这是什么问题，希望帮忙

[weigogo]

我用c++builder做一个小程序，编译通过了，可是在运行的时间出现了这样的提示
“access violation at 0x400085e1:write of address 0x00030dc4 08 00 04 00 00 8d 44 24 04 50 8b 43”,我不知道是什么，它还提示说要我选择继续run或进入step，那进如step 是怎么回事，怎么进，进去后怎么搞，忘大家帮忙，不盛感激

[weigogo]

[e-mail]
很是感谢

[weigogo]

还有就是我不知道怎么调试，能不能给我介绍点，

[yhz]

To weigogo(伟哥)：
邮件已发。

看来你是初学者吧？调试可是每一个写程序的人必须掌握的基本技术啊！
要调试的话，首先，确定大致的错误范围。然后在这个前面设立断点。
然后运行程序，程序会在那个断点处停下，然后你用单步执行就可以了。
你一边单步执行，一边观察各个变量的值是否都在你的设计之内。

要做到这一点不太容易，尤其是在调试别人的程序的时候。
因为你首先要了解那个算法的工作原理。
尤其像 DES、RSA 这些比较复杂的算法，涉及不少高深的数学原理（我就是高数学不好），
要了解它的原理还是很头痛的。

这些东西就慢慢来吧，一定要自己有点积累，有点经验就行了。

[SCUM]

内存访问出错 代码拿来看看

[tigerhohoo]

按照你的方法试了一下,的确在
m_dwlData >>= 8;的地方发生异常，
而如果使用m_dwlData = mdwlData >> 8 就没问题了，在同样的地方如果对一个临时声明的变量 i 进行操作 i >>= 8; 也没有问题，似乎对于类成员变量不能使用 >>= 这个操作符号，奇怪的问题。

[tigerhohoo]

顶一下,怪怪的问题,希望高手看过来.

[weigogo]

我写的是一个des加密的程序，代码 是网上下的，编译的时候没有错误但会有两个警告
conversion may lose significant digits, 分别指向两个函数，编译出错的地方和运行时有个黄色箭头指的地方我在下面的代码里指出来
#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <conio.h>
#include "Schedle.h"

class CShift{
public:
DWORDLONG mask[16];
int step[16];
CShift(){
for(int i=0;i<16;i++){
step[i]=2;
mask[i]=0xc000000;
}
step[0]=step[1]=step[8]=step[15]=1;
mask[0]=mask[1]=mask[8]=mask[15]=0x8000000;
}
};

class CDES{

public:

CDES(){
m_dwlKey=0;
m_dwlData=0;
ConvertTableToMask(dwlKey_PC_1,64);
//PrintTable(dwlKey_PC_1,7,8);
ConvertTableToMask(dwlKey_PC_2,56);
ConvertTableToMask(dwlData_IP,64);
ConvertTableToMask(dwlData_Expansion,32);
ConvertTableToMask(dwlData_FP,64);
ConvertTableToMask(dwlData_P,32);
Generate_S();

}
void PrintBit(DWORDLONG);
void EncryptKey(char *);
unsigned char* EncryptData(unsigned char *);
unsigned char* DescryptData(unsigned char*);

private:
void ConvertTableToMask(DWORDLONG *,int);
void Generate_S(void);
void PrintTable(DWORDLONG*,int,int);
DWORDLONG ProcessByte(unsigned char*,BOOL);
DWORDLONG PermuteTable(DWORDLONG,DWORDLONG*,int);
void Generate_K(void);
void EncryptKernel(void);
DWORDLONG Generate_B(DWORDLONG,DWORDLONG*);
/*For verify schedule permutation only*/
DWORDLONG UnPermuteTable(DWORDLONG,DWORDLONG*,int);
/**************************************/
DWORDLONG dwlData_S[9][4][16];
CShift m_shift;
DWORDLONG m_dwlKey;
DWORDLONG m_dwlData;
DWORDLONG m_dwl_K[17];
};

void CDES::EncryptKey(char *key){

printf("\nOriginal Key: %s",key);
m_dwlKey=ProcessByte((unsigned char*)key,TRUE);
// PrintBit(m_dwlKey);
m_dwlKey=PermuteTable(m_dwlKey,dwlKey_PC_1,56);
// PrintBit(m_dwlKey);
Generate_K();
// printf("\n******************************************\n");
}

void CDES::Generate_K(void){

DWORDLONG C[17],D[17],tmp;

C[0]=m_dwlKey>>28;
D[0]=m_dwlKey&0xfffffff;

for(int i=1;i<=16;i++){
tmp=(C[i-1]&m_shift.mask[i-1])>>(28-m_shift.step[i-1]);
C[i]=((C[i-1]<<m_shift.step[i-1])|tmp)&0x0fffffff;
tmp=(D[i-1]&m_shift.mask[i-1])>>(28-m_shift.step[i-1]);
D[i]=((D[i-1]<<m_shift.step[i-1])|tmp)&0x0fffffff;
m_dwl_K[i]=(C[i]<<28)|D[i];
m_dwl_K[i]=PermuteTable(m_dwl_K[i],dwlKey_PC_2,48);
}
}

