這種技術常用在遠程控制軟件中，我們已有遠程控制軟件的服務器端。我們利用遠程控制軟件的客戶端配置生成我們自己的服務端軟件，實現服務器端的端口及IP地址更新的功能。

下邊看源代碼

#include <stdio.h>

include <Windows.h>
int FindStr(char destStr, char srcStr, int destStrLen, int srcStrLen);
void ReplaceStr(char destStr, char  srcStr, int beginPoint);
int main()
{
FILE pReadFile;
FILE pOutFile;
char *pFileBuf;
//打開我們要修改的源程序
if ((pReadFile = fopen("../custom/TestPE.exe", "rb")) == NULL)
{
printf("It's failure to open the readable file\n");
return -1;
}
//我們要生成的源程序
if ((pOutFile = fopen("../custom/TestPE1.exe", "wb")) == NULL)
{
printf("It's failure to open the writable file\n");
return -1;
}
fseek(pReadFile, 0L, SEEK_END);
int fileLen = ftell(pReadFile);
pFileBuf = (char *)malloc(fileLen + 1);
if (pFileBuf == NULL)
{
fclose(pReadFile);
return -1;
}
fseek(pReadFile,0L,SEEK_SET);
fread(pFileBuf, fileLen, sizeof(char), pReadFile);
pFileBuf[fileLen] = '\0';
//我們要修改成的字符串
char modifyStr = "BBBBBBBBB";
//源程序中的字符串
char findStr = "AAAAAAAAAAAAAAA";
int beginPoint;
//我們在讀取的源程序數組中查找我們要查找的字符串的起始位置
beginPoint = FindStr(pFileBuf, findStr, fileLen, 0);
if (beginPoint == -1)
{
printf("It's failure to find the string\n");
return -1;
}
//替換我們的字符串
ReplaceStr(pFileBuf, modifyStr, beginPoint);
//生成我們修改后的源程序
fwrite(pFileBuf, fileLen, sizeof(char), pOutFile);
fclose(pReadFile);
fclose(pOutFile);
if (pFileBuf != NULL)
{
free(pFileBuf);
pFileBuf = NULL;
}
return 0;
}
int FindStr(char destStr, char srcStr, int destStrLen, int srcStrLen)
{
int i,j,findStrLen;
if (srcStrLen == 0)
{
findStrLen = strlen(srcStr);
}
else
{
findStrLen = srcStrLen;
}
for (i = 0; i < destStrLen; i++)
{
for (j = 0; j < findStrLen; j++)
{
if (destStr[i + j] != srcStr[j])
{
break;
}
}
if (j == findStrLen)
{
return i;
}
}
return -1;
}
void ReplaceStr(char destStr, char srcStr, int beginPoint)
{
int srcStrLen, i;
srcStrLen = strlen(srcStr);
for (i = 0; i < srcStrLen; i++)
{
destStr[beginPoint + i] = srcStr[i];
}
destStr[beginPoint + srcStrLen] = '\0';
}</pre>來自：http://blog.csdn.net/u012554768/article/details/39396117