谁能帮我改正错误,最好给个例子!两天没搞定了!

[wdllove]

做dll传参数出错!
这是dll的!
extern "C" __declspec(dllexport) void Show(CString aa)
{

AfxMessageBox(aa);
}
这是调用!
void CTestDlg::OnOK()
{
// TODO: Add extra validation here
typedef void (WINAPI * TESTDLL)(CString aa);
HINSTANCE hmod;
hmod = ::LoadLibrary ("mfcdll.dll");
if(hmod==NULL)
{
AfxMessageBox("Fail");
}
TESTDLL lpproc;
CString aa="bb";
lpproc = (TESTDLL)GetProcAddress (hmod,"Show");
if(lpproc!=(TESTDLL)NULL)
(*lpproc)(aa);

FreeLibrary(hmod);

}

能调用dll 显示出来对话框!
但debug 的出现一个提示框
Program: D:\TESTDLL\test\Debug\test.exe
Module:
File: i386\chkesp.c
Line: 42

The value of ESP was not properly saved across a function call.
This is usually a result of calling a function declared with one
calling convention with a function pointer declared with a different calling convention.

(Press Retry to debug the application)

而release的则自动关闭窗口


我想还是传的参数不能为cstring,或者类型不对,实在找不到问题了!:(

[wdllove]

谢谢各位!
to flyelf(空谷清音) ( )
extern "C" __declspec(dllexport) void Show(LPCTSTR lpszMsg)
{
AfxMessageBox(lpszMsg);
}
void CTestDlg::OnOK()
{
// TODO: Add extra validation here

typedef void (WINAPI * TESTDLL)(LPCTSTR);
HINSTANCE hmod;
hmod = ::LoadLibrary ("mfcdll.dll");
if(hmod==NULL)
{
AfxMessageBox("Fail");
}
TESTDLL lpproc;
lpproc = (TESTDLL)GetProcAddress(hmod,"Show");
CString aa="345";
if(lpproc!=(TESTDLL)NULL)
{
(*lpproc)(aa);
}

FreeLibrary(hmod);

}

这样错误提示依然是那样!

to akiko(弥弥) ( )
我不太明白你的意思!

现在dll端能编译通过但调用不了!

[wdllove]

---------------------------
Microsoft Visual C++ Debug Library
---------------------------
Debug Error!

Program: G:\vc_study\vcDlgDLL\Test\Debug\Test.exe
Module:
File: i386\chkesp.c
Line: 42

The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.

(Press Retry to debug the application)
---------------------------
终止(A) 重试(R) 忽略(I)
---------------------------

[arvid_gs]

extern "C" __declspec(dllexport) void Show(CString &aa)
{

AfxMessageBox(aa);
}

[akiko]

等一下，导出的函数原型是，默认的应该是cdecl调用约定吧，
extern "C" __declspec(dllexport) void Show(CString aa)
而你的代码中，有WINAPI，这样调用约定不用，可以编译通过吗？
typedef void (WINAPI * TESTDLL)(CString aa);

[wdllove]

不行
---------------------------
Test: Test.exe - 应用程序错误
---------------------------
"0x77df4af8" 指令引用的 "0x00353433" 内存。该内存不能为 "read"。


要终止程序，请单击“确定”。
要调试程序，请单击“取消”。
---------------------------
确定 取消
---------------------------

[flyelf]

void WINAPI Show(LPCTSTR lpszMsg)
{
AfxMessageBox(lpszMsg);
}

void CTestDlg::OnOK()
{
// TODO: Add extra validation here
typedef void (WINAPI * TESTDLL)(LPCTSTR);
HINSTANCE hmod;
hmod = ::LoadLibrary ("mfcdll.dll");
if(hmod==NULL)
{
AfxMessageBox("Fail");
}
TESTDLL lpproc;
CString aa="bb";
lpproc = (TESTDLL)GetProcAddress (hmod,"Show");
if(lpproc!=(TESTDLL)NULL)
lpproc(aa);

FreeLibrary(hmod);

}

[双杯献酒]

GZ

[pxwzd123]

up