[weigogo]

DWORDLONG CDES::ProcessByte(unsigned char *key,BOOL shift){

unsigned char tmp;
DWORDLONG byte=0;
int i=0;

while(i<8){
while(*key){
if(byte!=0)
byte<<=8;
tmp=*key;
if(shift)
tmp<<=1;
byte|=tmp;
i++;
key++;
}
if(i<8)
byte<<=8;
i++;
}
return byte;
}

DWORDLONG CDES::PermuteTable(DWORDLONG dwlPara,DWORDLONG* dwlTable,int nDestLen){

int i=0;
DWORDLONG tmp=0,moveBit;

while(i<nDestLen){
moveBit=1;
if(dwlTable[i]&dwlPara){
moveBit<<=nDestLen-i-1;
tmp|=moveBit;
}
i++;
}
return tmp;
}

DWORDLONG CDES::UnPermuteTable(DWORDLONG dwlPara,DWORDLONG* dwlTable,int nDestLen){

DWORDLONG tmp=0;
int i=nDestLen-1;

while(dwlPara!=0){
if(dwlPara&0x01)
tmp|=dwlTable[i];
dwlPara>>=1;
i--;
}
return tmp;
}

void CDES::PrintTable(DWORDLONG *dwlPara,int col,int row){

int i,j;
for(i=0;i<row;i++){
printf("\n");
getch();
for(j=0;j<col;j++)
PrintBit(dwlPara[i*col+j]);
}
}

void CDES::PrintBit(DWORDLONG bitstream){

char out[76];
int i=0,j=0,space=0;

while(bitstream!=0){
if(bitstream&0x01)
out[i++]='1';
else
out[i++]='0';
j++;
if(j%8==0){
out[i++]=' ';
space++;
}

bitstream=bitstream>>1;
}
out[i]='\0';
strcpy(out,strrev(out));
printf("%s **:%d\n",out,i-space);
}

void CDES::ConvertTableToMask(DWORDLONG *mask,int max){

int i=0;
DWORDLONG nBit=1;

while(mask[i]!=0){
nBit=1;
nBit<<=max-mask[i];
mask[i++]=nBit;
}
}

void CDES::Generate_S(void){

int i;
int j,m,n;
m=n=0;
j=1;

for(i=0;i<512;i++){
dwlData_S[j][m][n]=OS[i];
n=(n+1)%16;
if(!n){
m=(m+1)%4;
if(!m)
j++;
}
}
}

unsigned char * CDES::EncryptData(unsigned char *block){

unsigned char *EncrytedData=new unsigned char(15);

printf("\nOriginal Data: %s\n",block);
m_dwlData=ProcessByte(block,0);
// PrintBit(m_dwlData);
m_dwlData=PermuteTable(m_dwlData,dwlData_IP,64);
EncryptKernel();
// PrintBit(m_dwlData);
DWORDLONG bit6=m_dwlData;
for(int i=0;i<11;i++){
EncrytedData[7-i]=(unsigned char)(bit6&0x3f)+46;这一行有警告！
bit6>>=6;
}
EncrytedData[11]='\0';
printf("\nAfter Encrypted: %s",EncrytedData);

for(i=0;i<8;i++){
EncrytedData[7-i]=(unsigned char)(m_dwlData&0xff);
m_dwlData>>=8;箭头指在这里！！！！
}
EncrytedData[8]='\0';


return EncrytedData;
}

void CDES::EncryptKernel(void){

int i=1;

DWORDLONG L[17],R[17],B[9],EK,PSB;
L[0]=m_dwlData>>32;
R[0]=m_dwlData&0xffffffff;

for(i=1;i<=16;i++){
L[i]=R[i-1];
R[i-1]=PermuteTable(R[i-1],dwlData_Expansion,48); //Expansion R
EK=R[i-1]^m_dwl_K[i]; //E Permutation
PSB=Generate_B(EK,B); //P Permutation
R[i]=L[i-1]^PSB;
}

R[16]<<=32;
m_dwlData=R[16]|L[16];
m_dwlData=PermuteTable(m_dwlData,dwlData_FP,64);
}

unsigned char* CDES::DescryptData(unsigned char *desData){

int i=1;
unsigned char *DescryptedData=new unsigned char(15);
DWORDLONG L[17],R[17],B[9],EK,PSB;
DWORDLONG dataPara;

dataPara=ProcessByte(desData,0);
dataPara=PermuteTable(dataPara,dwlData_IP,64);

R[16]=dataPara>>32;
L[16]=dataPara&0xffffffff;

for(i=16;i>=1;i--){
R[i-1]=L[i];
L[i]=PermuteTable(L[i],dwlData_Expansion,48); //Expansion L
EK=L[i]^m_dwl_K[i]; //E Permutation
PSB=Generate_B(EK,B); //P Permutation
L[i-1]=R[i]^PSB;
}

L[0]<<=32;
dataPara=L[0]|R[0];
dataPara=PermuteTable(dataPara,dwlData_FP,64);

