未处理的异常:访问冲突错误 [英] Unhandled Exception:Access Violation Error

问题描述

大家好，

正在创建MFC DLL&收到错误:Key_Testing.exe中0x00000000的未处理异常:0xC0000005:访问冲突.

DLL代码如下:

Hello Everyone,

Am working creating MFC DLL & am getting an error:Unhandled exception at 0x00000000 in Key_Testing.exe: 0xC0000005: Access violation.

The DLL Code is like this:

//Demo.h
char*	GetDiskSerialNumber (char g_DiskLetter);

//Demo.cpp
char* DLLclass::GetDiskSerialNumber(char g_DiskLetter)
{
	CHAR SN[64];
	memset(SN,0,sizeof(SN));
		
	if(GetSerialNumber(SN,g_DiskLetter)){   // Error in this Line..
		return (char*)SN;
	}
}

This DLL am using in an application..
void CKey_TestingDlg::OnBnClickedgetserial()
{
	// TODO: Add your control notification handler code here
	DLLclass Dllobj;
	char ltr='h';
	char* ser=Dllobj.GetDiskSerialNumber(ltr);
}

请，任何人都可以建议我哪里出了问题..任何帮助都会得到应用..

谢谢.

Please,, Could anyone suggest where i gone wrong.. Any help will be appriciated..

Thank you.

推荐答案

GetSerialNumber中的代码是什么?
那里可能有一些错误.

另外，您还要声明一个本地数组并返回其地址，当该函数返回时，该地址将不再有效.

而是按如下所示更改它-

What is the code inside GetSerialNumber?
There is probably some error there.

Also, you''re declaring a local array and returning its address, which will no longer be valid when the function returns.

Instead change it as follows -

void DLLclass::GetDiskSerialNumber(char g_DiskLetter, char* SN)
{
	GetSerialNumber(SN, g_DiskLetter);
}
 
void CKey_TestingDlg::OnBnClickedgetserial()
{
	// TODO: Add your control notification handler code here
	DLLclass Dllobj;
	char ltr=''h'';

	CHAR SN[64];
	memset(SN,0,sizeof(SN));

	Dllobj.GetDiskSerialNumber(ltr, SN);
}

GetDiskSerialNumber 正在返回指向本地数组的指针.这是无效的.当函数退出并驻留在堆栈中时，局部变量将死亡.

GetDiskSerialNumber is returning a pointer to a local array. This is not valid. Local variables die when the function exits as they reside on the stack.

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