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本文介绍一下 C 和 C++ 读取和保存 bin 文件的方法。
bin
文件的存取在调试网络推理定位问题的时候可能会经常用到，如在这个框架里网络输出和预期对不上，经常需要把这个网络里的前处理输出、网络推理输出搬到另外的框架里走一遍，来确定是前处理有问题，还是网络推理有问题，还是后处理有问题。这里分享一下
C 语言和 C++ 读取和保存特征数据为 bin 文件的方法。其实大部分情况可以用 C++ 搞定，但如 darknet 这种纯 C 框架可能就需要用 C
实现。文章目录
1、C 读取和保存 bin 文件
1.1 C 读取
1.2 C 保存
1.3 C 调用
2、C++ 读取和保存 bin 文件
2.1 C++ 读取
2.2 C++ 保存
2.3 C++ 调用
1、C 读取和保存 bin 文件
1.1 C 读取
/// C 读取bin文件
int getBinSize(char *path) { int size = 0; FILE *fp = fopen(path,
"rb"); if (fp) { fseek(fp, 0, SEEK_END); size =
ftell(fp); fclose(fp); } printf("\npath=%s,size=%d \n", path,
size); return size; } void readBin(char *path, char *buf, int size) {
FILE *infile; if ((infile = fopen(path, "rb")) == NULL) {
printf("\nCan not open the path: %s \n", path); exit(-1); }
fread(buf, sizeof(char), size, infile); fclose(infile); }
1.2 C 保存
/// C 保存bin文件
void writeBin(char *path, char *buf, int size) { FILE *outfile; if
((outfile = fopen(path, "wb")) == NULL) { printf("\nCan not open
the path: %s \n", path); exit(-1); } fwrite(buf, sizeof(char),
size, outfile); fclose(outfile); }
1.3 C 调用
// read binFile char filePath[] = "./demo.bin"; int size =
GetBinSize(filePath); char *buf = (char*)malloc(size); readBin(filePath, buf,
size); float *fbuf = (float*)buf; // write binFile char saveFilePath[] =
"./demo_saved.bin" writeBin(saveFilePath, buf, size) free(buf)
2、C++ 读取和保存 bin 文件
2.1 C++ 读取
/// C++ 读取bin文件 void getBinSize(std::string path) { int size = 0;
std::ifstream infile(path, std::ifstream::binary); infile.seekg(0,
infile.end); int size= infile.tellg(); infile.seekg(0, infile.beg);
infile.close(); printf("\npath=%s,size=%d \n", path, size);
return size; } void readBin(std::string path, char *buf, int size) {
std::ifstream infile(path, std::ifstream::binary);
infile.read(static_cast<char *>(buf), size); infile.close(); }
2.2 C++ 保存
/// C++ 保存bin文件 void writeBin(std::string path, char *buf, int size) {
std::ofstream outfile(path, std::ifstream::binary); outfile.write((char
*)(buf), size); outfile.close(); }
2.3 C++ 调用
// read binFile std::string filePath= "./demo.bin"; int size =
GetBinSize(filePath); char *buf= new char[size]; readBin(filePath, buf, size);
float *fbuf = reinterpret_cast<float *>(buf); // write binFile std::string
saveFilePath= "./demo_saved.bin"; writeBin(saveFilePath, buf, size); delete buf;
2. 文件读出成char
//C方式, 调用的函数繁多 //fopen,fseek,ftell,fseek,malloc,fread,fclose,free. void foo()
{ FILE* fp=fopen(sFileName,"rb"); fseek(fp,0,SEEK_END); int len = ftell(fp);
fseek(fp,0,SEEK_SET); char* s = (char*)malloc(len); fread(s,1,len,fp);
fclose(fp); fwrite(s,1,len,stdout);//output free(s); } //C++方式，易懂 void foo() {
ifstream fs(sFileName.c_str(),ios::binary); stringstream ss ; ss << fs.rdbuf();
fs.close(); string str = ss.str();//read into string } //C++方式，高大上
//string的构造用了一个模版函数 void foo() { std::ifstream ifs(sFileName.c_str());
std::string str((std::istreambuf_iterator<char>(ifs)),
std::istreambuf_iterator<char>(0)); ifs.close(); }