动态调用winscard.dll里的SCardListReadersA不行，静态就可以。

Question

静态调用就可以，动态调用就不行，动态调用返回6，没有看到关于返回6错误类型。代码如下，麻烦大家帮忙看看什么问题

参开:http://pcsclite.alioth.debian.org/api/group__API.html#ga93b07815789b3cf2629d439ecf20f0d9

LONG  ScardListReaders(SCARDCONTEXT hContext, 
LPSTR mszReader, 
LPDWORD pcchReaders)
{
ULONG status = 0;
HMODULE hModule = LoadLibraryA("winscard.dll");

if (hModule != NULL)
{
FUNADDR  ScardListReaders = (FUNADDR)GetProcAddress(hModule, "SCardListReadersA");

if (ScardListReaders != NULL)
{
status = ScardListReaders(hContext, NULL, NULL, pcchReaders);
//SCardListReaders(hContext, NULL, NULL, pcchReaders);静态调用
LPSTR mszReaders = (LPSTR)malloc(sizeof(char) * (*pcchReaders));
status = ScardListReaders(hContext,
NULL,
mszReaders,
pcchReaders);

char* p = mszReaders;
char* k = mszReader;

for (int i = 0; i < *pcchReaders; i++)
{
if (*p == '\0')
{
*k = '#';
}
else
{
*k = *p;
}

k++;
p++;
}

free(mszReaders);
}
}
else
{
status = -1;
}
FreeLibrary(hModule);

return status;
}

Answer 1

Hi,

感谢在MSDN论坛发帖。

>>静态调用就可以，动态调用就不行，动态调用返回6，没有看到关于返回6错误类型。代码如下，麻烦大家帮忙看看什么问题

错误6指的是ERROR_INVALID_HANDLE。 你可以通过调用SCardEstablishContext来设置正确的Resource manager context.

另外，请检查你的项目属性是unicode类型还是ANSI类型。并检查LoadLibraryA和GetProcAddress的返回值是否正确。

希望对你有所帮助。

Best Regards,

Baron Bi

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