Programming Forums > Application Development > C++

Harakim · May 14th, 2006, 12:42 AM

This is a fairly petty problem, but I hope that someone here has experienced it as well.
I am trying to use zlib with my program in Visual Studio .NET 2003. I recently included the zlib1.dll version 1.2.3.0 with my program. I then included zlib.h and zconf.h of the same version in my visual studio include folder. I recieved errors:

(Toggle Plain Text)

void Client::start(void)
{
	//no errors here
	zip.zalloc = Z_NULL;
	zip.zfree = Z_NULL;
	zip.opaque = Z_NULL;
	zip.avail_in = 0;
	zip.next_in = Z_NULL;

	//errors here, because it is a function
	int ret = inflateInit(&zip);
	if (ret != Z_OK) {
		crash();
		return;
	}

	//this function contains the same error
             run();

	//errors here too
	inflateEnd(&zip);
}
------------------------------------------------
Client.obj : error LNK2019: unresolved external symbol _inflate referenced in function "private: int __cdecl Client::run(void *)" (?run@Client@@AAAHPAX@Z)
Client.obj : error LNK2019: unresolved external symbol _inflateEnd referenced in function "public: void __thiscall Client::start(void)" (?start@Client@@QAEXXZ)
Client.obj : error LNK2019: unresolved external symbol _inflateInit_ referenced in function "public: void __thiscall Client::start(void)" (?start@Client@@QAEXXZ)
Debug/Console Dev1.exe : fatal error LNK1120: 3 unresolved externals

I then included the entire zlib source in a subdirectory and #included it. I got the same errors.

After a lot of reading, I am wondering if I need to make a .lib file. I have a .def file but I don't know how to use lib because it doesn't work from my command line. I don't especially want to go to all that effort if there is one available or this is a simple problem.

niteice · May 14th, 2006, 1:04 AM

You might want to try:

(Toggle Plain Text)

extern "C"
{
#include "zlib.h"
};

and see if it might clean up any linkage errors.

Harakim · May 14th, 2006, 1:14 AM

thanks niteice

May 14th, 2006, 12:42 AM	#1
Harakim Hobbyist Programmer Join Date: May 2006 Location: West Jordan, Utah, United States Posts: 176 Rep Power: 3	zlib in Visual studio This is a fairly petty problem, but I hope that someone here has experienced it as well. I am trying to use zlib with my program in Visual Studio .NET 2003. I recently included the zlib1.dll version 1.2.3.0 with my program. I then included zlib.h and zconf.h of the same version in my visual studio include folder. I recieved errors: (Toggle Plain Text) void Client::start(void) { //no errors here zip.zalloc = Z_NULL; zip.zfree = Z_NULL; zip.opaque = Z_NULL; zip.avail_in = 0; zip.next_in = Z_NULL; //errors here, because it is a function int ret = inflateInit(&zip); if (ret != Z_OK) { crash(); return; } //this function contains the same error run(); //errors here too inflateEnd(&zip); } ------------------------------------------------ Client.obj : error LNK2019: unresolved external symbol _inflate referenced in function "private: int __cdecl Client::run(void )" (?run@Client@@AAAHPAX@Z) Client.obj : error LNK2019: unresolved external symbol _inflateEnd referenced in function "public: void __thiscall Client::start(void)" (?start@Client@@QAEXXZ) Client.obj : error LNK2019: unresolved external symbol _inflateInit_ referenced in function "public: void __thiscall Client::start(void)" (?start@Client@@QAEXXZ) Debug/Console Dev1.exe : fatal error LNK1120: 3 unresolved externals void Client::start(void) { //no errors here zip.zalloc = Z_NULL; zip.zfree = Z_NULL; zip.opaque = Z_NULL; zip.avail_in = 0; zip.next_in = Z_NULL; //errors here, because it is a function int ret = inflateInit(&zip); if (ret != Z_OK) { crash(); return; } //this function contains the same error run(); //errors here too inflateEnd(&zip); } ------------------------------------------------ Client.obj : error LNK2019: unresolved external symbol _inflate referenced in function "private: int __cdecl Client::run(void )" (?run@Client@@AAAHPAX@Z) Client.obj : error LNK2019: unresolved external symbol _inflateEnd referenced in function "public: void __thiscall Client::start(void)" (?start@Client@@QAEXXZ) Client.obj : error LNK2019: unresolved external symbol _inflateInit_ referenced in function "public: void __thiscall Client::start(void)" (?start@Client@@QAEXXZ) Debug/Console Dev1.exe : fatal error LNK1120: 3 unresolved externals I then included the entire zlib source in a subdirectory and #included it. I got the same errors. After a lot of reading, I am wondering if I need to make a .lib file. I have a .def file but I don't know how to use lib because it doesn't work from my command line. I don't especially want to go to all that effort if there is one available or this is a simple problem.

May 14th, 2006, 1:04 AM	#2
niteice Programmer Join Date: Aug 2005 Posts: 98 Rep Power: 4	You might want to try: (Toggle Plain Text) extern "C" { #include "zlib.h" }; extern "C" { #include "zlib.h" }; and see if it might clean up any linkage errors.

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May 14th, 2006, 1:14 AM	#3
Harakim Hobbyist Programmer Join Date: May 2006 Location: West Jordan, Utah, United States Posts: 176 Rep Power: 3	thanks niteice

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Programming Forums > Application Development > C++

zlib in Visual studio