h20000127-25.htm

对于学习很有帮助

    <p>　　二、使用DLL</p>
    <p>　　在BCB中使用DLL有两种方法：</p>
    <p>　　1．用静态调用法</p>
    <p>　　首先需要在BCB的项目中加入输入接口库(import library)，打开工程项目，使用BCB 
    View|Project Manager打开项目列表，向项目中加入接口库(＊.lib)。</p>
    <p>　　其次在头文件中加入接口声明。</p>
    <p>　　例程序如下：</p>
    <p>　　 //define in include file</p>
    <p>　　extern 揅?__declspec(dllimport) int __cdecl test();</p>
    <p>　　//use function in main program</p>
    <p>　　int I；</p>
    <p>　　I=test();</p>
    <p>　　注意：</p>
    <p>　　(1)动态链接库调用过程、函数时CALL方式 
    与创建时方式一样不写为__cdecl，其它需要声明。</p>
    <p>　　(2)BCB创建的DLL有对应的输入接口库(import library)，如只有DLL而无库时，可用BCB的implib工具产生：implib 
    xxx.lib xxx.dll；另外可用：tlib xxx.lib,xxx.lst 产生DLL的内部函数列表，许多Windows的未公开技术就是用这种方法发现的。</p>
    <p>　　2．动态调用法</p>
    <p>　　动态调用法要用Windows API 中的LoadLibrary()和GetProcAddress()来调入DLL库，指出库中函数位置，这种方法较常见。</p>
    <p>　　例程序如下：</p>
    <p>　　 HINSTANCE dd;</p>
    <p>　　 int _stdcall (＊ddd)(void);</p>
    <p>　　 dd=LoadLibrary(搙xx.dll?;</p>
    <p>　　 ddd=GetProcAddress(dd,搕est?;</p>
    <p>　　 Caption=IntToStr(ddd());</p>
    <p>　　FreeLibrary(dd);</p>
    <p>　　三、注意：</p>
    <p>　　创建DLL时编译链接时注意设置Project Options。</p>
    <p>　　Packages标签：去除Builder with runtime packages检查框。</p>
    <p>　　Linker标签：去除Use dynamic RTL检查框。</p>
    <p>　　否则创建的DLL需要Runtime packages or Runtime library。</p>
    <p>　　</p>
    <p>　</p>
    <p></font>　</td>
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