subject_29499.htm

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序号：29499 发表者：Jenny Han 发表日期：2003-02-08 21:28:02
<br>主题：关于api动态库加载的问题，请教各位高手
<br>内容：本人初学VC，向各位高手请教一个有关API动态库使用的问题，恳请各位给予解答，谢谢。<BR>我在VC平台上建立一个空的控制台项目，往项目中加入一个C++源文件，C++源文件的内容是MSDN（Visual Studio 6.0自带）里CryptSignAndEncodeCertificate函数的示例程序：<BR><BR>#include &lt;stdio.h&gt;<BR>#include &lt;windows.h&gt;<BR>#include "wincrypt.h"<BR>#define CERT_SUBJECT_NAME "Elizabeth Jackson"<BR>#define MY_ENCODING_TYPE&nbsp;&nbsp;(PKCS_7_ASN_ENCODING | X509_ASN_ENCODING)<BR>void BytesToStr(DWORD cb, void* pv, LPSTR sz);<BR>void main(void)<BR>{<BR>&nbsp;&nbsp;CERT_RDN_ATTR rgNameAttr[] = {"2.5.4.3",CERT_RDN_PRINTABLE_STRING,dwValueType strlen(CERT_SUBJECT_NAME), (BYTE*)CERT_SUBJECT_NAME}; <BR>……<BR>}<BR>void BytesToStr(DWORD cb, void* pv, LPSTR sz)<BR>{<BR>&nbsp;&nbsp;……<BR>}<BR><BR>然后把头文件wincrypt.h拷贝到项目目录中,在project/setting/link/project option中添加”Crypt32.lib”,然后把头文件wincrypt.h加入项目工作区,随后运行,出现一系列类似错误：<BR>D:\2.cpp(17) : error C2065: 'CERT_RDN_ATTR' : undeclared identifier<BR>D:\2.cpp(17) : error C2146: syntax error : missing ';' before identifier 'rgNameAttr'<BR>D:\2.cpp(17) : error C2065: 'rgNameAttr' : undeclared identifier<BR>D:\2.cpp(17) : error C2059: syntax error : ']'<BR>D:\2.cpp(17) : error C2143: syntax error : missing ';' before '{'<BR>D:\2.cpp(18) : error C2065: 'CERT_RDN_PRINTABLE_STRING' : undeclared identifier<BR>……<BR>2.exe - 62 error(s), 1 warning(s)<BR><BR>“CERT_RDN_ATTR”、 “rgNameAttr”、“CERT_RDN_PRINTABLE_STRING”等在wincrypt.h中已声明，为什么还出现“undeclared identifier”错误？ 随后的“syntax error”也是由“undeclared identifier”类错误引起的。<BR>
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回复者：tjhe 回复日期：2003-02-08 23:28:53
<br>内容：#include &lt;wincrypt.h&gt;&nbsp;&nbsp; //不应该是#include "wincrypt.h"，否则搜索路径不对<BR>
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回复者：Jenny Han 回复日期：2003-02-09 10:57:21
<br>内容：我是过了，不是#include "wincrypt.h"方面的原因。
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<font color=red>答案被接受</font><br>回复者：tjhe 回复日期：2003-02-09 12:05:50
<br>内容：#define _WIN32_WINNT 0x0400&nbsp;&nbsp; //加上此句试试<BR>#include &lt;windows.h&gt;<BR>#include "wincrypt.h"<BR>
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回复者：freeflying 回复日期：2003-02-19 12:33:56
<br>内容：加上#define _WIN32_WINNT 0x0400后，出现下边的错误<BR>ompiling...<BR>CryptSignAndEncodeCertificate.c<BR>D:\VCProject\C\CryptSignAndEncodeCertificate.c(171) : warning C4047: 'function' : 'unsigned long ' differs in levels of indirection from 'void *'<BR>D:\VCProject\C\CryptSignAndEncodeCertificate.c(171) : warning C4024: 'CryptAcquireContextA' : different types for formal and actual parameter 5<BR>D:\VCProject\C\CryptSignAndEncodeCertificate.c(305) : error C2065: 'new' : undeclared identifier<BR>D:\VCProject\C\CryptSignAndEncodeCertificate.c(305) : warning C4047: '=' : 'char *' differs in levels of indirection from 'int '<BR>D:\VCProject\C\CryptSignAndEncodeCertificate.c(305) : error C2143: syntax error : missing ';' before 'type'<BR>Error executing cl.exe.<BR><BR>CryptSignAndEncodeCertificate.exe - 2 error(s), 3 warning(s)<BR>该怎么处理？？？<BR><BR>
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回复者：tjhe 回复日期：2003-02-19 13:42:16
<br>内容：改成CryptSignAndEncodeCertificate.cpp试试<BR>
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回复者：freeflying 回复日期：2003-02-20 09:56:28
<br>内容：CryptSignAndEncodeCertificate.cpp<BR>Linking...<BR>CryptSignAndEncodeCertificate.obj : error LNK2001: unresolved external symbol __imp__CryptSignAndEncodeCertificate@36<BR>CryptSignAndEncodeCertificate.obj : error LNK2001: unresolved external symbol __imp__CryptExportPublicKeyInfo@20<BR>CryptSignAndEncodeCertificate.obj : error LNK2001: unresolved external symbol __imp__CryptEncodeObject@20<BR>Debug/CryptSignAndEncodeCertificate.exe : fatal error LNK1120: 3 unresolved externals<BR>Error executing link.exe.<BR><BR>CryptSignAndEncodeCertificate.exe - 4 error(s), 0 warning(s)<BR>？？？？？？？？？？？？？？<BR>
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