[Linker fatal error] fatal: Unable to open file 'graphics.obj'

[szwxj]

我使用BCB6编写图像转换程序，编译通过，连接出现错误，如何解决？

[szwxj]

EXE没有问题，DLL就出现上述问题，以前也做过类似的东东，没有问题呀？

[constantine]

信息太少了

[szwxj]

创建一个DLL工程，编写两个输出的函数
源程序如下：

//---------------------------------------------------------------------------

#include <vcl.h>
#include <windows.h>
#include <jpeg.hpp>
#include <graphics.hpp>
#pragma hdrstop
//---------------------------------------------------------------------------
// Important note about DLL memory management when your DLL uses the
// static version of the RunTime Library:
//
// If your DLL exports any functions that pass String objects (or structs/
// classes containing nested Strings) as parameter or function results,
// you will need to add the library MEMMGR.LIB to both the DLL project and
// any other projects that use the DLL. You will also need to use MEMMGR.LIB
// if any other projects which use the DLL will be performing new or delete
// operations on any non-TObject-derived classes which are exported from the
// DLL. Adding MEMMGR.LIB to your project will change the DLL and its calling
// EXE's to use the BORLNDMM.DLL as their memory manager. In these cases,
// the file BORLNDMM.DLL should be deployed along with your DLL.
//
// To avoid using BORLNDMM.DLL, pass string information using "char *" or
// ShortString parameters.
//
// If your DLL uses the dynamic version of the RTL, you do not need to
// explicitly add MEMMGR.LIB as this will be done implicitly for you
//---------------------------------------------------------------------------

extern "C" __stdcall __declspec(dllexport) bool PASCAL wxjBmpToJpg(char* bmpfile,char* jpgfile,int compress);
extern "C" __stdcall __declspec(dllexport) bool PASCAL wxjJpgToBmp(char* jpgfile,char* bmpfile);



#pragma argsused
int WINAPI DllEntryPoint(HINSTANCE hinst, unsigned long reason, void* lpReserved)
{
return 1;
}
//---------------------------------------------------------------------------





bool __fastcall BmpToJpg(AnsiString bmpfile, AnsiString jpgfile, int compress)
{
//TODO: Add your source code here
TJPEGImage* jpg;
Graphics::TBitmap * bmp ;
bool b ;


try
{
jpg = new Jpeg::TJPEGImage();
bmp = new Graphics::TBitmap();
b = true;
try
{
bmp->LoadFromFile(bmpfile);
jpg->Assign(bmp);
jpg->CompressionQuality = compress ;
jpg->Compress();
jpg->SaveToFile(jpgfile);
}
__finally
{
bmp->Free();
jpg->Free();
}
}
catch(...)
{
b = false;
}

return b;
}

bool __fastcall JpgToBmp(AnsiString jpgfile, AnsiString bmpfile)
{
//TODO: Add your source code here
Jpeg::TJPEGImage* jpg;
Graphics::TBitmap * bmp ;
bool b ;


try
{
jpg = new Jpeg::TJPEGImage();
bmp = new Graphics::TBitmap();
b = true;
try
{
jpg->LoadFromFile(jpgfile);
bmp->Assign(jpg);
bmp->SaveToFile(bmpfile);
}
__finally
{
bmp->Free();
jpg->Free();
}
}
catch(...)
{
b = false;
}

return b;
}




__declspec(dllexport) bool PASCAL wxjBmpToJpg(char* bmpfile,char* jpgfile,int compress)
{
return BmpToJpg(bmpfile,jpgfile,compress);
}


__declspec(dllexport) bool PASCAL wxjJpgToBmp(char* jpgfile,char* bmpfile)
{
return JpgToBmp(jpgfile,bmpfile);
}


编译没有问题，连接出现上述错误！我使用的是完全发行方式编译。

[cczlp]

http://community.csdn.net/Expert/topic/3256/3256837.xml?temp=.4853937

[szwxj]

解决了，但是什么原因，有没有大侠能够说清楚其中的道道？
解决办法是：
新增加一个UNIT，在头文件中包括


#include <Graphics.hpp>

不要放在 .cpp 中，而是放在 .h 中。


奇怪吧！但谁能够说清楚是什么原因，郁闷。

[constantine]

这个...
好象很久以前我也遇到过，当初在做图象处理的dll
也不太清楚怎么
或许JSP知道