C++ string获取文件路径文件名、文件路径、文件后缀（两种方式）

windows路径有两种方式，一种正斜杠，一种反斜杠都可以表示路径，该方法可以支持这两种表达方法

方法一：采用substr()进行分割

string path1 = "D:/datas/FusionTestData/datas/GF6_PMS_E111.2_N27.6_20180719_L1A1119837939-PAN.tiff"
string path2 = "D:\datas\FusionTestData\datas\GF6_PMS_E111.2_N27.6_20180719_L1A1119837939-PAN.tiff"

string::size_type iPos = (path1 .find_last_of('\\') + 1) == 0 ?  path1 .find_last_of('/') + 1: path1 .find_last_of('\\') + 1 ;
string ImgName = path1 .substr(iPos, path1 .length() - iPos);//获取带后缀的文件名
string ImgPath = path1 .substr(0,iPos);//获取文件路径
string ImgNameNoTag = ImgName.substr(0, ImgName.rfind("."));//获取不带后缀的文件名
string ImgNameTag = ImgName.substr(ImgName.rfind("."),ImgName.length());//获取后缀名

方法2：使用_splitpath()函数分割路径，_makepath()函数组合路径
使用样例：

#include
int main(){
	string path1 = "D:/datas/FusionTestData/datas/GF6_PMS_E111.2_N27.6_20180719_L1A1119837939-PAN.tiff";
	string path2 = "D:\datas\FusionTestData\datas\GF6_PMS_E111.2_N27.6_20180719_L1A1119837939-PAN.tiff";
	string path3 = "D:\\datas\\FusionTestData\\datas\\GF6_PMS_E111.2_N27.6_20180719_L1A1119837939-PAN.tiff";


	char orbitfilename[1024];

	char drive[_MAX_DRIVE];
	char dir[_MAX_DIR];
	char fname[_MAX_FNAME];
	char ext[_MAX_EXT];
	_splitpath(path1.c_str(), drive, dir, fname, ext);
	printf("drive:%s\n", drive);
	printf("dir:%s\n", dir);
	printf("fname:%s\n", fname);
	printf("ext:%s\n", ext);
	_makepath(orbitfilename, drive, dir, fname, "orbit");
	printf("orbitfilename:%s\n\n", orbitfilename);


	char orbitfilename2[1024];
	char drive2[_MAX_DRIVE];
	char dir2[_MAX_DIR];
	char fname2[_MAX_FNAME];
	char ext2[_MAX_EXT];
	_splitpath(path2.c_str(), drive2, dir2, fname2, ext2);
	printf("drive2:%s\n", drive2);
	printf("dir2:%s\n", dir2);
	printf("fname2:%s\n", fname2);
	printf("ext2:%s\n", ext2);
	_makepath(orbitfilename2, drive2, dir2, fname2, "test2");
	printf("orbitfilename2:%s\n\n", orbitfilename2);

	char orbitfilename3[1024];
	char drive3[_MAX_DRIVE];
	char dir3[_MAX_DIR];
	char fname3[_MAX_FNAME];
	char ext3[_MAX_EXT];
	_splitpath(path3.c_str(), drive3, dir3, fname3, ext3);
	printf("drive3:%s\n", drive3);
	printf("dir3:%s\n", dir3);
	printf("fname3:%s\n", fname3);
	printf("ext3:%s\n", ext3);
	_makepath(orbitfilename3, drive3, dir3, fname3, "test3");
	printf("orbitfilename3:%s\n\n", orbitfilename3);

	return 0;
	}

结果如下：
第二个路径是单反斜杠，有问题。改成双反斜杠也就OK了