C++ 遇到error LNK2019: unresolved external symbol "public: void __thisca的问题

最新推荐文章于 2020-09-08 11:17:10 发布

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本文介绍了解决LNK2028错误的方法，该错误通常出现在链接过程中，当编译器无法找到特定方法的实现时发生。通过提供一个具体的示例，即在ImageVolume类中实现readVolume方法，解决了未解析外部符号的问题。

1>main.obj : error LNK2028: unresolved token (0A00032D) "public: void __thiscall ImageVolume::readVolume(unsigned char *,char const *,long)" (?readVolume@ImageVolume@@$$FQAEXPAEPBDJ@Z) referenced in function "int __cdecl main(void)" (?main@@$$HYAHXZ)
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall ImageVolume::readVolume(unsigned char *,char const *,long)" (?readVolume@ImageVolume@@$$FQAEXPAEPBDJ@Z) referenced in function "int __cdecl main(void)" (?main@@$$HYAHXZ)

解决方案：在方法的。cpp里面加上 ImageVolume:: getlength()

void ImageVolume::readVolume(u_char * buf,char const *filename,int length)
{
	FILE *file=fopen(filename,"rb");
	//u_char * buf;
	if(file==NULL)
	{
		printf("open the file failed!");
	}
	fread(buf,sizeof(unsigned char),length,file);
	fclose(file);
	printf("read is ok");
}