// PrintBit(dataPara);

for(i=0;i<8;i++){
DescryptedData[7-i]=(unsigned char)(dataPara&0xff);
dataPara>>=8;
}
DescryptedData[8]='\0';
printf("\nAfter Decrypted: %s\n",DescryptedData);

return DescryptedData;
}

DWORDLONG CDES::Generate_B(DWORDLONG EKPara,DWORDLONG *block){

int i,m,n;
DWORDLONG tmp=0;

for(i=8;i>0;i--){
block[i]=EKPara&0x3f;
m=(int)(block[i]&0x20)>>4;
m|=block[i]&0x01; 这行也有警告！
n=(int)(block[i]<<1)>>2;
block[i]=dwlData_S[i][m][n];
EKPara>>=6;
}

for(i=1;i<=8;i++){
tmp|=block[i];
tmp<<=4;
}
tmp>>=4;
tmp=PermuteTable(tmp,dwlData_P,32);

return tmp;
}

void main(void){

CDES des;
des.EncryptKey("12345678");
unsigned char *result=des.EncryptData((unsigned char*)"DemoData");
des.DescryptData(result);
}

[weigogo]

这里是头文件
#include <windows.h>

DWORDLONG dwlKey_PC_1[64]={
57,49,41,33,25,17,9,
1,58,50,42,34,26,18,
10,2,59,51,43,35,27,
19,11,3,60,52,44,36,
63,55,47,39,31,23,15,
7,62,54,46,38,30,22,
14,6,61,53,45,37,29,
21,13,5,28,20,12,4,0};置换选择1

DWORDLONG dwlKey_PC_2[64]={
14,17,11,24,1,5,
3,28,15,6,21,10,
23,19,12,4,26,8,
16,7,27,20,13,2,
41,52,31,37,47,55,
30,40,51,45,33,48,
44,49,39,56,34,53,
46,42,50,36,29,32,0};//置换选择2

DWORDLONG dwlData_IP[65]={
58,50,42,34,26,18,10,2,
60,52,44,36,28,20,12,4,
62,54,46,38,30,22,14,6,
64,56,48,40,32,24,16,8,
57,49,41,33,25,17,9,1,
59,51,43,35,27,19,11,3,
61,53,45,37,29,21,13,5,
63,55,47,39,31,23,15,7,0};//IP置换

DWORDLONG dwlData_Expansion[64]={
32,1,2,3,4,5,
4,5,6,7,8,9,
8,9,10,11,12,13,
12,13,14,15,16,17,
16,17,18,19,20,21,
20,21,22,23,24,25,
24,25,26,27,28,29,
28,29,30,31,32,1,0};//选择运算E


DWORDLONG dwlData_P[33]={
16,7,20,21,
29,12,28,17,
1,15,23,26,
5,18,31,10,
2,8,24,14,
32,27,3,9,
19,13,30,6,
22,11,4,25,0};置换运算P

DWORDLONG dwlData_FP[65]={
40,8,48,16,56,24,64,32,
39,7,47,15,55,23,63,31,
38,6,46,14,54,22,62,30,
37,5,45,13,53,21,61,29,
36,4,44,12,52,20,60,28,
35,3,43,11,51,19,59,27,
34,2,42,10,50,18,58,26,
33,1,41,9,49,17,57,25,0};

DWORDLONG OS[512]={
14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,
0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8,
4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0,
15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13,

15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,
3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5,
0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15,
13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9,

10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,
13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,
13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7,
1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12,

7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,
13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9,
10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4,
3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14,

2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,
14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6,
4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14,
11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3,

12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,
10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8,
9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6,
4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13,

4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,
13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6,
1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,
6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12,

13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,
1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2,
7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,
2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11
};
运行出错信息：
Project DesP.exe raised exception class EAccessviolation with message 'Access violation at address 00401C47 in module"DesP.exe",Write of address 378C66C1',
Process stopped.Use Step or Run to continue

[yjy1001]

初学 就来搞这么难的？！
无法理解—……%#·

[huangjuliang]

好长的代码呀！

[yhz]

太长了。而且不要以为网上下载的就一定没有错，这些调试工作应该是由你自己完成的。

这样吧，就下邮箱，我发一份我自己写的给你。

[weigogo]

是我们老师布置的作业，不做没办法的

[blankman]

学着调试吧，无论什么行业都要掌握的东东

[czxwm]

u are hard.
u must program a MD5.

[weigogo]

还有就是我用builder做打开文件的界面时老是说打开文件出错
我就在窗体上加了一个OpenDialog，一个Edit，用与显示文件路径，两个Button，一个用与
激活打开文件对话筐，一个用于确定，加的代码如下

void __fastcall TForm1::SpeedButton1Click(TObject *Sender)
{
if(OpenDialog1->Execute())
Edit1->Text=OpenDialog1->FileName;
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{

fp=fopen("OpenDialog1->FileName","r");
if(fp==NULL)
{MssageBox(NULeL," 打开文件错","提示",MB_OK);
return;}
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Edit1Change(TObject *Sender)
{

}
//---------------------------------------------------------------------------

void __fastcall TForm1::OpenDialog1CanClose(TObject *Sender,
bool &CanClose)
{

}
//---------------------------------------------------------------------------
不知道为什么总是打开不成功