英文:
Qt: Shared C Library Exported From Golang
问题
我正在为您翻译以下内容：
我正在使用Golang导出可以在C中使用的共享库进行一些测试，并得出以下结果：
calcLib.go:
package main
import "C"
//export Calculator
func Calculator(x int, y int) int {
return x+y;
}
func main() {
// Need a main function to make CGO compile package as C shared library
}
这个简单的库包含了一个名为Calculator的函数，用于求和。现在我有一个小的C程序将使用它：
calc.c:
#include <stdio.h>
#include "calcLib.h"
int main() {
printf("Hello World from C!\n");
printf("Calculator() -> %d\n", Calculator(10,5));
return 0;
}
现在我可以使用以下命令编译库和C程序：
C:\Users\TCB13\Desktop
> go build -buildmode c-shared -o calcLib.a calcLib.go
C:\Users\TCB13\Desktop
> gcc -o calc.exe calc.c calcLib.a
这将输出一个正常工作的可执行文件：
> .\calc.exe
Hello World from C!
Calculator() -> 15
现在，我该如何在Qt项目中使用这个共享库？
我尝试在我的.pro文件中添加以下内容：
LIBS += -L"C:\Users\TCB13\shared\calcLib.a"
INCLUDEPATH += "C:\Users\TCB13\shared" # Shared folder includes the calcLib.h file
然后在我的main.cpp中：
#include "testapp.h"
#include <QApplication>
#include <QtDebug>
#include "calcLib.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
TestApp w;
w.show();
qDebug() << Calculator(10,5);
return a.exec();
}
编译这个项目会产生以下错误：
我该如何正确地在Qt应用程序中制作/导出/使用这个库？
这是我的calcLib.h文件供参考：https://pastebin.com/k3sKYiti
谢谢。
英文:
I was doing some tests with Golang exporting shared libraries that can be used in C and came up with the following:
calcLib.go:
package main
import "C"
//export Calculator
func Calculator(x int, y int) int {
return x+y;
}
func main() {
// Need a main function to make CGO compile package as C shared library
}
This simple library contains the Calculator that sums numbers. Now I've a small C program that will use it:
calc.c:
#include "calcLib.h"
int main() {
printf("Hello World from C!\n");
printf("Calculator() -> %d\n", Calculator(10,5));
return 0;
}
Now I can compile the library and the C program with:
C:\Users\TCB13\Desktop
> go build -buildmode c-shared -o calcLib.a calcLib.go
C:\Users\TCB13\Desktop
> gcc -o calc.exe calc.c calcLib.a
This will output an executable that works as expected:
> .\calc.exe
Hello World from C!
Calculator() -> 15
Now, how can I use this shared library in a Qt project?
I tried to add the following to my .pro file:
LIBS += -L"C:\Users\TCB13\shared\calcLib.a"
INCLUDEPATH += "C:\Users\TCB13\shared" # Shared folder includes the calcLib.h file
Then in my main.cpp:
#include "testapp.h"
#include <QApplication>
#include <QtDebug>
#include "calcLib.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
TestApp w;
w.show();
qDebug() << Calculator(10,5);
return a.exec();
}
Compiling this results in the following errors:
How can I properly make/export/use this library in a Qt Application?
Here is my calcLib.h file for reference: https://pastebin.com/k3sKYiti
Thank you.
答案1
得分: 1
在qmake项目文件中，LIBS变量使用与gcc链接器相同的命令行选项，-L用于指定库的搜索路径，-l用于指定库的名称（不包括lib前缀和.a、.dll或.so后缀，我相信带有前缀的版本也可以工作）。
因此，应该写成LIBS += -L$${PWD}\shared -lCalc。
英文:
In qmake project files LIBS variable uses same cli keys as gcc linker -L to specify searchpath for libraries and -l for library name (without lib prefix and without .a or .dll or .so suffix, I believe version with prefix should also work).
So it should be LIBS += -L$${PWD}\shared -lCalc
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