各位老师，C++读取内存字符串数据出错？

jtwc · 发表于 2022-5-27 19:06

本帖最后由 jtwc 于 2022-5-27 19:18 编辑

各位老师，C++读取内存字符串数据出错？如何改呢？谢谢了
代码如下：
char dwsunshineAddressValue = 0;
if (FALSE == ReadProcessMemory(hProcess, (void*)0x11D17D61, &dwsunshineAddressValue, sizeof(char), NULL))

            {
                     //printf("读取静态地址.\n");

            }
char a[] = { dwsunshineAddressValue };
printf(“%s\n", a);

unmask · 发表于 2022-5-27 19:20

本帖最后由 unmask 于 2022-5-27 19:22 编辑

你只声明了一位char，并且也只读取了一位char，所以请打印char：printf(“%c\n", a)，打印string会出现越界乱码现象。
或者读取6位字符：ReadProcessMemory(hProcess, (void*)0x11D17D61, &dwsunshineAddressValue, 6, NULL)，可是可能会内存越界，因为你的栈目前只有一位char是合法的。

jtwc · 发表于 2022-5-27 19:22

unmask 发表于 2022-5-27 19:20
你只声明了一位char，并且也只读取了一位char，所以请打印char：printf(“%c\n", a)，打印string会出现越界 ...

老师，也出错，谢谢了

unmask · 发表于 2022-5-27 19:37

jtwc 发表于 2022-5-27 19:22
老师，也出错，谢谢了

printf(“%c\n", a[0])

sam喵喵 · 发表于 2022-5-27 19:39

把char a[]改成char* a试试

jtwc · 发表于 2022-5-27 19:41

unmask 发表于 2022-5-27 19:37
printf(“%c\n", a[0])

老师，这样只能输出1位，要输出整个字符串，谢谢了

jtwc · 发表于 2022-5-27 19:44

sam喵喵发表于 2022-5-27 19:39
把char a[]改成char* a试试

老师，试过了，不行，谢谢了

wangyujie96 · 发表于 2022-5-27 19:48

BOOL ReadProcessMemory(
  [in]  HANDLE  hProcess,
  [in]  LPCVOID lpBaseAddress,
  [out] LPVOID  lpBuffer,
  [in]  SIZE_T  nSize,
  [out] SIZE_T  *lpNumberOfBytesRead
);
Parameters
[in] hProcessA handle to the process with memory that is being read. The handle must have PROCESS_VM_READ access to the process.
[in] lpBaseAddressA pointer to the base address in the specified process from which to read. Before any data transfer occurs, the system verifies that all data in the base address and memory of the specified size is accessible for read access, and if it is not accessible the function fails.
[out] lpBufferA pointer to a buffer that receives the contents from the address space of the specified process.
[in] nSizeThe number of bytes to be read from the specified process.
[out] lpNumberOfBytesReadA pointer to a variable that receives the number of bytes transferred into the specified buffer. If lpNumberOfBytesRead is NULL, the parameter is ignored.

unmask · 发表于 2022-5-27 19:49

jtwc 发表于 2022-5-27 19:41
老师，这样只能输出1位，要输出整个字符串，谢谢了

[C++] 纯文本查看 复制代码

int main(int argc, char const *argv[])
{
    char dwsunshineAddressValue[7] = {0};
    if (FALSE == ReadProcessMemory(hProcess, (void *)0x11D17D61, dwsunshineAddressValue, sizeof(dwsunshineAddressValue) - 1, NULL))
    {
        // printf("读取静态地址.\n");
    }
    printf("%s\n", dwsunshineAddressValue);
}

jtwc · 发表于 2022-5-27 19:54

unmask 发表于 2022-5-27 19:49
[mw_shl_code=cpp,true]int main(int argc, char const *argv[])
{
char dwsunshineAddressValue[7 ...

老师，非常正确，谢谢了

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