::setw(2) << static_cast<unsigned int>(data[i]);
return ss.str();
}
```
You can call this function by passing the unsigned char array and its length as arguments. The function returns the hex string representation of the array. Here's an example usage:
```c++
unsigned char data[] = { 0x12, 0x34, 0x56, 0x78 };
std::string hex_str = to_hex_string(data, sizeof(data));
std::cout << hex_str << std::endl; // Output: "12345678"
```
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