Win32程序卡死在循环里

Question

#include <windows.h>
#include <stdio.h>
#include <tlhelp32.h>
#include <string.h>
#include <psapi.h>

WINAPI int WinMain(HINSTANCE hInstance, HINSTANCE hPreInstacne, LPSTR lpCmdLine, int nCmdShow)
{
    HANDLE pHandle = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0);
    PROCESSENTRY32 process32;
    process32.dwSize = sizeof(process32);
    BOOL bReturn = Process32First(pHandle,&process32); 
    wchar_t* dest;
    int srcSize = strlen(lpCmdLine);
    dest = (wchar_t*)malloc((srcSize+1)*2);
    memset(dest,0,(srcSize+1)*2);
    mbstowcs(dest,lpCmdLine,srcSize); 
    *(dest+srcSize) = L'\0'; //dest = L"Twinkstar.exe"
    while(bReturn)
    { 
        if(!wcscmp(dest,(wchar_t*)process32.szExeFile))
        {
            LPSTR path = (LPSTR)malloc(256);
            memset(path,0,256);
            HANDLE process = OpenProcess(PROCESS_ALL_ACCESS ,FALSE,process32.th32ProcessID);
            GetModuleFileNameExA(process,NULL,path,sizeof(path));
            printf("%s",path);
            free(path);
            path = NULL;
            break;
        }
        Process32Next(pHandle,&process32);
    }
    free(dest);
    dest = NULL;
}
    

• 需求：编写一个程序，传入进程名字，输出进程所在路径

• 问题：程序运行后卡死

• 打开GDB调试:
• 传入参数 Twinkstar.exe:
  

  

• 第17行下断点:
  

  

  
  

  

• 第17行dest = L""
  

  

• 步进，第18行dest="Twinkstar.exe"
• dest成功接收了lpCmdLine的值传递
  

  

• 继续运行,GDB直接卡死，推测问题就在循环里
  

  

Answer 1

程序问题比较多，主要是字符串转换错误，字符串比较不一致就会陷入死循环，做了修改，参考一下：
运行参数指定为"winlogon.exe"试一下：

int WINAPI  WinMain(HINSTANCE hInstance, HINSTANCE hPreInstacne, LPSTR lpCmdLine, int nCmdShow)
{
    HANDLE pHandle = CreateToolhelp32Snapshot(TH32CS_SNAPALL, 0);
    PROCESSENTRY32 process32;
    process32.dwSize = sizeof(process32);
    BOOL bReturn = Process32First(pHandle, &process32);
    char* dest;
    int srcSize = strlen(lpCmdLine);
    dest = (char*)malloc(srcSize + 1);
    memset(dest, 0, srcSize + 1);
    strcpy(dest, lpCmdLine);
    *(dest + srcSize) = L'\0'; //dest = L"Twinkstar.exe"
    while (bReturn)
    {
        if (!strcmp(dest, process32.szExeFile))
        {
            LPSTR path = (LPSTR)malloc(256);
            memset(path, 0, 256);
            HANDLE process = OpenProcess(PROCESS_ALL_ACCESS, FALSE, process32.th32ProcessID);
            int nErr = GetLastError();
            GetModuleFileNameExA(process, NULL, path, 256);
            printf("%s", path);
            free(path);
            path = NULL;
            break;
        }
        Process32Next(pHandle, &process32);
    }
    free(dest);
    dest = NULL;
}