Difficulty in setting OpenBLAS libraries in visual studio

[oyster li]

Hello,

I try to use the OpenBLAS library in Visual Studio 2008 with the x64 computer and Win7 OS.

And, the project of the program is on the x86 platform.

So, I download the "mingw64_dll.zip" and "OpenBLAS-v0.2.14-Win64-int32.zip". on the site "http://sourceforge.net/projects/openblas/files/v0.2.14/".

Refering to the sites "https://github.com/xianyi/OpenBLAS/wiki/How-to-use-OpenBLAS-in-Microsoft-Visual-Studio"
and "https://groups.google.com/forum/#!topic/openblas-users/YBfetRdPRlk", I take "libopenblas.dll.a" as lib, "libopenblas.dll' as bin,.
Copy the dlls "libgcc_s_seh-1.dll", "libgfortran-3.dll" and "libquadmath-0.dll" from the folder "mingw64_dll" to "OpenBLAS-v0.2.14-Win64-int32\bin".

Add the bin path to the system path and restart the computer.
Add the include path and lib path in the VS2008.
Add the file "libopenblas.dll.a" in the Linker ->Input->Additional Dependencies.

Finally, I can compile the program successfully with #include <cblas.h> and no code in the main.

Strangely, when I call the function from "cblas.h", it fails with the error "error LNK2019: unresolved external symbol _cblas_dgemm in the method _main".

I know this might be a silly question, but could anybody give me an easy explanation?

Thanks

[oyster li]

Compiled Result 

[oyster li]

The testing code is here.

 

#include <cblas.h>

#include <stdio.h>

void main()

{

  int i=0;

  double A[6] = {1.0,2.0,1.0,-3.0,4.0,-1.0};         

  double B[6] = {1.0,2.0,1.0,-3.0,4.0,-1.0};  

  double C[9] = {.5,.5,.5,.5,.5,.5,.5,.5,.5}; 

  cblas_dgemm(CblasColMajor, CblasNoTrans, CblasTrans,3,3,2,1,A, 3, B, 3,2,C,3);

  for(i=0; i<9; i++)

    printf("%lf ", C[i]);

  printf("\n");

} 

[Zhang Xianyi]

Hi ,

The library is for x64 and your project is win32. Therefore, it cannot find the library.

Please change your project to x64 or download OpenBLAS win32 binary.

Xianyi

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[oyster li]

Hi,  

I try to change the dll from "mingw64_dll" to "mingw32_dll", and the main library is "OpenBLAS-v0.2.14-Win64-int32".

.

It is still the same error "error LNK2019: unresolved external symbol _cblas_dgemm in the method _main".
Next, I try to use the "OpenBLAS-v0.2.15-Win32" wtih "mingw32_dll" and "OpenBLAS-v0.2.15-Win32" with "mingw32_dll".
Successfully compile , but i receive another error "The application was unable to start correctly (0xc00007b)".
According to the site "https://github.com/xianyi/OpenBLAS/wiki/How-to-use-OpenBLAS-in-Microsoft-Visual-Studio",
it typically indicates a mismatch between 32/64-bit libraries.
And, my visual studio is x86, so i couldnt change the platform from x86 to x64.
Is it true that only few people use the openBLAS lib in visual studio, so that i could not find any tutorial step by step in detail.

Oyster Li