fwrite string
Firstly, std::string::size() does not account for the NUL character, so your binary file will not contain that. Your strategy for serializing is fine (size ..., sizeof(e->name) returns the size of the pointer (typically 4 or 8). Use strlen(e->name) to get the length of the string. Assuming the string in null ...
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 fwrite string 相關參考資料
freadfwrite string in C - Stack Overflow
I see two problems with the write, you are setting record.nameLength to be too small, and you are passing the wrong pointer to fwrite for the ... https://stackoverflow.com C++ fwrite and fread for string - Stack Overflow
Firstly, std::string::size() does not account for the NUL character, so your binary file will not contain that. Your strategy for serializing is fine (size ... https://stackoverflow.com How to write string member of structure to file using fwrite ...
sizeof(e->name) returns the size of the pointer (typically 4 or 8). Use strlen(e->name) to get the length of the string. Assuming the string in null ... https://stackoverflow.com How do I fwrite and fread array of strings to file? - Stack Overflow
You only write the address of variable c to file ' test ' (by function fwrite(c,sizeof...) ). Why don't you write the value into the file? https://stackoverflow.com fwrite, but to string instead of file in C - Stack Overflow
Under the hood, it seems your pointer p is just a big array of bytes. You can cast it to a char array and use it: char *jpegframe = (char *) p;. https://stackoverflow.com fwrite把string类型的信息写到文件，出现的问题....-CSDN论坛
我写了一个类例如： class A public: string str; int x; }; int main() A* pA = new A(); pA->str = "sdjfksldjf"; pA->x = 100; FILE* fp = fopen( "sd", "w" ); fwrite( pA, sizeof... https://bbs.csdn.net C++ std::string 使用fwrite及fread - 某K的程式學習嘴砲集中營
C++ std::string 使用fwrite及fread. 此方法不一定是最好的方法，僅為個人紀錄用， 如有更好的方法還請多指教，謝謝。 因為小弟對C++ fstream概念 ... http://kenazprogramming.blogsp fwrite() - C語言庫函數- C語言標準庫 - 極客書
C庫函數size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)寫入數據從數組ptr 指向給定流。 聲明以下是fwrite()函數的聲明。 size_t fwrite ( const ... http://tw.gitbook.net [ C ] 開檔、寫檔fopen() fwrite() - S's Journal - 痞客邦
[ C ] 開檔、寫檔fopen() fwrite() ... 寫檔: 使用stdio.h的fwrite()函數將array或是struct的內容寫入檔案中，第一個參數為array或 ... #include <string.h> https://style77125tech.pixnet. fwrite - C++ Reference - cplusplus.com
size_t fwrite ( const void * ptr, size_t size, size_t count, FILE * stream );. Write block of data to stream. Writes an array of count elements, each one with a size of ... http://www.cplusplus.com |