char* 类型的常量，所以不能用ptr来修改所指向的内容，换句话说，*ptr的值为const，不能修改。但是ptr的声明并不意味着它指向的值实际上就是一个常量，而只是意味着对ptr而言，这个值是常量。实验如下：ptr指向str，而str不是const，可以直接通过str变量来修改str的值，但是确不能通过ptr指针来修改。
我们使用的 STL 就是 Standard Template Library 的缩写，但是在很多情况下，开发者都对其敬而远之，有...
const uint8_t GetCpuPercentByProcessName(const std::string& name) { HQUERY query; HCOUNTER cpuCounter; PDH_STATUS status = PdhOpenQuery(NULL, NULL, &query); if (status != ERROR_SUCCESS) std::cout 你的代码实现了一个函数GetCpuPercentByProcessName,用于获取指定进程的 CPU 使用率。下面是对这...
50 | void beginSSL(const char * host, uint16_t port, const char * url = "/", const uint8_t * fingerprint = NULL, const char * protocol = "arduino"); | ^ exit status 1 invalid conversion from 'const char*' to 'const uint8_t*' {aka 'const unsigned char*'} [-fpermissive] ...
Re: ESP32-A2DP Problem understanding the use of 'const uint8_t*' by Craige Hales » Sat Sep 10, 2022 7:09 pm You wrote this callback: Code: Select all void avrc_metadata_callback(uint8_t data1, const uint8_t *data2) { and the library calls it like this: Code: Select...
转换后也不能修改uint的值：它是const的。
tasmota/xsns_78_ezo.ino:56:24: error: invalid conversion from 'char*' to 'const uint8_t* {aka const unsigned char*}' [-fpermissive] Wire.write(cmd, len); EXPECTED BEHAVIOUR Compiles without error. SCREENSHOTS ADDITIONAL CONTEXT (Please, remember to close the issue when the problem has ...
voidXMU565(constuint8_t*pArray )noexcept; Parameters pArray Three element character array containing the values used to initialize the x-, y- and z-components of a new instance of XMU565. Return value None Remarks Array elements and the_wargument are mapped to the vec...
uint16_tf(constuint8_t*bytes){ifconstexpr(std::endian::native==std::endian::little){returnbytes[0]+bytes[1]*256;}else{returnbytes[1]+byte[0]*256;// compile error}}uint16_tg(constuint8_t*bytes){#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__returnbytes[0]+bytes[1]*256;#else...
uint8_tflag=1; voidtest(void) { while(flag) { //do something } } //interrupt service routine voidisr_test(void) { flag=0; } 如果没使用volatile定义flag,可能在优化后test陷入死循环,因为test里使用的flag并没修改它,开启优化后,编译器可能会固定从某个内存取值。例如: ...